How To Adjust Tankless Water Heater Temperature

How to Change the Temperature on Your Tankless Water Heater

If you’re wanting to save money while also reducing your environmental impact, a tankless water heater may be the solution for you. A tankless water heater, in contrast to a standard storage heater, heats your water on demand rather than continuously heating it. A storage water heater, on the other hand, warms gallons of water at a time and then keeps it hot until you need it, which means the lengthy hot shower you enjoy will cost you more in both energy and money than you expect. It is a wise investment, both financially and ecologically, to get a tankless water heater, but only if you know how to utilize it properly.

Find Out What Kind of Personality You Have The method you use to regulate your tankless water heater is determined on the type of water heater you have installed in your home.

Additionally, there are point-of-use (POU) devices that heat water just before it departs the sink faucet, shower head, or bathtub faucet, saving energy by heating water at the last minute.

Each tankless water heater or point-of-use device is equipped with an LED display that allows you to set the required temperature.

  • Rather from adjusting the temperature using a dial control that is less exact, you may change the temperature degree by degree.
  • Altering the vent settings that are associated with your tankless water heater is another option.
  • For example, if you haven’t switched on your hot water in a while, the system will clean off vapors that can grow dangerously high in concentration.
  • It is a simple, efficient, and reasonably priced equipment.
  • Contact us now for a free estimate.

Adjusting A Tankless Water Heater

A tankless water heater may be adjusted by simply pressing a button on the control panel.

While modern technologies enable you to operate your heating system in a simple, computer-controlled manner, you may need to modify your power supply in order to suit the new heater system.

Temperature Adjustment

Tankless water heater systems can be divided into two categories: large household units that provide on-demand heated water to the entire building when a faucet is opened, and POU (point of use devices) that are installed near the delivery point and can be adjusted specifically for required temperature use at that application based on personal temperature requirements. When a device is installed in the master bedroom bathroom, it can be set at a greater temperature than when a device is placed in the bathroom that provides water for small children to wash their hands or shower and bathe.

Using a user panel with an LED readout, each POU has its own temperature control component that can be accessed by pressing a button.

Aside from that, unlike standard storage tank heaters that operate with a dial control, an instantaneous water heater with a computer-controlled thermostat and an LED readout provides the user with the ability to precisely set the temperature – one degree at a time.

Vent Operations

Tankless water heaters, also known as inline or flash hot water heaters, use computerized controls for its venting operations as well, allowing consumers to choose from a variety of pre-installed fan speeds and speeds. It is extremely convenient to have a digital interface since it allows one to quickly and simply modify the fan’s working power to exhaust any dangerous fumes out of the home when no water is required or when the water is turned off for a length of time.

Flow Operations

The amount of water that flows is governed by a gallons per minute equation. Showering, for example, is subject to particular minimum criteria established by code for various uses. Consequently, after investigating the minimal specifications established by your local code, an instant-on tankless system may assist you in ensuring that you never go below that threshold again. They are equipped with flow monitoring sensors that will notify the homeowner if there is a disturbance in the flow of water.

Additionally, by switching various pipework and flow regulators throughout a house that utilizes POUs, flow rates may be kept to a bare minimum as necessary.

With POU tankless water heaters, users may install adjustable water flow devices, which can deliver a stronger shower spray while maintaining a constant temperature throughout the home.

However, once that temperature is reached, a steady supply of needed hot water can result in bathing experiences that are longer and more pleasurable than previously possible.

How to Adjust The Temperature On A Tankless Water Heater

In the event that your heating or air conditioning system requires repair or replacement, we can link you with a dependable and cost-effective specialist in your region. To be really honest, cold showers are fantastic for re-energizing your body when you need it, but they shouldn’t be done on a daily basis. There’s also the aggravating scenario of getting scalded by hot water, which is really unpleasant. Maintaining the proper temperature on your tankless water heater is critical for both your health and your safety on a daily basis.

Why is it essential to have the proper temperature range?

However, even though the most obvious reason for selecting the appropriate temperature is to ensure your safety and comfort, there are other additional factors to consider. As a result of the low temperature, the likelihood of bathing with lukewarm water increases significantly. It is not only possible to contract a cold, but it is also possible to contract a bacterial growth such as Legionnaire’s disease. It is necessary to adjust the water heater at a temperature that does not enable legionella bacteria to flourish.

  • The environment minimizes the likelihood of Legionella and other microbes thriving in the environment.
  • Did you know that water just has to be 150 degrees Fahrenheit hot to cause third-degree burns on a human skin?
  • We should also point you that using your tankless water heater at a high temperature will result in an increase in your power cost.
  • Let us not forget that every home has its own set of characteristics.
  • When the faucet is located far away from the water heater, heat will be wasted, which is especially true if the pipes are not properly insulated.
  • At the end of the day, when it comes to adjusting the temperature on your tankless water heater, common sense should be followed.
  • When it comes to making modifications, it’s advisable to experiment with different temperatures until you have a clear understanding of what works best for your house.

How to adjust the temperature on your tankless water heater?

The most apparent reason for choosing the appropriate temperature is for your own safety and comfort, but there are a variety of additional considerations. Because of the low temperature, there is a good likelihood that you will shower with lukewarm water. Instead of catching a cold, you might acquire a bacterial growth, such as Legionnaire’s disease, which is a serious respiratory infection. It is necessary to adjust the water heater to a temperature that prevents the growth of legionella bacteria.

  1. Legionella and other microbes are less likely to flourish in this environment.
  2. Not many people are aware that hot water may cause third-degree burns if it is just 150 degrees Fahrenheit.
  3. It’s also worth mentioning that using your tankless water heater at a high degree will raise your power cost.
  4. This was only one of the numerous benefits you received from doing so.
  5. Another important consideration is the distance between the faucet and the water heater.
  6. Increase the temperature over the recommended 120 degrees Fahrenheit.

