What Temperature Should You Set Your Tankless Water Heater?

What Is The BEST Water Heater Temperature Setting?

Please keep in mind that this content may contain affiliate links.This means that, at no additional cost to you, we may gain a small profit on purchases made via our links.In the event that you have already adjusted the temperature and are complaining to yourself that you ″have no hot water″ or ″don’t have enough hot water,″ there are a few reasons that might be impacting the heat.If all else fails, it’s possible that the heating element is faulty and has to be replaced.

How To Check Your Water Heater Temperature

The majority of water heaters do not have a temperature gauge with a digital readout on them.A temperature or heating range is marked on the thermostat, rather than a number.A cup and a culinary thermometer will be required in order to correctly determine the temperature of the hot water heater.If you haven’t used your water heater in at least one hour, turn on the faucet that is nearest to it.Allow the water to run for at least one minute to ensure that the water is at its warmest possible temperature before filling the cup with it.

  • Insert your cooking thermometer and make any necessary adjustments to the temperature settings.

Recommended Temperature Settings

Water heaters are pre-programmed to operate at temperatures about 140 degrees Fahrenheit, which is recommended by OSHA.The Environmental Protection Agency, on the other hand, recommends lowering the thermostat down to 120 degrees Fahrenheit to save power use and using a booster heater to attain sanitizing temperatures at certain outlets.Another point of view is that lower temperatures are preferable for homes with little children, although higher temperatures are more effective in cleaning and sanitizing surfaces.Recommendation from me Personally, I feel that the temperature of a water heater should be set around 130 degrees in practically all circumstances.However, the temperature is low enough to avoid scorching while being high enough to destroy hazardous microorganisms.

How To Turn Up Your Water Heater

If you are dissatisfied with the suggested temperature of your hot water heater, you may alter the settings to receive extra hot water.Although electric water heaters may require a screwdriver and potentially a tiny wrench or socket, most hot water heater settings are straightforward to modify.Keep in mind that the thermostat is factory configured to a recommended temperature, and that altering the setting may increase the risk of significant burns from the appliance.

How to Set Temperature on a Gas Water Heater

  • The temperature of a gas water heater may be adjusted by turning the setting knob on the water heater. The majority of gas control valves have a knob with different designations on them, such as A-B-C. Control valves for gas water heaters may be labeled differently depending on the manufacturer. In the majority of circumstances, the following is what each label indicates: Temperatures range from 80-90 degrees
  • hot (or triangle sign) = 120 degrees
  • A = 130 degrees
  • B = 140 degrees
  • C = 150 degrees
  • Very Hot = 160 degrees

There is a ″Vacation″ setting that appears from time to time. This does not heat the water, but it does ensure that the pilot light remains lit.

How to Set Temperature on an Electric Water Heater

Turn off the circuit breaker if necessary. Remove the access panels from the room. Under the insulation, look for the thermostat adjustment screwhole. Adjust the thermostat control to the appropriate temperature by using a straight screwdriver to make the adjustment. After replacing the insulation and panels, the power should be restored. Here’s a good video that demonstrates the procedure:

Factors That Affect Water Temperature

Some of the things that may influence the temperature of your hot water include the distance between the water heater and the outlet, the way the pipes are built, and the quality of the heating element itself, among others.Because of the length of the pipe and the small bore size, it will take longer for the hot water to reach the opening.Additionally, pipes that run beneath or outside the residence may be exposed to freezing or freezing temperatures in the winter and summer.If you have a big house, you may want to consider installing a hot water recirculation system, which may reduce the amount of time it takes to send hot water to all of the outlets in the house, as well as provide significant cost savings over time.If setting the thermostat does not result in the desired temperature, it is possible that the water heater element has to be replaced.

  • Alternatively, if you don’t notice a difference in water temperature after changing the thermostat, it’s likely that you have a malfunctioning thermostat that has to be replaced.

How To Adjust The Temperature on Rinnai Tankless Water Heater?

