How To Turn Off Tankless Water Heater

Tankless Water Heater and turning off main water supply

Tankless/combi will simply not start if there is insufficient flow (this is clearly stated on the tech label), and the minimum flow required to allow fire to light is often about 2L/min, which is inherent in their mode of working. The majority of them employ a microswitch to sense the flow and a temperature sensor to alter the flame, while some just monitor the flow and modify the flame in response. It is not necessary on DHW since some have a minimum pressure sensor and others do not. answered Mar 6, 2019 @ 8:38DDSDDS2,0597 silver badges and 14 bronze badges were awarded on this day.

Having said that, turning off the water supply might cause changes in the pressure in the system as well.

  • Some are equipped with flow switches, while others are equipped with differential pressure switches. However, both are accomplishing the same thing: using no water and no heat. My first encounter with one on the water’s edge was on March 6, 2019 around 5:30. They must be able to deliver on their promises. Navien is the only software I use. They make use of a flow transducer/hall effect sensor to do this. I’ve made a few modifications. But I’ve put in hundreds of units throughout the years. In the garage, I’m still dealing with a defective sensor. I attach it to a 5vdc power source and an LED while blowing into it, and it knocks my kids’ socks off as they watch the light flicker in delight. Is it a variable pressure transducer, or something else? Or is it simply a switch with the gas being throttled by another sensor? On March 6, 2019, at 5:47 p.m. On some systems, it may be both at the same time.

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It is important to note that a tankless water heater only heats the water you use, as opposed to a traditional water heater, which continuously heats stored water in a tank. Tankless water heaters are available in two configurations: whole-house and point-of-use. A point-of-use water heater simply provides hot water to a single faucet or zone. Gas models are also available for point-of-use models, which are often powered by electricity. Changing the temperature of the water can be done from the face of the unit on both whole-house and point-of-use models, and some units even include extra capabilities that enable you to temporarily override the water temperature.

Electric Tankless Water Heater

  1. Identify and shut down the circuit breaker that supplies electricity to a small electric tankless water heater. Start by turning on all of the hot water taps that are served by the unit. Opening hot water faucets that are not linked to the water heater is not recommended. Allow the faucets to run for about 1 or 2 minutes to clear any air that may have accumulated in the lines. Activate the circuit breaker for the tankless water heater and close all of the faucets. The temperature of the water may be adjusted by turning the temperature dial. Despite the fact that you may have various temperature options to pick from on the dial, the United States Department of Energy recommends adjusting the temperature to 120 degrees Fahrenheit to avoid scorching and to lower your energy bills. Inspect the water shut-off valves linked to the tankless water heater’s intake and output water lines to ensure that they are not clogged.

Gas Tankless Water Heater

  1. To turn off the power to your gas tankless water heater, turn off the circuit breaker that supplies it with electricity. Some versions feature power buttons that allow you to do this function right on the unit itself. Despite the fact that gas warms the water, electricity is required to run the control panel and the ignition system. Locate the gas shut-off valve that supplies gas to the device and close it. Rotate the valve counter-clockwise to the “Off” position
  2. Wait 5 minutes to allow any gas to escape from the unit before turning it back on. Immediately evacuate the premises and contact your gas provider from a neighbor’s residence if you detect gas after 5 minutes. Please do not make calls from your house. If you do not detect any gas, you should proceed with starting the unit. Turn the gas shut-off valve counterclockwise to the “On” position until the gas is turned back on. Reset the power breaker if necessary.

Should You Turn off a Tankless Water Heater When Going for Vacations ?

The use of air conditioners When you go on a vacation, you have the opportunity to unwind and enjoy your time before returning to your regular responsibilities and responsibilities. It is necessary, however, to double-check that everything is safe before leaving the house for several days. Whether or whether you should turn off your tankless water heater while on vacation is a valid question. The answer to this question is, without a doubt, that you should. After all, failure to do so may result in floods, which will cause extensive damage.

However, there are also more benefits to shutting off your tankless water heater while you are away for the weekend.