Everything between 120 and 140 degrees Fahrenheit is considered to be OK. When it comes to making modifications, it’s essential to do a few tests until you have a clear understanding of what the optimal temperature for your house should be.

One last recommendation

If you have any doubts about your water heater’s performance, it is best to test it first before making any alterations. To heat up a kitchen sink or bathroom, start by turning on the water and letting it run until it is hot. Simply submerge a thermometer under the water to obtain an accurate reading. We are confident in our ability to link you with a reputable service in your region that can repair, replace, or maintain your heating and air conditioning systems. Why not allow us to locate you a qualified professional?

Tankless Water Heater – Setting the Right Temperature

Your tankless water heater has unexpectedly gone out of service, and you’re stuck with no hot water? You’re in the shower when all of a sudden the warm water is replaced with frigid! You may reach us at 281-302-6710 to get it resolved. It is possible that the temperature setting on your tankless water heater is the source of the problem. In this video, Master Plumber Bryan Graham explains why this occurs and how to correct the problem.

Summary of Setting the Temperature of Your Tankless Water Heater

Occasionally, clients contact us because their tankless water heater is constantly cycling on and off. When we walk outside, we notice that the water heater is set to an excessively high temperature most of time. As a result, many individuals turn the heat up as high as they possibly can, reaching temperatures over 140 degrees. If you have a tankless water heater, that water heater has a flow switch, and you must have a significant amount of water flowing through that water heater for that water heater to activate.

  • For starters, if you have the water heater set to 140 degrees, you are mixing much too much cold water with far too little hot water in order to keep the temperature at the shower head comfortable.
  • It is possible to resolve this issue by turning down the temperature of the water heater.
  • As long as you maintain the temperature about 130 degrees, you won’t have to worry about becoming too hot when taking a shower.
  • The temperature is too high for your home at 140 degrees.
  • You’ll be generating enough flow to turn on that tankless water heater and keep it running during your shower session.
  • After less than an hour, they were at my house to have a check at my hot water heater.

He went out of his way to make sure I had hot water to keep me going till the parts came. I’m so delighted, this is the greatest customer service I’ve ever had!

Lona Howell

Recommendation from Facebook Graham Plumbing Services is certified A+ by the Better Business Bureau of Houston and services consumers in Sugar Land, Missouri City, Katy, and other communities around the greater Houston region. See what our customers have to say about us by reading their reviews and testimonies.

We’re Service Plumbers Too!

Our plumbers are certified to fix and replace your water heater as well as install new ones. Changing the temperature setting on your tankless water heater might sometimes solve the problem with your tankless water heater. To get your water heater inspected, call us at 281-302-6710 or click on the icon below.

How to adjust your water heater temperature

No one enjoys taking a cold shower. It’s much worse when you are scalded when the hot water is turned on. It is critical to correctly regulate the temperature on your water heater, not only for your health and safety, but also to save money on your power bill. Here’s how to regulate the temperature of your water heater to save money while also protecting your skin from sun damage.

The correct temperature range

It is recommended that your water heater be set within a specified temperature range for a variety of different reasons. A low temperature setting not only results in hot water that is merely lukewarm at best, but it can also promote bacterial development, which can lead to illnesses such as Legionnaires’ disease. This may be avoided by adjusting the temperature of the water heater to a level at which the bacteria Legionella cannot survive. A temperature of at least 140 degrees Fahrenheit (60 degrees Celsius) for water heaters is recommended by the Occupational Safety and Health Administration (OSHA) to prevent Legionella and other germs from growing in the water.

  1. The time it takes for third-degree burns to occur at 150 degrees Fahrenheit (66 degrees Celsius) is less than two seconds.
  2. Not to mention that a water heater that is set too hot might result in an excessively expensive power bill.
  3. The greater the distance between a faucet and the water heater, the greater the amount of heat that will be lost as the water flows, especially if the pipes are not insulated.
  4. When determining the appropriate temperature for your family and household, use your best judgment.

Make an adjustment, test it, and continue the process until you’ve found the ideal temperature setting for your house and water heater, which may take many attempts. Currently playing: Keep an eye out for this: Take a look inside the CNET Guide to Smart Living. 1:00

Adjusting water heater temperature

The interface used to control the temperature of a water heater will differ depending on the kind and model. Fortunately, the majority of water heater models can be modified in the same way. For example, most contemporary gas and electric water heaters are equipped with a thermostat concealed behind an insulated access panel. Electric water heaters are frequently equipped with two thermostats: one at the top of the tank and another at the bottom. Furthermore, most tankless water heaters include a display with a temperature reading as well as controls for altering the water heater’s temperature.

Turn on the water in the bathroom or kitchen sink and let it to run until the water is completely hot before using.


The process of adjusting a tankless water heater is quite similar to the process of adjusting your air conditioning thermostat. Adjust the temperature by using the digital control panel, which may be adjusted up or down as desired.

Gas or electric water heaters

Some gas water heaters include a dial towards the bottom of the device that may be adjusted simply by turning it – no tools are required for this operation. Nonetheless, most current tank water heaters (whether gas or electric) require a bit more effort, but the process is still straightforward and should only take a few minutes.

  • Turning off the water heater’s electricity at the circuit breaker is the first step. To remove a thermostat(s), locate the access panel for the thermostat(s) and remove it using a screwdriver
  • Remove the insulation by peeling it back. To adjust the thermostat, use a flathead screwdriver to turn it up or down.
  • If your water heater has two thermostats, make sure they are both set to the same temperature. The temperature on the top thermostat should be a few degrees higher than on the bottom thermostat.
  • Replace the insulation and re-install the access panel, if necessary. Reconnect the water heater’s power supply
  • It is possible that you may need to relight the pilot light on a gas water heater.

Once you’ve made the necessary adjustments, you should wait at least three hours before checking the water temperature once more. It is possible that you may need to make more modifications in order to get the desired temperature. If you’ve increased the temperature and are still getting chilly showers, it’s possible that your hot water heater has to be serviced or completely replaced. Is the energy efficiency of your home high? Here are five different methods to find out. CNET’s Guide to Smart Livingis a one-stop shop for tips, techniques, and how-to guides that can help you live a more intelligent life.