Even the most inexperienced person can recognize how excessive water temperatures may burn your skin and scalp.Children, babies, and newborns are the ones who are most at danger of being harmed by boiling water.The temperature settings on your Rinnai tankless water heater must be re-evaluated if you have set the thermostat to a very high number when making adjustments to them.This article will walk you through the process of adjusting the temperature on a Rinnai tankless water heater in order to assist you.Keep an eye out for more information.

How to Adjust The Temperature on Rinnai Tankless Water Heater?

  • Regardless of the Rinnai water heater type you have at your residence, the fundamentals of modifying the temperature settings are the same for all of them. This is how you may go about it: If your tankless water heater is off, press the power button to bring it back up to temperature. Set the priority settings on your water heater for the times of day when hot water is not required in your house.
  • Continue to press the ‘Priority’ button located on the water heater’s thermostat until a green flashing light displays on the display screen. This light is a positive indication that your water heater is operating at peak performance and heating the water to the desired thermostat degree. Use the up and down buttons on the thermostat to adjust the temperature to the desired level. You will be able to see the real-time adjustment on the digital display. The water in the sources that are connected to the heater will be heated at the temperature that you have specified until you decide to adjust the thermostat settings once more.

The Dangers of Using Extremely Hot Water

It’s possible that you’re discovering for the first time that skin burns may occur even at temperatures below 100 degrees Fahrenheit. Serious first-degree burns can occur when the following temperature settings are utilized:

  1. Using hot water at 140 degrees Fahrenheit for three seconds or longer
  2. Using 120 degrees Fahrenheit hot water for at least eight minutes
  3. Using hot water at 130 degrees Fahrenheit for at least twenty seconds

Because of this, you must never compromise on the safety of yourself or your children when it comes to water heater temps.To ensure that the water is safe for your infant, dip your own finger into it before putting him or her in the tub.Never leave your infant alone in the bathtub with a hot water supply running, regardless of whether the temperature of the water is mild or hotter than normal.It is essential to check the temperature of the water before bathing your children or grandchildren.

Key points to remember

There are many key considerations to bear in mind while adjusting the temperature settings on your Rinnai tankless water heater:

  1. The temperature of your water heater unit can only be adjusted between 98F and 110F degrees at any given time if it is currently generating hot water
  2. otherwise, you can only modify the temperature between 98F and 110F degrees
  3. or you can only adjust the temperature in the middle of the range.
  4. If the Rinnai tankless water heater is being utilized in a business context, it is necessary to review the recommended codes for adjusting the water temperature. It is possible that you will not be permitted to set it to the 120F setting that you would typically use for domestic use.
  5. If you have a Rinnai water heater unit that is controlled by a remote control, keep in mind that if the water heater is not used for at least six hours, the default settings will be used, which are 104 degrees Fahrenheit.
  6. The actual temperature of the water will be determined by the distance between the heating source and the faucets or taps. If the distance between the two points is greater, you can overcome the problem by constructing circulating pipes that prevent water from dispersing heat
  7. A mixer or more than one faucet being used at the same time may cause the water heater to fail to supply the desired temperature of water.

Frequently Asked Questions:

What temperature should a water heater be set at?

Professionals recommend that you keep the temperature of your water heater at or above 120 degrees at all times.In order to destroy all the germs within that may otherwise cause diseases while also avoiding scorching, this temperature must be reached.120 degrees is also an excellent temperature for a modest household with young children.Keeping your thermostat set at this temperature will also keep your energy expenses at a manageable level each month.

How to turn up the temperature on the water heater?

The specific procedure for altering the temperature of the water heater will be defined by the make and model of the water heater.The fundamentals of altering the temperature on all water heaters, on the other hand, are essentially the same.The most recent gas and electric water heaters are equipped with a thermostat that is built into the rear of the unit.The electric water heaters, on the other hand, have two distinct thermostats, one at the bottom and the other at the front of the unit.These thermostats are equipped with a digital display that shows the current temperature as well as other settings.

What is the maximum temperature for a hot water heater?

Every household water heater comes with two types of water temperature instructions: one that specifies the best temperature for everyday usage, and the other that specifies the highest temperature that may be reached.The maximum temperature of a water heater, according to experts, should not be more than 120 degrees Fahrenheit at all times.Heat in the water beyond 120 degrees Fahrenheit is considered harmful, particularly for newborns, and can cause skin burns.