Benefits of Turning Off Your Tankless Water Heater While on Vacation

Every time you think about your tankless water heater, which you failed to switch off, you are likely to experience uneasiness. Imagine the degree of the destruction that it is capable of causing, and you will not be able to rest easy. Whenever you leave the house, whether for a short period of time or for an extended period of time, it is essential to make certain that everything in your home is secure. This provides you with the much-needed peace of mind while you are away on vacation.

Vacations are intended to be a time of rest and relaxation for both the mind and the body. As a result, make it a point to plan ahead of time. When you do this, you will be better able to deal with any challenges that may arise during your leisure time.

When you forget to switch off your tankless water heater before leaving for vacation, you put yourself and your family in a lot of danger. It is possible for your tankless water heater to leak while you are away from home, resulting in flooding and water damage to your home. It can also cause harm to your personal belongings, such as valuable papers and electronic goods. It may be quite expensive and time-consuming to replace them. Furthermore, depending on the level of damage, it might take a long time before your home is restored to its pre-water damage condition.

  • It will be in the last phases of development before becoming operational.
  • When your tankless water heater reaches an advanced age, it is more prone to overheat and burn out.
  • It’s possible that you have insurance for your tankless water heater system.
  • You may be surprised to hear that there are several exceptions to the insurance coverage for your tankless water heater, some of which will prevent you from receiving full compensation in the event of an accident.
  • When you return home after a well-deserved vacation, you’re almost always in a good mood.
  • This may be extremely stressful, not to mention inconvenient, in the long run.
  • Instead of returning from your vacation feeling rejuvenated and re-energized, you’ll find yourself becoming even more anxious as a result of all the work that has to be done.

Should you turn off the tankless water heater when on vacation?

When you turn off your tankless water heater while you are away on vacation, you are likely to receive a variety of benefits. Due to the fact that your tankless water heater is subject to some risk exposure, it is recommended that you take measures at all times. There are plumbing issues, the incidence of which is questionable in some cases. For example, some little leaks that may go unnoticed at home may turn out to be explosive when you depart for your vacation since they have accumulated over time.

Useful Tips for Turning Off Your Tankless Water Heater

In most cases, unless you forget, turning off a tankless water heater in your home is not a difficult task. If you are unable to remember to do it on a regular basis, you will need to write it down in your notebook under the heading “things to do everyday.” In the event of a plumbing emergency, you must be aware of where the main water supply valve is located in your home. The other critical step is to ensure that your valve is fully functional before proceeding. Before you depart, you must turn off the water and make sure that the water does not continue to run.

If you have any reason to believe something is wrong, contact your plumber for additional investigation. After determining that your valves are in proper functioning order, you may depart certain that the only water leakage that might cause harm is a clogged drain.

Does shutting off a water heater damage it?

In most cases, cutting off the heat source for your tankless water heater will not result in any noticeable consequences. When you are taking a break, it is ideal if you turn off your water heater as well as the main water supply.


Relaxation would be preferable when on vacation, if at all possible. The greatest time to unwind your mind, body, and soul is now. Get adequate sleep and take pleasure in every minute before getting back to your hectic routine in the morning. It is possible to lessen the number of things you have to think about while on vacation by turning off the water heater. This will enable for you to fully immerse yourself in your vacation experience.

Call Smile HVAC?

If you want assistance with the maintenance or repair of your tankless water heater, you can always rely on Smile HVAC to provide assistance. You can be confident that your water heater is in capable hands because of their extensive experience and knowledge of everything HVAC-related.

5 Simple Steps to Turn Off Water Heater

Gas or water leaks are some of the things that might cause the most anxiety in a person. However, if you know how to switch off a water heater, you won’t have to worry about this all of the time. When you hear your digital alarm go off, now is not the moment to worry or do anything stupid. Even before you hire a plumber, you must switch off all of the utilities to prevent a gas or water leak from spreading.

How to Turn Off Water Heater

Heat exhaustion, unusual noises, and other warning signals indicate that you are in danger, and you must take action immediately. So, if you want to learn how to switch off a water heater, then follow these simple steps: 1.