See also:  How To Flush Out A Hot Water Heater

How to Adjust Your Water Heater’s Temperature

It has been shown that even ordinary tap water might be hazardous. Every year, a number of individuals (mainly youngsters) are sent to hospitals after suffering burns as a result of water heaters that have been set excessively high. But what exactly does “too high” imply, and how can people ensure that their water heaters are set at a temperature that will not cause them to be burned, is a mystery. The Environmental Protection Agency (EPA) recommends a hot temperature setting of 120 degrees Fahrenheit for both safety and energy savings reasons.

Use this procedure if the stickers on the water heater do not inform you how to set the temperature and you are unable to locate the owner’s handbook.

  1. Make sure to run hot water for at least three minutes from the faucet nearest to the water heater. Fill a glass with hot water and check the temperature
  2. If the water temperature is higher than 120 degrees, adjust the dial, wait approximately three hours, and then check again. Continue until the water reaches 120 degrees Fahrenheit.

The temperature of the water heater should be checked the next morning before anyone uses any hot water as a last check.

Once you have found the perfect setting, make a note of it on the dial so that you do not have to go through the testing procedure again. Here are some more suggestions for extending the life of your water heater.

Family Handyman

Take frigid or blistering hot showers, depending on your preference. Is it possible that you like lukewarm water? Many homeowners may not give much thought to their tankless water heater, yet it is an important component of your home’s plumbing system. An inefficient water heating system might be the most significant contributor to high power and water expenses. This makes scheduling regular repair and maintenance of your unit vital in order to guarantee that hard water is not hurting it and that the unit is operating within the optimal temperature range.

There are several safety and health hazards that you should be aware of.

In addition, you should make every effort to reduce your impact on the environment.

We must acknowledge that having access to these priceless possessions entails a duty of gratitude on our part.

Tankless Water Heater Temperature Setting – Things To Consider

Take chilly or blazing hot showers depending on your preferences. Could it be that you prefer lukewarm water over hot water? Despite the fact that many homeowners do not give much thought to their tankless water heater, it is an important component of your home’s plumbing system. One of the most common reasons for high power and water bills is a malfunctioning water heating system. This makes scheduling regular repair and maintenance of your unit vital in order to guarantee that hard water does not damage it and that the unit is operating within the optimal temperature range.

There are several safety and health hazards that you should be aware of.

In addition, you should make every effort to reduce your impact on the natural world.

In order to feel grateful for having gained access to these priceless possessions, we must first realize that we have been granted access.

Bacterial Accumulation Prevention

Bacteria tend to congregate in warm, stagnant water, although it can also accumulate in cold water on occasion. However, it is most commonly seen growing in water that is between 41 and 135 degrees Fahrenheit in temperature. The temperature setting of 140 degrees Fahrenheit is somewhat higher than the risk zone limit of 130 degrees Fahrenheit. As a result, producers regulate the temperature to avoid bacterial development. Despite this, some specialists believe that a temperature of 120 degrees Fahrenheit is safe for the majority of people.

A pre-set water temperature is included with the newer units, and they also have an anti-scaling technology that delivers water to the tap at 120 degrees Fahrenheit.

In electric tankless water heaters, legionella bacteria accumulates in the machine’s bottom and has the potential to cause a type of pneumonia in those who are exposed. It is spread in the air by inhaling filthy water droplets when bathing or taking a shower.

Marketing Perks

When companies offer you a tankless gas water heater, their first aim is to ensure that you are completely satisfied. The fact that you have energy and water bills does not worry them. They want you to be completely happy when you turn on the water faucet and receive properly warm water from the faucet. In the event that you receive just lukewarm water, the vast majority of you will conclude that the device is incapable of heating water and that your hard-earned money has been spent. The temperature of a tankless water heater may be adjusted to provide hot water with no effort.

However, it has a significant impact on sales psychology.

Nonetheless, investing in a high-quality heater will prove to be useful in the long run.

Energy Savings

The best hot water heater temperature for the most majority of propane water heaters, as previously indicated, is 140 degrees Fahrenheit. The Department of Energy in the United States, on the other hand, recommends a temperature of 120 degrees Fahrenheit. You may also adjust the amount according to your own requirements and tastes. If you are going to be away for a few days, it is best to set the thermostat to 120 degrees F to prevent bacteria from growing within the unit.

Frequent Hot Showers

If you have a large family who takes many showers at the same time, a 20-degree temperature difference might have a significant impact on the amount of hot water available. If you take regular hot showers in your home, the 120 degrees Fahrenheit tankless water heater temperature setting is the best choice for you.

Dishwasher Performance

Do you have a dishwasher that is more than a decade old? Many earlier versions do not have an advanced heater, and as a result, they will not be able to wash the utensils correctly with a tankless water heater temperature change of less than 140 degrees Fahrenheit.

Kids And Elders In The House

The water temperature should be set at 120 degrees F in homes with small children and elderly residents to reduce the danger of burning or scorching at the water fixture.

How To Set The Best Temperature For Tankless Water Heater?

There are five distinct types of water heating systems available for purchase in the marketplace. Whether you have a standard tank-style or a tankless unit, we will provide extensive instructions on how to control the temperature of your unit in order to save money on your utility costs. In addition, you will learn how to regulate the temperature on a Rinnai tankless water heating system. So let’s get started.

Solar-Powered Heaters

These gadgets rely on the energy provided by the sun and therefore require solar panels to be installed on the roof. They perform admirably on bright, sunny days, but in inclement weather, you will want a backup unit to keep you safe. When it comes to energy efficiency, they are just great. However, before you can put them to use in your home, you must first obtain clearance from the government.

Apart from that, it is incredibly expensive, and you will not get a return on your investment for a lengthy period of time. They are equipped with a control panel, which allows you to easily adjust the temperature to suit your requirements.