How to lower the water heater temperature?

The specific procedure for altering the temperature of the water heater will be defined by the make and model of the water heater.The fundamentals of altering the temperature on all water heaters, on the other hand, are essentially the same.The most recent gas and electric water heaters are equipped with a thermostat that is built into the rear of the unit.The electric water heaters, on the other hand, have two distinct thermostats, one at the bottom and the other at the front of the unit.There are several settings on these thermostats, including a digital display that shows the current temperature and additional controls that allow you to reduce the temperature.

What is the best temperature for a water heater?

Despite the fact that all water heaters come with a set list of optimal suggested temperatures, there is always opportunity for customization.The Department of Energy recommends that you keep the temperature of your water heater at 120 degrees Fahrenheit or 49 degrees Celsius.In order to maximize energy efficiency, destroy all disease-causing germs, and prevent scalding, it is necessary to maintain this temperature for an extended period of time.Set at 120 degrees Fahrenheit, a medium-sized water heater may readily accommodate a modest household.

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.The water heater also mixes the hot water it produces with cold water in order to provide you with the temperature you choose when the shower head is turned on.

  • 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.
  • This results in a low amount of water flowing into the water heater.
  • It is possible to resolve this issue by turning down the temperature of the water heater.
  • It’s actually recommended that you use 120 degrees, although I know a lot of individuals who prefer hotter water.
  • 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 140-degree setting is intended for business use rather than for personal showers in the home.While taking a shower, you’ll actually get more hot water if you lower the temperature setting to 120 degrees or at most 130 degrees, rather than 120 or 130 degrees.You’ll be generating enough flow to turn on that tankless water heater and keep it running during your shower session.Excellent customer service!After less than an hour, they were at my house to have a check at my hot water heater.Benjamin was really kind and professional, and he even went the extra mile by calling the manufacturer and requesting that they send out replacement components under warranty as soon as possible after the incident occurred.

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.

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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.

Tankless Water Heater Temperature Setting 2022 – Important Things To Consider

Take frigid or blistering hot showers, depending on your preference.Is it possible that you like lukewarm water?Even though many homeowners may not give much thought to their tankless water heater on a regular basis, 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.

  • Tankless water heater temperature setting may appear to be a matter of personal preference, but there are a number of factors to consider.
  • There are several safety and health hazards that you should be aware of.
  • There’s also the matter of saving money on water and power bills to consider.
  • In addition, you should make every effort to reduce your impact on the environment.
  • We can no longer afford to waste the few resources available on our beloved world, such as electricity and water.

We must acknowledge that having access to these priceless possessions entails a duty of gratitude on our part.We should remember that half of the world’s population does not have access to safe drinking water, therefore we should act responsibly.

Tankless Water Heater Temperature Setting – Things To Consider

Safety And Health Concerns

Upon installation of a water heating equipment on your property, the temperature is set to 140 degrees Fahrenheit as a default setting.It is possible to get burnt if you take a bath with only warm water while the temperature is this high.Toddlers and the elderly are at a very high risk of suffering severe burns.Children’s skin is particularly sensitive, and elderly people’s reflexes may take a long time to recognize that the water is excessively hot.As a result, you may be asking why the tankless water heater temperature control has been set to an excessively high setting.

  • There are two primary reasons for this:

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.

  • Individuals with a weakened immune system or who suffer from persistent respiratory issues are not eligible for treatment.
  • 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.

  • The temperature of the water has absolutely nothing to do with the overall quality and durability of the heater.
  • However, it has a significant impact on sales psychology.
  • As a result, you should not place too much emphasis on the temperature of the device because it is only a question of adjustment.
  • 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. Adjusting the temperature of a tankless gas water heater They are typically equipped with a setting knob or lever that may be turned to get the desired temperature.. 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 labels on the water heaters of various brands are different from one another. The following is the significance of each label: Low temperature is 80 to 90 degrees Fahrenheit
  • hot temperature is 120 degrees Fahrenheit
  • very hot temperature is 160 degrees Fahrenheit
  • A temperature is 130 degrees Fahrenheit
  • B temperature is 140 degrees Fahrenheit
  • C temperature is 150 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.