Step 1. Disconnect from the Power Source

The first step is to locate your water heater’s power source and disconnect it from the grid. If there is an electric unit, make certain that the circuit breaker is turned off before proceeding. When dealing with the gas unit, look for the dial that is next to the thermostat and turn it in the other way.

Step 2. Turn the Water Off

This procedure should not be performed until you are certain that the electricity connection to the water heater has been switched off fully. If you have an electric tankless water heater or a gas tankless water heater, they both have numerous types of handles to choose from. Some handles are circular, and all that is required to switch them off is a little rotation to the right of the handle. With this operation, you allow cold water to flow into the sink and tubs, and hot water will no longer be available to those fixtures.

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Navigate to a valve near the meter and flip it in the other way by removing the box and turning it back.

Step 3. Carefully Drain the Water in the Tank

Check the bottom of the tank to see if there is a place where you can attach a hose to drain the water. Insert the hose’s other end into a floor drain or a bathtub until all of the hot water has been drained. To find out if there is any special advice concerning safety when draining water, carefully read the product handbook. The first step in figuring out how to switch off a hot water heater is to cut off both the electricity and the water supply.

Once this is completed, you will be able to reduce any possible risk that leaks or a faulty propane gas water heater may provide. When draining the tank, use extreme caution to prevent splattering hot water on yourself.

Step 4. Label Your Circuit Breaker

It is possible that the content of your circuit breaker is complex and ambiguous. This will need the use of labels to ensure that you are aware of the original position of each component. In the event of an emergency, and you are forced to turn off the power totally, those labels will be quite useful. If you have a circuit breaker that has already been labeled, carefully inspect each component to discover its purpose. You don’t want somebody to assume you shut off the electricity when you actually did not.

Step 5. Practice Shutting Off Water Heater

When their heater leaks or their alarm goes off, the majority of individuals worry and get befuddled. The only way to avoid this confusion is to be aware of how to switch off the water heater in advance of when it is needed. Maintaining the practice of emptying your water heater every six months will help you become more familiar with the procedure. Make a practice of turning on and off the hot water heater supply that runs throughout the entire house. Become adept at opening the valve carefully, since twisting it too rapidly might exacerbate the situation.

This understanding is also applicable when it comes to cutting off the water supply to all of the appliances in your home.

How to Turn Off a Gas Water Heater

If your home is equipped with a tankless gas water heater, you must be familiar with how to turn off a Gas water heater. To have it done correctly, follow these simple steps.

Step 1: Turn Off the Water Heater Valve

You will see a red or black button on the front of the tank if you look closely. These buttons are sometimes buried under insulating materials, and you must remove the insulating material in order to show the button. The switch should be moved or turned from the “on” position to the “off” position. When you turn off the heater, the pilot light will cease operating and the burner will stop heating. Remove the heat shield and inspect the inside for evidence of heat or flames before replacing it.

Step 2: Turn Off the Line that Supplies Gas

If you wish to go outside and hear the heater hissing, turn off the gas line valve before you leave the house. Simply go to the heater and turn off the gas valve that is situated on the gas line near the heater. The lever should be perpendicular to the gas line when it is fully extended. If you can’t locate any valves, follow the gas line until you come to a handle that functions as a switch for the light. Gas line valves are usually straightforward to find, and you won’t have to spend much time looking for them.

Step 3: Shut Down the Water Heater

If you’re going to be away from home during the winter, make sure you drain the water from the tank to prevent it from freezing. Turn off the water heater and leave it off for 12 hours to enable the water to cool and prevent scalding from occurring. You drain your tank, be sure to do the following: Make sure you have a bucket underneath the pressure release valve so that the water flows directly into the bucket. Open the relief valve to enable the steam to escape, and then gently release the lever to close the valve completely.

Pull the hose to the specific location where you want the water to drain from. In most cases, the draining region should be located at a higher elevation than the water tank’s location. It may be beneficial if you have a garden.