Tankless Water Heaters

No container is provided as implied by the name of this group. Their operation is dependent on super-heated coils that quickly heat water anytime you use it. Because they are available in several sizes, you may choose the one that best suits your water requirements. Tankless gas water heaters perform significantly better than electric water heaters. The electric ones, without a doubt, will increase your electricity bills. The next step is to learn how to adjust the temperature of both gas and electric heaters.

The temperature control valves for tankless water heaters have a knob with different names on it, such as a, b, and c, on them.

The following is the significance of each label:

  • Low temperatures range from 80 to 90 degrees Fahrenheit
  • Hot temperatures range from 120 degrees Fahrenheit to 160 degrees Fahrenheit
  • A temperatures range from 130 degrees Fahrenheit to 140 degrees Fahrenheit
  • C temperatures range from 150 degrees Fahrenheit to 160 degrees Fahrenheit

Some machines additionally offer a “vacation” mode, in which the water is not heated but the pilot light is kept lit.

Electric Tankless Water Heater Temperature

Take control of the circuit breaker and seize control of the access panels. Under the insulation, look for the thermostat tankless water heater temperature adjustment. Using the flat screwdriver, move the thermostat control closer to the desired temperature. Change the access panels and insulation first, and then turn on the electricity to complete the process.

Heat Pump Water Heaters

The heat from the wind and the soil is used by these gadgets to raise the temperature of the water. They just utilize electricity to transmit heat; they do not use it to generate it. Furthermore, it is equipped with a boiler that must be cleaned on a regular basis. These gadgets have the potential to save you up to 60% on your electricity expenses. They are, however, quite expensive, and their deployment necessitates a significant amount of room. The pump at the top of the tower requires around 8 feet of vertical space.

Condensing Heaters

These water heaters heat the water by utilizing exhaust gas as a heat source. If you have access to a natural gas supply in your neighborhood or home, this unit would be an excellent alternative for you. Because it has a larger tank, it is an excellent choice for large families. It has a control panel that allows you to adjust the temperature.

Tank-Storage Water Heaters

Traditional water heaters are capable of heating a large volume of water quickly and efficiently. Because the tank is insulated, the water remains warm for an extended period of time. The boiler’s capacity is limited, so if you demand more hot water than the boiler can provide, you may have to wait up to an hour or more for it to refill. They are low-cost and are most typically seen in residential and commercial settings, where they provide excellent value. The main drawback is that they use a lot of energy when in use.

It is necessary to first obtain a straight screwdriver in order to manage the temperature of the device.

After that, turn off the heater and remove the top and bottom covers from the room. With the aid of the screwdriver, you may make adjustments to the thermostat. Replace the covers and turn on the electricity.

How To Improve The Efficiency And Performance Of The Tankless Water Heater?

Water heater controller kits are now readily accessible on the market, and they are inexpensive. As a result, if you have a solid internet connection and a mobile phone or tablet, you may purchase and install it to regulate the temperature of your unit. With this kit, you will be able to operate your device from any location on the planet. Additionally, you may turn it off to conserve energy and then turn it back on when you get home.

Insulate Traditional Tank-Style Machines

Water heater controller kits are now readily accessible on the market, and they are rather inexpensive. In order to regulate the temperature of your unit from your mobile phone or tablet when connected to a solid internet connection, you may purchase and install the device. You will be able to operate your gadget from any location in the world if you purchase this package. It’s also possible to turn it off to conserve energy and then turn it back on when you get home.

Replace Out-Dated Models

If your appliance is older, or if you frequently take showers with cold water, the likelihood is that your heater is not operating efficiently. The installation of a new gadget may provide you with a more pleasant and stress-free start to your day than previously. Because current hybrid and tankless systems are extremely energy efficient, you may save a significant amount of money on your utility costs by utilizing them.

Descale It

The hardness of the water might reduce the effectiveness of your system. Mineral development within the container has an adverse effect on the container’s performance and longevity. When the temperature is high, the buildup increases. As a result, reduce the temperature and descale your boiler every three months by utilizing the best tankless water heater flush kit available to you. You may also arrange expert repair and maintenance services for systems that have been neglected for a long time.

Decrease The Water Flow

It is possible to reduce the amount of warm water used by replacing old-fashioned showerheads and fixtures with newer models that require less water flow.


Now that you’ve finished reading this comprehensive guide, you should be fully aware that the greatest tankless water heater temperature setting is 120 degrees Fahrenheit in ideal circumstances. By using this option, you may save money on electricity while also reducing the risk of burns and other health risks. The best part is that it destroys bacteria, ensuring that you and your family remain safe and healthy. It is possible to find a variety of various water heating systems on the market. The most recent models contain a temperature control knob that allows you to quickly fine-tune the temperature to your specific tastes.

Tankless Water Heater 101

There are advantages and disadvantages to using a tankless water heater; it all comes down to how much hot water your home wants and how patient you are with your investment in order for it to pay off. We’ll guide you through the major pros and cons of each option to assist you in making an informed purchasing decision. While tankless water heaters are more expensive (often up to three times the price of a typical water heater), they have a longer life cycle and can reduce your power expenses substantially.

Using extra hot water (for example, 86 gallons per day) can increase the energy efficiency of your water heater by 8 percent to 14 percent.

The primary advantages of a tankless water heater will be discussed in this tutorial, as will how to determine the size and kind of water heater you’ll need, how they function, and what makes them distinct from one another.

We’ll also discuss some of the parts of your life that you may have to give up if you decide to get a tankless water heater.

Advantages of a Tankless Water Heater

There are a number of advantages to using a tankless water heater rather than a traditional tank water heater. What truly distinguishes a tankless water heater from a typical water heater is the fact that they may remove standby heat loss completely. Tankless hot water heaters heat water on demand, as opposed to traditional hot water heaters, which heat and store water on a continuous basis. In other words, there will be no hot water lying idle in a tank, wasting its heat. Some tankless water heaters are controlled by an athermostat, which allows you to alter the output temperature with greater freedom.