  • As a result, you may install a timer that will switch off the heater when the water reaches the desired temperature, so lowering your energy expenses.
  • 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?

Install Water Heater Controller Kit

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

If you have a tanked water heater, you should consider insulating it in order to keep the water hot for an extended period of time. In order to avoid standby heat loss, this is an inexpensive and practical solution.

Replace Out-Dated Models

If your appliance is older, or if you regularly 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.

  • You may also install a control kit that allows you to adjust the functioning and temperature of the device using your mobile phone that is linked to the internet.

What temp should my tankless water heater be set at?

Asked in the following category: General The most recent update was made on February 27th, 2020.In most cases, when you buy a tankless water heater, you will discover that the manufacturer has already set the thermostat at a temperature of 140 degrees Fahrenheit for you.That is a well accepted practice.However, for the purposes of the majority of families, it is not necessary to raise the temperature to such a high level.The process of adjusting the temperature on a tankless heater is straightforward.

  • 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.
  • In the same vein, why does my tankless water heater go cold?
  • Another issue that tankless water heaters might encounter is the phenomenon known as a cold water sandwich.
  • A cold water sandwich is a plumbing phrase that refers to abrupt temperature variations that occur when your tankless water heater alternates between producing hot and cold water.

This can be caused by one of the following: a clogged water filter on the cold water entrance.Furthermore, do tankless water heaters require more time to heat up?As long as a sufficiently big water heater is installed, there should be no problems.Tankless water heaters require more time to heat water than traditional water heaters.Hot water is stored at the top of the tank in traditional water heaters, ready to be used when the tank is full.When using a tankless device, cold water enters the heat exchanger tubing and immediately begins to heat.

See also:  How To Build A Water Heater Enclosure Outside

What is the best way to raise the temperature of my Rheem tankless hot water heater?Setting the temperature on a Rheem tankless water heater is simple.

  1. Dip switches are used to control the temperature over 120 degrees Fahrenheit.
  2. If you want to modify the temperature higher than 120oF and up to 140oF, then read the following: settings
  3. ? Change the setting of DIP Switch4 to the ″ON″ position
  4. ? In order to use more than one, press the ″SW1″ button on the left hand side of the PCB. Adjust DIP Switch4 so that it is set to the ″OFF″ position once more.

What Temperature Should I Set My Water Heater At?

11th of March, 2020 Get in Touch With Us

Setting the Ideal Hot Water Heater Temperature

Are you tired of burning your hands every time you turn on the hot water in the shower?What if you’re having trouble getting a comfortable water temperature, no matter how high you turn the faucet up?These are not always indications that your water heater is malfunctioning, but rather that the temperature setting you have chosen is not optimal for your purposes.A water heater that has been installed incorrectly can have a significant influence on your life, even in areas that are not directly linked to your plumbing or heating system.In the case of a water heater, which consumes around 18 percent of the energy in your house, changing it by just 10 degrees can result in a three to five percent reduction in your monthly energy bill.

  • It can also have a negative influence on your health or the health of people who share your home with you.
  • How do you set your thermostat when there is so much riding on the outcome?
  • A definitive or simple response cannot be given; rather, part of it is a matter of personal choice.
  • But there are a few guidelines you may follow to ensure that your temperature setting is optimal for you.

General Recommended Water Heater Temperature

You can find out what temperature water should be at by visiting the Environmental Protection Agency.The optimum temperature is 120 degrees Fahrenheit.You will really save money because your water will not be hot enough to cause scalding, most small households will have adequate hot water for their needs, and reheating will not need an excessive amount of energy consumption, allowing you to save money on your utility bills.This temperature, on the other hand, is not ideal for everyone.Some homes will require it to be even hotter than this for a variety of reasons that we shall address shortly, but exercise caution when exceeding this temperature threshold.