How to Turn Off an Electric Water Heater

When it comes to turning off your electric water heater, the five actions listed below are helpful. Follow the instructions and you will discover how to turn off your water heater in your residence.

Step 1: Turn Off the Breaker

Locating the two-pole circuit breaker is the first step in figuring out how to switch off an electric water heater. It has a current of around 30 to 50 amps and is generally labeled. Even if you have turned off the electric water heater, it is always a good idea to cut off the electricity at the breaker panel. If the breaker is equipped with lock-out lugs, secure them to the breaker. If you are concerned that you will make a mistake, identify the breaker with paper tape to prevent this from happening.

They should refrain from getting close to the service panel or the water heater until you are finished with them.

Step 2: Put a Tag on the Breaker

Safety regulations require that you label everything you are working on in order to prevent anyone from being injured. When working with electricity, it’s best to keep the area closed off to prevent prospective victims from entering the area. Mark the location and the equipment to serve as a warning to anyone who might unintentionally walk too close to the site. When it comes to the home, simply turning off the breaker isn’t adequate because everyone is exposed to the same hazard. The use of identification and restrictions to notify family members about potential threats would be extremely beneficial.

Don’t take the concept of safety lightly because even a single electrocution can result in death.

Step 3: Cool Off the Water

Before you begin any repairs, you will need to let the water in the tank to cool down. It is advisable to switch off the heater in order to prevent the water from being overheated. Set aside some time for the water to gently and gradually cool on its own. You should avoid attempting to chill the water by adding cold water to the container. Simply turn on a faucet in your home and let it to flow for an extended period of time. After some time, the water should feel lukewarm, which indicates that it is okay to begin your repairs.

Before using hot water for showering, laundry, or dishwashing anywhere in the house, wait one hour.

Step 4: Turning Water Off

Water tanks should always be equipped with a shut-off valve located on the outlet outside the home’s perimeter. The tank’s placement prevents it from accumulating an excessive amount of internal pressure. When working on the hot water tank, make sure to turn off the cold water supply. If your tank has two valves, locate the one that allows cold water to enter and shut it off completely. When facing the tank, the valve is normally on your right as you stand facing it. Normally, two valves should not be found on a single supply line, therefore use caution when doing this task.

Feel the pipes with your hands to see whether there is any water flowing through them. The cold line is used for cold water, while the hot pipe is used for hot water, as the name implies. Alternatively, you might choose to switch on a water faucet in your home. The one and only

Step 5: Drain the Hot Water Tank

As you learn more about how to switch off the hot water heater supply, you’ll come across a few interesting facts. It is possible to carry out various chores without having to empty the water tank. While changing or testing the thermostat or monitoring the power supply unit, you can leave the tank at its maximum capacity of 80%. Draining the water is required before doing activities such as removing or replacing an element or flushing sediments. The accumulation of deposits in the bottom part of the tank might have an impact on the heating of the water in that section.

Wrap Up

Clearly, shutting off water heaters of any sort has never been as simple as it is right now. The only prerequisite is that you know how to switch off your water heater. Yes, it is as straightforward as that. In the comments area, please tell whether your experience was similar or different from mine. Thanks for reading. We’ll be delighted to benefit from your first-hand knowledge. Continue to keep in mind the following summary of the processes outlined in this article:

  • Turn off the water heater and the circuit breaker
  • Turn off the lights and radio. Take care of your repairs before re-connecting the water.

Emergency Water Shut Off

Do you have a leaking water pipe? By shutting off the water, you can prevent or reduce water damage. There are various locations where you can switch off the water: A leaking water heater is one option, but so is a leaking plumbing fixture, or the main water line to the home is another. Depending on where your water leak is located, you should follow the steps in this guide accordingly. We’ve also included an instructional video to lead you through the process for your convenience.