  1. Your bigger, conventional heaters, with their 30-50 gallon tanks, take up a significant amount of floor area.
  2. In comparison, a tankless water heater is around the size of a big computer, which explains why these bad boys are so popular in small houses with little space for storage.
  3. You’ll need to figure out how many hot water devices you want to use at the same time (for example, running the laundry and shower at the same time) and multiply the total flow rate by the number of hot water devices (in gallons per minute).
  4. Low-flow water faucets can help you save money on your water bill by lowering the flow rate.
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Calculating Temperature Rise

When choosing on which kind to choose, you should take into account both the flow rate and the temperature rise involved (ie: difference between groundwater temperature and desired output temperature). You may use this map to find out what the typical groundwater temperature is in your neighborhood. Simply subtract the temperature of your ground water from the temperature of your intended output. When it comes to heating your water, you’ll want to aim for temperatures between 100 and 115 degrees Fahrenheit.

Calculating Flow Rate

The flow rate may be estimated by multiplying the GPM for all of the household water fixtures that will be used at the same time. The flow rate of a bathroom faucet with low flow is estimated to be between 0.5 and 1.5 GPM. The majority of faucets installed after 1992 have a flow rate of 2.2 GPM, with 3.0 and 5.0 GPM available after 1992. The flow rate of a kitchen faucet can range from 3.0-7.0 GPM. There are no low-flow statistics for kitchen faucets since they do not employ aerators. Showers have a modest flow rate that is typically between 1.0 and 2.0 GPM.

If you discover that hot water is not reaching your faucet as soon as you would like, you may improve the efficiency of your heat source by installing a circulation system.

Depending on the tankless type you pick, it may already be configured for the addition of a circulation system, eliminating the need to reconfigure pipework or a buffer tank.

What Size Tankless Water Heater Do I Need?

Here’s an example from the Compact Alliance to show you how to use these data to determine the size of tankless hot water heater you’ll need for your requirements: The temperature of an ordinary shower will be between 104 and 106 degrees, and it will require 2.6 gallons of water. Assuming that the water temperature entering your home is 40° and that you wish to create enough hot water to run two showers at the same time, what temperature rise would you need to produce to achieve this goal? Answer: You’ll need to elevate the temperature of the entering water from 40 degrees to 105 degrees.

How Does a Tankless Water Heater Work?

When you turn on the hot water tap, the water begins to heat up. The cold water enters the unit through a pipe, where it is heated by an agas burner or electric components before being released (heating coils). A high-capacity heat exchanger efficiently transfers heat from one source to another. The passage of water causes this exchanger to become active. Flow sensors determine the precise flow rate while also taking into consideration the temperature measurements at the heater’s input and outflow.

  1. Dedicated sealedvent systems allow combustion gases to securely depart the building.
  2. The disadvantage of tankless heaters is that their output restricts the amount of water that can be flowed through them.
  3. Although the flow rate of gas-fired tankless water heaters is higher than that of electric ones, they are nevertheless stressed when numerous hot water sources are running at the same time, as is the case in many households.
  4. In order to correctly install these systems, you’ll need to consider factors like as fuel type, environment, local building code requirements, and safety concerns.

Tankless Water Heater ProsCons

Energy savings of around $108 per year are estimated by the United States Department of Energy for gas-fired tankless water heaters when compared to standard tanks. Electric tankless heaters save $44 per year on heating costs. However, this figure must be weighed against the cost of the heaters themselves to be meaningful. A tankless water heater can range in price from $1,000 to $3,000 depending on the model. You’ll want to be certain that your home is capable of supporting a tankless water heater.

This may be a time-consuming and expensive undertaking.

It is possible that the gas pipe, gas meter, and gas line to the meter in your house are not the proper size for the high gas load that will be required to replace the typical storage gas heater in your home.

These heaters may underperform or even pose a safety danger to your family if they are not placed properly.

Energy Efficient

Tankless water heaters that use natural gas are 23 percent more efficient than standard storage water heaters, according to research (60 percent efficiency). Tankless water heaters fuelled by natural gas are also eligible for a $300 tax credit. For storage-tank water heaters, you’ll be able to calculate how much hot water the heater can supply over a specific amount of time by factoring in the first-hour rating and the gallons per minute for tankless water heaters, among other factors. Hot water heaters are normally capable of producing 3.5 gallons of hot water per minute on average.

According to, in your situation, they can be 23 percent to 34 percent more energy efficient than standard lighting.

Types of Heaters

Tankless heaters are available in two main configurations: point-of-use and whole-house models. Point-of-use systems are limited in their ability to heat water for only one or two outlets. Because they’re so compact, you can easily tuck them away beneath a cabinet or inside a closet. You’ll be able to limit water loss by shortening the time between events (time it takes for the hot water to reach your faucet). In bigger homes, this lag period might span several minutes or even several hours. You may also choose between versions that run on electricity, propane, or natural gas.

Gas and Propane

As a result of their greater power, gas and propane-powered heaters are suited for use in whole-house systems. The storage tank is the most significant distinction between a whole-home gas tankless water heater and a normal gas water heater. When compared to a typical gas tankless water heater, an Energy Star certified tankless water heater harnesses the potential of a secondary heat exchanger to cut energy usage by 9 percent. This secondary exchanger removes any excess heat from the combustion gas and cools it down to the point of condensing it.

Electric models are more common at point-of-use scenarios, while some individuals choose to purchase two of them in simultaneously.


A tiny electric tankless heater is a preferable option for those who want to take a shower in their pool house or have hot water for an outdoor meal. Furthermore, electric variants do not emit greenhouse gases and may be operated via a wireless remote control system. Additionally, you won’t have to be concerned about floods due to a ruptured tank.

Getting the Best Tankless Water Heater

We aim to assist you in selecting the most appropriate tankless water heater for your hot water demands and financial situation.