Considerations When Choosing a Water Heater Temperature Setting

Do you have any at-risk individuals residing in your home?Those who are particularly sensitive to high temperatures may suffer serious consequences if they are exposed to overly hot water.It only takes two seconds of exposure to water at 150 degrees Fahrenheit to create third-degree burns in small neonates, and only five seconds at 140 degrees to cause third-degree burns.Temperature reduction is more safer for your infant and far more cost-effective in terms of energy use.A water heater set at no more than 130 degrees is recommended if you have a baby or any youngster under the age of three in your household.

  • Elderly homeowners should follow the same guidelines and laws as everyone else, because they are also at risk of burning quickly and suffering potentially painful injuries if they are accidentally exposed to too hot water.
  • Those who have compromised immune systems or who suffer from respiratory ailments, on the other hand, may benefit from a hotter water temperature in order to destroy bacteria while also increasing the concentration of steam in the air when bathing.
  • When dealing with these people, and assuming there are no smaller children around, we recommend keeping the water temperature no higher than 140 degrees.
  • Do you have an appliance that is energy efficient?
  • Dishwashers that pre-heat are becoming increasingly common.

Essentially, these systems take in water and then raise the temperature to even higher levels to provide an even better and more hygienic clean, all without the need for you to raise the temperature coming from your water heater.When it comes time to update or replace your dishwasher, we strongly advise you to search for one that has a pre-heat system built into it.If, on the other hand, it won’t be for a long time, you may wish to raise the temperature of your water heater to 140 degrees.It is possible to maintain the water nice and hot for your dishwasher while still keeping it safe to use for the majority of your family members if you use enough cold water to compensate for the hot water.How many people do you have living in your house?While everyone has their own temperature preferences while bathing, you can typically fine-tune them with the hot and cold water knobs on the shower head.

Those who like a hotter shower increase the ratio of hot to cold water in their shower.Showers that are chilly to the touch are preferred by those who prefer them that way.The temperature of the water that comes out of your water heater, on the other hand, will have an impact on this as well.The hotter the water that comes out of your heater, the less hot water individuals will require, and the more cold water they will need, to attain their preferred temperature.

  1. People that use cooler water heaters will require more hot water and less cold water in order to achieve their goals.
  2. As a result, people who adjust their water temperature to a lower setting will find themselves running out of hot water more quickly.
  3. If you have a large home with multiple people living in it, you should raise the temperature of the water to ensure that your hot water supply lasts as long as possible.
  4. Smaller homes with fewer occupants may get away with setting the thermostat lower since they are less likely to run out of heat in the first place.
  5. Do you require assistance with your water heater in the Los Angeles area?

The specialists at Moe Plumbing Services can help you with everything from thermostat replacement to new water heater installation.Call (818) 396-8002 today to schedule an appointment.

More on Water Heaters:

  • Six Common Problems with Your Home Water Heater
  • What Every Homeowner Should Know About Water Heater Maintenance
  • Six Common Problems with Your Home Water Heater

How to Set the Temperature on a Tankless Water Heater

To see your utility costs grow out of control is a disturbing experience.That is most likely the primary reason why some people choose to replace their water heater with a tankless model.What’s the harm in trying?Despite the high initial cost, it is ecologically friendly, very efficient, and will help you save money in the long run despite its high initial cost.Your carbon footprint will be reduced as a result of reducing your gasoline consumption.

  • However, ensuring that you have the appropriate temperature setting might be difficult.
  • Tankless water heaters typically have a default temperature setting of 120°F and will not heat the water any hotter than that temperature setting.
  • It is a safety feature designed by heater manufacturers to avoid unintentional scalding, which is especially important if you have youngsters in the house.
  • It is also a method of conserving energy that might assist you in reducing your gasoline use.
  • If you need to turn it up a notch, a couple tweaks on the control panel will do the trick.

To help you understand how to set the temperature on a tankless water heater, we’ve put together this page with instructions.

Types of Tankless Water Heaters

  • A tankless water heater can be divided into two types of systems.
  • The first is the most basic whole-house system, which warms water in a central heater and delivers it when a faucet is opened.
  • As the name implies, it caters to the entire home and is the greatest option for those who consume less water on a regular basis.
  • This has the problem of causing standby heat loss, as well as heat loss when transporting water from the tank to the tap.
  • It negates the energy-saving characteristics of a tankless water heater.
  • The second type of gadget is called a POU, which stands for point-of-use device.