How To Turn The Water Off At The Leaking Water Heater

  1. To turn off the water heater, turn off the gas or electricity supply.
  • The off setting is reached via clockwise rotation of a knob on the top of a gas water heater’s thermostat. The water heater’s thermostat is positioned near the bottom of the appliance. For electric water heaters, go to your circuit breaker panel and locate the breaker for your water heater
  • Turn it to the off position. For gas water heaters, use the same procedure as above.
  • Turn the lever on the water shutoff valve counterclockwise until the water stops flowing. This valve is normally found on top of the water heater, on the right side of the cold line
  • However, it can be found anywhere.
  • Drain the water heater if it is necessary to avoid water damage to the house.
  1. Connect a garden hose to the drain faucet, which is situated at the bottom of the water heater, and let it drain. Extend the hose to a lower area where hot or corrosive water will not cause harm. Drain the water heater by turning on the drain faucet. As water drains from the home, open a hot water faucet in the house to allow air to circulate into the water heater.

How To Turn The Water Off At The Leaking Plumbing Fixtures

  1. Then, at the leaky plumbing fixture, turn off the water supply by turning the lever on the water supply shut off valve clockwise until it comes to a complete stop. This valve is often found on the flex line or feed pipe that connects to the plumbing fixture in which it is installed. It might be directly behind or directly below the fixture (e.g., toilets, sinks, washing machine)
  2. It could also be directly above or directly below the fixture.
  • In the case of leaking sinks, turn off the hot and/or cold water pipes as necessary. Turn off the water supply line if your toilet is leaking or overflowing. If your washing machine, dishwasher, or refrigerator is leaking, switch off the feed lines first.
  1. In certain circumstances, such as when the supply valve is not easily accessible or when the leak is located before the shut off valve, you will need to switch off the main water supply
  2. However, this is not always necessary.
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How To Turn The Water Off At The Main Water Supply Shut-Off

Several choices are available to you when it comes to cutting off the main water supply. Decide on the choice that best fits your needs and circumstances.

  • Then, turning the main water valve in a clockwise manner until the water stops flowing, turn it off again. When installed in front of the home, this valve is often situated slightly below the garden hose faucet. After turning off the main water supply, open an outside faucet to enable the pressure to be alleviated and any surplus water in the system to drain outside
  • This will help to prevent flooding.
  1. Remove your home’s main water supply from the city, which is normally located underground near the street and may be reached by turning off the water meter box. Access is granted with the use of a street key
  2. Alternatively, you may contact your local water department or our helpful staff for assistance.

How To Turn Off The Gas Supply

Is there a gas leak in your home? In order to assist you in spotting leaks, the gas provider adds a particular chemical to the natural gas that you are using. As a result, if you smell “rotten eggs,” you are most likely experiencing a gas leak. If you are near a gas-powered fixture, check to see that the pilot light is turned on. You may check for leaks in the lines if the light is on by spraying them with a mild soap solution to pinpoint the area of the leak and turn off the light. The place where the leak is occurring will bubble.

Decide on the choice that best fits your needs and circumstances.

Should I Turn Off the Water Heater if the Water Is Off?

When you turn off your water line, cold water will cease flowing into your house completely, and if your water heater has a tank, the tank will stop replenishing with cold water when the water line is turned off. In the event that your water is turned off for an extended length of time and you use a lot of hot water, you run the danger of sustaining catastrophic harm. If your water is shut off for a lengthy period of time, such as during a vacation, you should switch off your water heater. If you have a tank-type or hybrid water heater, you should not turn off your water heater.

Keep your water heater turned on until the cold water begins flowing again if you are shutting down only for a brief period of time. This page will cover the many types of water heaters, as well as how they are connected to a water line.

How Water Heaters Work

Even in the summers, the water that enters your home through a water line and the related pipes is normally chilly or cool to the touch. In order for you to have warm water in your house, the water must first be heated before it is delivered through the plumbing system. Water heaters are often placed in the basement of a house and require either a gas or an electric heating unit to operate. There are four fundamental types, each of which performs the same purpose in a slightly different way than the other three types.