For more information on a tankless hot water heater, please contact us. Our licensed professionals are available to answer any queries you may have and do the service on YOUR timetable.

How To Adjust Temperature On Rinnai Tankless Water Heaters? (5 Steps)

Do you want to know how to control the temperature of your Rinnai tankless water heater? Keep reading. The most important initial step is to remove the front panel of your Rinnai tankless water heater in order to reveal the ‘guts’ of the unit. I’ll go through everything in this tutorial.

  • Removing the front panel
  • Pressing the priority button
  • Removing the front panel Swapping out switches 6 and 5 in the dip switch SW1
  • Swapping out switches 6 and 5 in the dip switch SW1.

Let’s get this guide started right now!

Adjusting Max Temperature On Rinnai Tankless Water Heaters

The frustration of going through the bother of installing a tankless water heater only to discover that it does not heat the water sufficiently for your home is indescribable. Unfortunately, numerous homeowners are unaware that the default temperature of 120F on Rinnai heaters may be raised to 145F. It takes only a few easy steps to raise the default temperature, and most Rinnai tankless water heaters can be set to a maximum temperature of 140 degrees Fahrenheit. When altering the Rinnai heater temperature, the first step is to remove the front panel of the heater and check the temperature setting.

Dip switches are miniature switches that are connected in series on a printed circuit board.

The directions in this tutorial will be particular to the Rinnai V53DE tankless water heater, although the overall technique will be comparable to those of other tankless water heaters.

In addition, find out which tankless water heaters are the best rated in cold climates.

Step 1 – Turn Power On

The power must be turned on in order to make changes to the default temperature on a Rinnai machine. However, you will also be hitting buttons on the machine, which means that the power must be connected in order for you to complete your task.

Step 2 – Remove Front Panel

The first step in modifying the preset maximum temperature on a Rinnai tankless heater is to remove the front panel of the heater. On either side of the water heater, there are two plastic trim portions that may be pulled out for access to the tank. It is possible to see the screw heads once the trim pieces have been removed. With a screwdriver or an electric drill, you may remove the four screws from the wall. Carefully remove the front panel from the vehicle. Also see: What Are the Best Tankless Water Heaters for the Outdoors?

Step 3 – Press Priority Button

The priority button must be illuminated in green and beep when pressed. If this is the case, press the priority button.

Step 4 – Flip Switch6 in Dip Switch SW1

Take a look at the dip switches located within the Rinnai tankless heater; they are the little switches that are linked in series to a circuit board.

With A Temperature Controller

If your Rinnai tankless heater is equipped with a temperature controller (with up/down arrows to adjust the temperature), there is a specific switch that must be turned on.

To change the maximum temperature to 140 degrees Fahrenheit (rather than 120 degrees Fahrenheit), you must flip switch6 in the dip switch SW1. Dip switch SW1 is a row of tan-colored switches located within the heater’s interior. It is necessary to turn on the switch6.

Without A Temperature Controller

A temperature controller is not required for your Rinnai tankless heater, which means that the default temperature setting of 120F and the maximum setting of 140F will be available. Switch5 (rather than switch6) in the SW1 dip switch must be flipped in order for the temperature setting to be changed to 140 degrees Fahrenheit (tan-colored switches). Also see: What Are the Best Tankless Water Heaters for Point-of-Use Applications?

Step 5 – Verify Temperature Change

With a temperature controller, you may simply press the up arrow to test whether you can raise the temperature, as well as to ensure that the dip switch is operational. If you don’t have access to a temperature controller, you may experiment by opening a faucet and seeing if the water temperature rises.

Step 6 – Install Front Panel

The front panel can now be re-installed once you have adjusted the default temperature setting and verified that the modification was successful. Simply reinstall the four screws and move the two plastic trim pieces to the side to complete the process. In addition, find out which tankless water heaters are the best rated in cold climates.

Safety Issues With Raising Max Temperature

When increasing the hot water temperature in a family, especially if you have small children, exercise caution at all times. When the water temperature is 140 degrees Fahrenheit, scalding can occur in as little as three seconds. If your Rinnai tankless water heater does not have a temperature controller and you have young children, the Centers for Disease Control and Prevention suggests maintaining the temperature at 120 degrees Fahrenheit or below. If you have a temperature controller, you may set it to any temperature between 120F and 140F, but not higher than the maximum temperature of 140F, after adjusting the default temperature.

Not Enough Hot Water

Additionally, if you aren’t getting enough hot water after boosting the default temperature, you may want to drop the temperature a little. Lowering the temperature to the level that you really use at the faucet will result in less need to mix in cold water at the faucet, and you will receive more hot water as a result of this.

Adjusting the Temperature on Your Electric Water Heater

To make a change to the temperature of your electric water heater, you don’t need to have a high degree of technical knowledge or specialized equipment. This is a quick and simple at-home remedy that just takes a few minutes, and you probably already have all of the supplies you need on hand. Fortunately, the process is fairly consistent across the brands of electric water heaters that you are most likely to own, with only a couple of minor differences depending on the manufacturer’s design choices; the overall size of your water heater has no bearing on how you must proceed through our simple steps!