Basically, it works by heating water in close proximity to the water output, such as a faucet, bathtub, or showerhead.When numerous POU devices are installed, each outlet or exit point may be controlled independently, allowing for greater temperature control.They are particularly well suited to households with daily water use in excess of 40 gallons.

  1. In the event that many water outlets are used at the same time, they are prone to creating a restricted water supply.
  2. Related: Rheem Water Heater – Troubleshooting Guide (Extended Edition)

Normal Setting Temperature on a Tankless Water Heater

  • The default temperature setting of 120°F is the standard operating temperature for a tankless water heater. It is already sufficient for a variety of home applications including as bathing and cooking. In addition, the setting will ensure that the water flowing out of your outlet is precisely correct. It is possible that the tankless unit will restrict water flow in order to achieve a higher temperature setting. As a result, the higher the temperature on your thermostat, the lower your water pressure will be. Some visitors, however, are not here only for the 120°F temperatures. Here’s how to change the temperature to anything higher than the default setting if you require it. This step-by-step guide will walk you through the process of adjusting the temperature of your tankless water heater. Although the information shown on the LED panel may differ from one manufacturer to another, the following are the main functionalities that most units have: Turn the thermostat dial on the control panel of your tank to the on or off position.
  • Press and hold the Priority Function button until it illuminates
  • Press and hold the Arrow Up button until the temperature on the display changes from 120°F to 140°F, then release the button. The figure on the screen will begin to flicker
  • this is normal.
  • Continue to press the Up and Down Arrows together until the light stops flashing.
  • Using the Up and Down arrows, adjust the temperature of the figure to your liking. Some types adjust the temperature by a 5-degree increment in each direction. Other units can be customized to a certain extent
  • Some water heaters, such as the Rinnai Tankless Water Heater, are equipped with a lock feature. If you want to use it, press the Priority and Arrow Up Button simultaneously until the LOC displays on the screen.
  • Alternatively, you can hit the Priority and Arrow Down buttons at the same time and repeat steps 4 and 5.


Can you adjust the thermostat beyond the default setting even if it seems locked?

  • What happens if you are unable to raise the temperature of the heater over its default setting?
  • The electronics within the tank holds the key to resolving this problem.
  • You may, however, require the assistance of an expert who will be able to arrange it for you.
  • When it comes to the POU device, altering the thermostat on the control panel will allow you to independently modify the remote panel next to the water outlet.
  • If you are utilizing a whole-house system, you should be aware of the possibility of scalding.
  • Make certain that the temperature is adjusted correctly, especially if you are using it on toddlers.

Is 140 degrees just right or too hot for a tankless water heater?

  • Even if the conventional tankless water heater temperature setting for domestic usage is 120°F, a temperature of 140°F is also a safe bet.
  • Some individuals are accustomed to showering at this temperature level if they wish to experience a slight temperature rise while in the shower.
  • Preventing bacterial development and keeping the body stimulated are two of the benefits of drinking green tea.
  • It is doable, but it is not recommended for youngsters under the age of four years.
  • And, even if your thermostat permits it, never exceed the 140°F temperature setting on your thermostat.
  • It’s also vital to remember that temperatures beyond 140°F are generally reserved for commercial use.

Why does it take longer to get hot water with a tankless water heater?

On-demand hot water does not always imply that you will get hot water immediately after turning on the faucet. Even if you have a POU device, it will take a few seconds for your hot water to come to a rolling boil. The waiting time for the water is still determined by the flow of water, the distance between the heater and the pipe, and the outside temperature.

Why won’t my tankless water heater get any hotter?

The temperature outside in your neighborhood may have an impact on the functioning of your water heater. It is also possible that sediment build-up or water hardness is preventing the water from heating up fast. If you are utilizing a large number of outlets at the same time, the temperature of the water will be affected as well.