Tank-Type Heaters

Tank-type water heaters are the most common form of water heater on the market. Essentially, it is comprised of an insulated tank filled with water that is placed above or beside a gas or electric heating device to provide warmth. The cold water enters the tank from the bottom and rises when a gas flame or an electric element warms the water to the surface. A pressure relief valve prevents the heater from being overly pressured if the pressure rises too high. When a hot water appliance or faucet is required, the water tank pumps hot water out of the tank through the top of the tank and replaces it with new, cold water at the bottom of the tank, as shown.

Tank-type heaters also use energy continually in order to keep the water in the tank heated even while the heater is not in use.

Tankless Water Heaters

Because they do not store water, tankless water heaters are significantly smaller than traditional tank-type heaters. It instead waits for a hot-water tap or appliance to demand warm water before activating an electric element or gas burner and drawing cold water directly over the heating mechanism and to where it is required. Despite the fact that tankless water heaters last far longer and provide an unending supply of hot water, they are significantly more expensive to acquire, install, and maintain than tank-type water heaters.

Hybrid Water Heaters

However, they consume more energy than a tankless water heater, which is the most energy-efficient option available. On the surface, the hybrid works by storing water in a tank coupled to an air compressor, which uses air temperature to catch and transmit heat to cold water instead of a gas flame or electrical parts.

Point-of-Use Heaters

These tiny and compact heaters are typically used in conjunction with the main water heater to provide hot water on demand. Point-of-use heaters are often put at fixtures that are far away from the main heater in order to prevent the need to run the water and wait for the water to warm up before using it. These electrically driven machines heat the water instantly, so removing the need for a waiting period. Point-of-use water heaters often last a long time and can be installed quickly and simply, but they cannot be used to replace a home’s primary water heater due to their smaller size.

How the Home Water Line Works

You may find the location of your water main by looking for a 12″ to 112″ pipeline that runs near your water meter if your home is linked to the city’s water system. The presence of an emergency shutdown valve, which would cut off all water flowing into your plumbing system, is also possible, although it is not guaranteed. It is possible that your home is connected to a water well, in which case your system may appear somewhat different, but the function will be the same. The water that enters your house through the main water line has been pressured, allowing it to move through your pipes against gravity, saving you time and money.

This implies that water may flow very rapidly, whether it comes from a faucet, a hose, or a burst pipe in the event of a disaster such as a flood. If you do have a damaged pipe, it is critical that you have it repaired as soon as possible.

The Water Line and the Water Heater

It is important to note that the water entering your home is chilled and passes through cold water pipes. An inlet line from the water heater is connected to one of these pipes. Your water heater is also connected to a hot water line, via which water is sent to various appliances and faucets. Whenever water is required, it is fed into and out of the heater.

What Happens to the Water Heater When Your Water Is Turned Off?

Cold water ceases flowing into your plumbing system from the outside when you turn off your water, which means that your tank-type or hybrid heater will no longer be able to replenish with more water. If the water is turned off for a lengthy period of time and the tank is completely depleted, it is necessary to turn off the water heater to prevent damage to the tank and other components. Unless your water heater is nearly full or completely full, you should not be required to turn it off during a short-term water disconnection.

When to Turn Off Your Water Heater

In the event of a plumbing emergency, such as when your cold water line loses pressure and fails to fill the water tank, or when your water tank empties for any other reason, it may be essential to turn off your water heater temporarily. In other situations, such as in the case of a leak, shutting off your water heater may be beneficial but not required, as in this example. Leaks can occur for a variety of causes, including the following:

  • The following factors contribute to high pressure and high temperature: improper drainage, old age, and damaged tank.

In order to save money by not operating the water heater while it is not in use, it is preferable to lower the temperature of the water heater rather than totally shutting off the system. Turning back on a water heater may be a challenging task, and you may find yourself without hot water for a longer period of time than you’d prefer. You should proceed with caution and ensure that you are familiar with the components of your water heater before making any alterations if you decide to turn off your water heater.