Remove Cover Plates

  • The thermostats are located on the front side of your unit, behind two cover panels that must be removed in order to obtain access to them. This may be accomplished by using a Phillips screwdriver or a 1″ nut driver to remove the screws (think “righty tighty, lefty loosey” when doing so)

Remove Excess Materials

  • Many eclectic water heaters, particularly newer versions, have additional insulation that will need to be removed before they can be used. Simply remove the excess material and store it in a secure location. Additionally, you will discover a plastic safety plate that can be simply detached or twisted upwards to reveal your thermostat temperature settings

Locate Temperature Dials

  • Congratulations on having made it this far! Not only are you more capable than you anticipated, but you’re also practically finished! The dial should now be visible
  • This is what regulates the temperature settings on your thermostats, which will make the time spent in the tub when the weather cools down that much more enjoyable. Don’t forget about how we indicated that some design options may differ based on the manufacturer? Now is the time when you’ll notice the following differences: The settings on some dials are alphabetical, while others are numerical
  • There are even dials that vary from “hot” to “extremely hot,” such as the dials we are altering in our movie
See also:  How Do I Know If My Hot Water Heater Is Broken

Adjust Your Dials Accordingly

  • Everything is now complete except for the actual adjustment of your electric water heater. You’ll need to set both of your thermostats to the same temperature in order to get the ideal temperature. Simply use a flat head screwdriver to make the necessary adjustments to the dials. Be mindful of the fact that it doesn’t take much to make your water hotter
  • Ensure that you’re testing these modifications to ensure that your water is at a safe temperature before you reverse the procedures and put everything back to way it was before, as well as replacing the front panel covers. Keep in mind that it will take some time for the water heater to acclimate to the new settings, so be patient. You’re now an expert when it comes to adjusting the temperature of your home’s electric water heater in a matter of minutes.

Bonus Step: Add a Few Extra Gallons of Hot Water

  1. There is a simple plumber’s method you may try at home to see if you can get a few additional gallons of hot water out of your water heater without breaking the bank. All you have to do is adjust the temperature dial on your bottom thermostat to be slightly higher than the temperature dial on your top thermostat. Here’s why this tiny trick could be useful to you: Water enters your electric water heater through a dip tube that extends from the top of the unit to the bottom of the unit. The hot water that comes out of your water heater leaves via the tank’s opening at the top. Your water heater does not use both heating elements at the same time because there is just insufficient electricity being supplied to the water heater. Due to the fact that the water exits the tank from the top, the top element takes precedence in heating the water that is leaving the tank first. After the top of the water heater reaches the desired temperature, the power is shifted to the bottom of the water heater, which begins to heat the water that is being fed in. Adjusting your thermostats to these settings allows the element at the bottom of the tank to operate for a longer period of time and delivers hotter water up the tank, extending the amount of time it takes before the top of the heater cools down sufficiently to allow power to be transferred back to it. It is possible that this approach will result in a few additional gallons of hot water.

Related Media

Want to learn more about electric water heaters? Check out this article. Take a look at some of our related content: Electric Water Heaters are a type of water heater that uses electricity to heat water.

Services in PhoenixBeyond

When you’re in need of plumbing services in the Phoenix, Glendale, Scottsdale, or Chandler areas, you can rely on Robins Plumbing to give you with timely and competent service. To learn more, call our team today! In addition to our toilet services, we also provide a wide range of residential and commercial plumbing services, such as: drain cleaning, water heater repair and replacement, sewer camera inspection and locating, backflow prevention, commercial and residential jetting, water treatments, and other related services.

Take a look at our internet reviews to see what other people have to say about our local plumbing company!

How to Adjust a Hot Water Heater

Documentation Download Documentation Download Documentation There is a delicate balance between the temperature of the water in your home—too high, and you run the danger of getting scalded; too low, and you’ll be shivering in your shower. Fortunately, regulating a hot water heater is a straightforward process if you go with caution. For your own safety, turn off the electricity to the water heater at the main circuit breaker in your home’s electrical panel. Afterwards, remove the access panel from the unit’s side and use a flat-blade screwdriver to increase or reduce the temperature in accordance with the temperature ranges specified on the control dial.

  1. 1 Determine whether or not the temperature of your water has to be adjusted. Most manufacturers recommend that the water used in your homestay be kept at a temperature of roughly 120 degrees Fahrenheit (49 degrees Celsius) for safety reasons. The temperature of most water heaters will already be adjusted to this level when they are installed. In most circumstances, it’s advisable to simply leave it alone in order to reduce the danger of harm.
  • Instead of the water heater’s temperature being the source of the problem, it’s possible that a faulty heating element or inadequate insulation is to blame. A trained plumber can assist you in diagnosing and repairing a malfunctioning water heater.

2 To adjust the temperature of the water heater, turn the dial on the bottom of the unit. Gas water heaters are simple to use; they are controlled by a single knob that regulates the quantity of heat provided to the unit. Turning this knob to the left (counterclockwise) will raise the temperature, which will result in hotter water being produced. It will cool down if you turn it to the right (counter-clockwise).

  • The lower temperature range of the vast majority of gas water heaters will be anywhere between 90 and 110 degrees Fahrenheit (32 and 43 degrees Celsius), while the upper temperature range will peak at roughly 140–150 degrees Fahrenheit (60 and 66 degrees Celsius). It’s possible that the dial on your gas water heater isn’t numbered, which makes determining the ideal temperature a little more difficult. To get around this, just take the temperature of the water several times after making changes to your settings and write the exact degree reading on a piece of paper or on the dial itself.

Gas water heaters have a temperature range of 90–110 °F (32–43 °C) at their lowest setting, and an upper temperature range of 140–150 °F (60–66 °C) at their highest setting, for the most part. It’s possible that the dial on your gas water heater isn’t numbered, making finding the ideal temperature a little more challenging. To get around this, just take the temperature of the water several times after making changes to your settings and note the exact degree reading on a piece of paper or on the dial itself;

  • Heat is more effective in killing most common bacteria, including health-threatening pathogens such as Legionella, E. coli, and staphylococcus
  • Higher temperatures kill more germs. Avoid heating your water to a temperature greater than 120 degrees Fahrenheit (49 degrees Celsius). A substantial danger of burns, particularly for youngsters and the elderly, can result from this practice.

Increase the temperature in order to save money on your energy bills. Heating significant amounts of water quickly becomes prohibitively costly. Lowering the temperature of your water heater to the range of 100–110 degrees Fahrenheit (38–43 degrees Celsius) will help you save money on your next heating bill. Even a minor adjustment can result in significant savings over the course of a few months.