  • If you need a hot water heater, the tankless choice, as opposed to a tank water heater, is an innovative and highly sustainable item for a domestic water heating system.
  • This system creates hot water on demand, which makes it extremely efficient and cost-effective.
  • Tankless water heaters have a number of advantages over traditional water heaters.
  • One of its disadvantages, on the other hand, is that it is prone to produce water temperatures that are variable.
  • Maintaining a constant supply of hot water may be accomplished by matching the size of your tankless heater to your usual use.
  • Acquiring knowledge on how to set the temperature on a tankless water heater may also be of use in resolving the situation.

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 for itself.
  • We’ll guide you through the major pros and cons of each option to assist you in making an informed purchasing decision….
  • Even while tankless water heaters are more expensive (often up to three times as much as a typical water heater), they have a longer life cycle and can drastically reduce your power bills.
  • If you use 41 gallons or less of hot water per day, a tankless hot water heater can save you between 24 and 34 percent on your energy bills compared to a storage tank heater.
  • If you use more hot water per day (for example, 86 gallons per day), they can be 8 percent to 14 percent more efficient in terms of energy usage.
  • Additionally, the life expectancy of a tankless water heater is often greater than 20 years.

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 require, how they function, and what makes them distinct from one another.When purchasing a tankless water heater, there are various considerations that must be made.We’ll go over some of these considerations later.

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 actually distinguishes a tankless water heater from a typical water heater is the fact that they may avoid standby heat loss from occurring.
  • 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 regulated by a thermostat, which allows you to alter the temperature of the water they produce more easily.
  • Another advantage is that they take up less room and are better for the environment because the rusted tank isn’t disposed of in a landfill like conventional tanks.

Your bigger, conventional heaters, with their 30-50 gallon tanks, take up a significant amount of floor area.It is possible to get containers that are 60 inches tall and 24 inches wide that store 40-60 gallons.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.

  1. The highest temperature rise achievable at a given flow rate is used to rate the performance of these tankless hot water heaters.
  2. 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).
  3. When looking for the finest tankless water heater, you’ll want to aim for a flow rate that meets your requirements.
  • 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).
  • It’s possible to see the average groundwater temperature in your region by looking at this map.
  • Simply subtract the temperature of your ground water from the temperature of your intended output.
  • The temperature of your water should be between 100 and 115 degrees Fahrenheit when it is being heated.
  • If the temperature of your groundwater is 60 degrees and you want your shower to be 110 degrees, it will result in a 50-degree increase in temperature.

Calculating Flow Rate

  • It is possible to compute the flow rate by adding up the GPM for all of the household water faucets 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.

Pre-1922 heads have a flow rate ranging from 4.0 to 8.0 GPM.A circulation system can be added to the heat source if you discover that hot water is not reaching your faucet as soon as you would like.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?

  • In order to assist you in determining the tankless hot water heater that is required for your needs, here is an example from Compact Alliance: 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.
  • As a result, you’ll need a tankless water heater that has the ability to heat at least 5.2 gallons of water per minute and can achieve at least a 60-degree increase in temperature while pumping out 5.2 gallons per minute.

How Does a Tankless Water Heater Work?

  • When you turn on the hot water tap, the water begins to heat up.
  • It is heated by a gas burner or electric components after the cold water has traveled via a pipe into the device and reached the heating element (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.
  • Heaters’ intake and output temperature measurements are taken into consideration by flow sensors, which monitor the precise flow rate as well as the temperature data.
  • This information is passed on to the temperature control unit.

Combustion gases are properly vented out of the building using a specialized and sealed vent system.Instead of having to wait for the storage tank to fill up with enough hot water, you may use a hot water heater right now.The disadvantage of tankless heaters is that their output restricts the amount of water that can flow through them.

  1. Tankless water heaters heat water at a rate of 2-5 gallons per minute on average, according to industry standards.
  2. 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.
  3. Alternatively, you may install two or more tankless water heaters, or you can build separate heaters for different items that need a large amount of hot water, to address the difficulties.
  • It is necessary to consider the fuel type, environment, local building code requirements, and safety considerations when installing these systems appropriately to ensure a safe installation.