  • The shutdown valve, which is normally positioned outside and above the water heater, is responsible for stopping the flow of cold water into the device. The drain valve is often found towards the bottom of the tank and is responsible for emptying the water and sediment from the tank. Using a pressure release valve, you can ensure that the pressure inside the tank stays below acceptable limits. If you are concerned about an empty tank following a water shutdown, the heating mechanism, which may be either gas or electric, is the most critical portion of the tank to switch off.

In order to switch off your water heater, follow the steps outlined in the video below:


In the majority of circumstances, you will not need to turn off your water heater if the water is turned off. The water heater must be turned off only in the unusual event that you have had your water cut off for a lengthy period of time and have used up all of the water in the tank of your water heater. Call a skilled plumber whenever you’re in doubt.

How to Turn Off Your Water Heater

Whatever the situation, whether you have a water leak, a gas leak, or the pilot light goes out, it’s a good idea to be informed of how to properly switch off your hot water heater. It is critical that the water heater is turned off before commencing any sort of maintenance on it. When there is easy access to the rear settings and the supply pipe, the technique for turning it off is usually straightforward and straightforward. 1. First and foremost, you must find the water heater. The majority of the time, they may be discovered in utility closets or in the garage or attic.

2. If you have a gas water heater, the first step should be to locate the temperature dial, which is normally located in the bottom of the tank near the front. Once you’ve located it, turn the dial all the way to the right.

Why a Tankless Water Heater Suddenly Shuts Off We’re the experts

The tankless unit is most likely not malfunctioning if you’re the second person to enter the shower shortly after the first person’s shower. You just receive the hot water that was left over from the previous person’s shower when you first turn on the water. So when the remaining warm water is exhausted, cold water is forced through until the hot water that YOU put on has had enough time to reach the shower. In most cases, the length of the pipe that hot water must travel through to get from the tankless water heater to the bathroom determines how long it will take.

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Tankless “on demand” Does NOT Mean “Instant” Hot Water in a Large Home

In other words, don’t mix tankless water heaters that provide “on demand” hot water with water heaters that provide “immediate” hot water. Yes, the tankless water heater is programmed to turn on whenever a hot water faucet is turned on in the house. Although the hot water must transit through the water pipes before it can be delivered to its final destination, That can take a long time in a large home when the shower is placed a great distance from the garage (where the majority of water heaters are installed).

Simplest Remedy for Hot-Cold-Hot in Second Person’s Shower Works but Wastes Water

The most straightforward solution, of course, is for the second person to simply wait after turning on the hot water until the residual warm water and cold water that has been forced through the pipes has turned hot once more. Yes, this is a waste of water. As a result, it is not ideal, particularly in our region where water is both scarce and expensive.

Option2 Adding Recirculation Pump System to Tankless Saves Water and Provides Instant Hot Water

It is also possible to connect a hot water recirculator (also known as a circulator) to your tankless water heater as an alternative solution. Additionally, if your circulator does not have a timer, you’ll need to connect it to a timer. This is due to the fact that tankless water heaters are not intended to operate constantly. Water heaters that use circulator pumps perform better than those that use standard tank-style water heaters. Furthermore, because the primary benefit of tankless technology is energy savings, having it run continually would negate the purpose of the technology.

Furthermore, if your property was not initially constructed with return pipes for a hot water circulation system, you will either need to invest in new plumbing or utilize your cold water line as a return.

How a Hot Water Re-circulator System Works

This system works by pumping hot water from the water heater out through pipes to each hot water fixture and then returning the water heater back to its original location. It does, however, require a return channel to the water heater in order to re-circulate the hot water.

(You may learn more about hot water circulation systems by visiting this page). Installing new pipes for the return loop back to the water heater is the most effective method, although it is more expensive and not always practicable.

Re-circulator Retrofitting Requirements for Hot Water Return Loop Using Cold Water Line

The majority of people choose to use the cold water line as a return channel since it is less expensive than installing new return pipes. Specifically, a thermostat and valve are installed on the cold water pipe leading to the farthest fixture (usually a bathroom under the sink), which serves as the starting point for the return loop, which terminates at a valve installed on the cold water pipe leading to the water heater’s cold water inlet. In addition, we must install buttons or switches at each hot water outlet to allow us to remotely start the timer, which will then turn on the circulator pump to save energy.