  • Be aware that your water will not be as hot, which may have an influence on your comfort or the degree of sanitation for cleaning tasks.
  1. Step 1: Turn off the electricity to the water heater. Locate the water heat switch on your home’s central circuit breaker panel, which should be located near the water heater. Make sure that this switch is in the “Off” position. This will interrupt the flow of electricity to the device, allowing you to open it without worry of getting electrocuted or electrocuted.
  • Do not attempt to make any changes to your water heating system until you have double checked that the power has been turned off. Depending on whether your water heater’s circuit breaker is clearly labeled, it may be essential to use a multimeter to check for a live current. Zero volts is what you’re searching for in this case. Keep in mind to label the appropriate breaker after you’re finished.

2 Remove the access panel from the unit’s side by pulling it out. Identify the two screws at the top and bottom of the panel and loosen them with a flat-bladed screwdriver to complete the process. Pull the panel away from the body of the device and place it somewhere safe and convenient for you. Take cautious not to loose any of the screws.

  • Some versions may have a second plastic cover behind the metal access panel, which can be difficult to see. With a little tug, you should be able to gently remove it.

3 Remove or push the insulation that is covering the thermostat to the side. An additional layer of insulation is installed within the water heater. If it’s a single piece of styrofoam or similar material, you’ll be able to just lift it out with your hands. Hand-move the fiberglass insulation out of the way to make room for the thermostat controls to be accessed.

  • It is necessary to insulate a water heater in order to prevent heat loss and guarantee that measurements are more accurate.

4 Adjust the temperature setting with a flat-bladed screwdriver by turning it up or down. The temperature ranges for the high- and low-ends of the temperature scale will be displayed at the bottom of the thermostat.

To adjust the temperature, insert the tip of a screwdriver into the colored adjustment screw and turn it clockwise. When you twist it to the left (counterclockwise), the temperature will decrease, and when you twist it to the right (clockwise), the temperature will raise.

  • The adjustable screws on contemporary electric water heaters are equipped with indicator hands that inform you roughly how hot the current setting has been set to. Attend to where your palm settles, since this will help you to fine-tune the temperature of the water even more accurately
  • In the event that your water heater has two heating elements, make certain that both thermostats are set to the identical temperature so that one isn’t required to perform more effort than the other.

5Replace the insulation as well as the access door. When you’re pleased with the new temperature setting, return everything to the way it was when you first started. Make sure that the insulation completely covers the internal thermostat before reinstalling both protective covers and tightening the screws to lock them in place. 6 Restore electricity to the water heater if it has been disconnected. Return to your main breaker panel and turn on the water heater by turning the switch to the “On” position.

  • The flowing water temperature may not reach its maximum temperature for up to an hour after your unit has been turned off for a lengthy period of time
  • This is normal.
  1. 1 Fill a glass halfway with boiling water. Set a timer for one minute and turn on the nearest faucet to the water heater to start the process. As soon as the water is boiling hot, place a drinking glass or similar container under the stream and hold it there until you’ve captured a few inches.
  • It is preferable to utilize a container that has been kept at room temperature in order to obtain the most accurate reading possible.

Cooking thermometer: Place a cooking thermometer in the boiling water. Prepare your thermometer in advance so that you may put it in as soon as the container is completely full. After ensuring that the probe is completely immersed, wait 30-60 seconds for it to assess the temperature of the water.

  • Cooking thermometer: Place a cooking thermometer in the boiling water. Preparing your thermometer ahead of time will ensure that you can put it in as soon as the container is full. After making certain that the probe is completely immersed, wait 30-60 seconds for it to assess the temperature of the water.

3 Determine whether or not the water is sufficiently hot. You may be confident that your water heater is operating at peak performance if the temperature is at or near 120 degrees Fahrenheit (49 degrees Celsius). If the temperature is any lower than that, it may need to be raised a few degrees. Keep in mind that temperatures surpassing 120 °F (49 °C) will be too hot for the majority of people in their homes.

  • Increase the temperature of your water by 10 degrees at a time to lessen the chance of burning yourself

4 Wait three hours before checking the water temperature again. It will take some time for your water heater to adjust to the new temperature setting, so please be patient until it reaches the required temperature. In the meanwhile, refrain from taking a bath or using any electrical appliances in case the water being circulated is hotter than you planned.

  • Make any required modifications before everyone in your home begins their daily routine
  • Otherwise, they will be inconvenienced.

Create a new question

  • Question What is the purpose of the letters ABC on a water heater? Answer from the Sealweasel Community It is a matter of temperature settings. The letter A represents the lowest temperature, while the letter C represents the highest/hottest temperature. These letters are printed on the water heater’s control knob. Question My water heater’s setting control has the letters A, B, and C on it. What is the best way to determine if A is the lowest temperature or C is the lowest temperature? Answer from the Sealweasel Community The lowest temperature is represented by the letter A. The maximum temperature is C, while the lowest temperature is B

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  • Consider lowering the temperature of your water heater throughout the spring and summer months, when you will be using less hot water
  • This will save you money. Non-domestic institutions, such as restaurants, may be able to get away with utilizing a temperature setting as high as 140 degrees Fahrenheit (60 degrees Celsius).

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Things You’ll Need

  • Cooking or candy thermometer
  • A drinking glass or other similar container
  • A flat-bladed screwdriver Multimeter (for determining the voltage of the circuit breaker)

About This Article

Summary of the ArticleXIf the temperature of your hot water isn’t just perfect, you can easily modify it in a matter of minutes. All you have to do to adjust the temperature of a gas heater is turn the temperature dial located at the bottom of the heater. To get to the temperature dial on an electric heater, you’ll need to remove the access panel and the insulation covering that covers it. To reduce the risk of electrocution, make sure you first turn off the circuit breaker for the water. To adjust the temperature dial, a flathead screwdriver is required.

If your dial does not have numbers on it, test the water temperature using a kitchen thermometer or your fingertips, and then adjust the dial as necessary to your liking.

Continue reading for additional information, including how to regulate a water heater with dual heating components. Did you find this overview to be helpful? This page has been seen 83,995 times thanks to all authors who worked together to create it.

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