Tankless Water Heater Pros & Cons

  • Tankless water heaters, according to the United States Department of Energy, save an average of $108 in energy expenditures per year when compared to standard tank water heaters, on average.
  • 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.
  • If your utilities are solely electric, for example, you’ll need to improve your electrical system to accommodate this.

This may be a time-consuming and expensive undertaking.Tankless water heaters might also be more difficult to install than traditional water heaters.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.

  1. 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.
  • If you need less than 41 gallons of hot water per day in your house, a tankless water heater is an excellent choice for your situation.
  • According to Energy.gov, they can reduce your energy use by 23 percent to 34 percent in your situation.

Types of Heaters

  • It is possible to purchase two distinct types of tankless heaters: one at the point of use and one for the full home.
  • 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.

When compared to point-of-use versions, which are often powered by electricity, whole-house systems are powered by natural gas or propane.

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 traditional 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, according to the company.
  • This secondary exchanger removes any excess heat from the combustion gas and cools it down to the point of condensing it.
  • It is from this process that the term ″gas condensing″ is derived.
  • They also necessitate the installation of a vertical PVC pipe and a condensate drainage system.

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. In addition, electric versions emit no greenhouse emissions and may be controlled from a distance using a remote control. You also won’t have to be concerned about floods if your tank ruptures either.

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. Please get in touch with us if you are interested in a tankless hot water heater. Our licensed professionals are available to answer any queries you may have and do the service on YOUR timetable.

What’s The Best Water Heater Temperature Setting?

  • A hot shower may receive a bad name from your dermatologist since it might dry up your skin, but many people like it for its relaxing properties! In a household where hot water is fiercely competed for among family members, or even between your washing machine and dishwasher, you may be tempted to raise the temperature of your hot water heater. But at what point does it become too hot? There are differences of opinion between the Department of Energy and the industry. Scalding can occur at temperatures below 120 degrees Fahrenheit, although 140 degrees Fahrenheit is the normal default temperature. Any temperature below 120 degrees Fahrenheit, according to the majority of experts, increases the likelihood that germs from stagnant water, such as the bacterium legionella, which causes Legionnaire’s disease, would form within your water heater. Whatever temperature setting you choose, it’s vital to remember that the kind of pipe used, how the water is heated (gas or electric), and whether your system is tanked or tankless have no effect on the temperature you choose. There are, however, a number of elements to take into consideration when determining your thermostat setting: Stick with 120°F if you have small children and/or the elderly in your house who are prone to third-degree burns in seconds, or if you are a single occupant owing to the decreased demand for hot water in your home.
  • Consider 140°F if you have an immunocompromised individual in your home, a dishwasher that does not pre-heat, or a multi-occupant household owing to the increased need for hot water.
  • But what about the expenses of energy?
  • We get what you’re saying!
  • Water heaters account for around 14-18 percent of the total energy consumed by a residence on a typical day.
  • Furthermore, it may be tempting to lower the temperature in order to save money.
  • It should be noted that a 10°F decrease in temperature is related with a 3-5 percent reduction in energy use.
  • Legionella, on the other hand, can live at temperatures as high as 122°F.

So make sure to strike a balance between your risk tolerance and your energy consumption targets!If you’re still on the fence, play around with it.Many hot water heaters are equipped with a temperature control dial.

  1. If yours does not, run the water for a few minutes and use a thermometer to check the temperature of the water thereafter.
  2. Start with 120°F and gradually increase the temperature in small increments until you get your desired result.
  3. All things considered, it is possible that your house is not as simple as ″simply″ setting a temperature and forgetting about it.
  • A water tank booster may be an appropriate option in houses where the requirement to maintain a greater hot water temperature for health safety must be balanced with the need to reduce the danger of scorching.
  • To inhibit pathogens from growing in your tank, it retains the temperature at 140°F while mixing with cold water to provide a lower temperature at the faucet.
  • Alternatively, you could live in a house where, no matter what temperature you select, hot water takes an inordinate amount of time to reach the faucet (or a certain tap farthest from the hot water heater).
  • A hot water circulating system circulates hot water gently through the pipes so that you are not forced to wait.
  • Whatever you choose, we’re only a phone call away if you’re having issues with your hot water!

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