In order for the second person to use the circulator, he or she must first activate the timer by pressing a remote button or switch nearby.

Cold Water When Turning on Hot Tap With a Retrofitted Cold Line Return Loop When The Circulator Pump is Off

You may get cold water if you switch on a hot water tap or shower without first engaging the circulation pump. This is due to the presence of a retrofitted cold line return. This is due to the fact that water goes down the path of least resistance. As a result of the pump being turned off and not able to force water through the tankless heat exchanger, there is higher resistance to water passing through the water heater. What should I do?

  • Check to see that your circulator pump is operational if cold water is coming out of a hot tap when it should be hot
  • The majority of circulator pumps are equipped with a check valve, which prevents water from flowing backward. It is possible for the check valve to become stuck in the on position at times. Make use of a screwdriver or small tool to tap on the pump to break it free, allowing the blocked check valve to be released and moved to the off position.

Other Potential Surprises With Cold Line Return Loop When Circulator Pump is Off

Showers that are equipped with a mixing valve and independent volume controls may occasionally provide a blast of cold water as an unexpected bonus. If you have an old-fashioned bidet with a volume control and a diverter, you could experience something similar. A shower in another bathroom can be fed by a combination of hot and cold water from the cold side of the faucet, which then feeds the hot tap from the cold side. The capacity for hot water to go through a two-handle valve in your home that has been capped with both the hot and cold water turned on allows hot water to travel through the valve and into the cold side of your plumbing system.

One of my clients had removed a washing machine that contained materials that were no longer needed.

Tankless Requires at Least Half Gallon of Water to Turn On

Because a tankless water heater requires at least a half gallon of water to turn on, don’t be shocked if it doesn’t turn on during periods when you only barely turn on the hot water.

Other Reasons Why a Tankless Water Heater Suddenly Shuts Off

Tankless water heaters, like the majority of high-end products, require professional installation and maintenance. They will ultimately develop difficulties if they are not properly fed. Some of these issues can lead to instances in which hot water is turned off without warning. In this section, we’ll go over some of the various reasons why a tankless water heater could stop down abruptly. But let’s look at two of the most common installation and maintenance issues that contribute to the off-and-on hot water phenomenon for the time being.

Mineral Deposits Inside Tankless Water Heaters Need Flushing Out

Tankless water heaters require frequent cleaning to remove the mineral deposits that accumulate inside the heat exchanger and prevent the heater from overheating. Routine maintenance must include descaling, which is a key step. In any other case, the mineral deposits that have accumulated will prohibit the water heater from operating efficiently. It is possible that this will cause the tankless water heater to go off abruptly. Eventually, if the minerals are not cleaned out, they will physically eat away at the heat exchanger, causing it to leak and limiting its useful life significantly.

More information about flushing tankless water heaters may be found here. As a reminder, if you have a water softening system installed in your tankless water heater (learn more about the advantages of installing a water treatment system), you will not need to flush it as frequently.

A Recent Example of Another Tankless Water Heater That Was Never Flushed

Consider the following example, which came from a recent customer phone call: The client complained that their tankless water heater would frequently shut down in the middle of a sower. “Can you tell me when the last time it was flushed?” we inquired. ten years, which is the same age as the water heater, was the response. We were a little shocked that their tankless water heater hadn’t totally deteriorated and began leaking when we first received the news. As a matter of fact, a previous client who had neglected to cleanse their tankless water heater experienced the same problem.

As a result, we connected the pump to flush it.

This indicated to us that water was not passing through the fittings.

And it’s at this point that we

Tankless Water Heater Not Installed Properly – Used Dielectric Unions

Mistakes are notorious for taking a long time to manifest themselves. This is an illustration. Dielectric unions were utilized to connect the tankless water heater’s fittings when it was first installed, and they are still in use today by the manufacturer. This is a problem because dielectric unions are designed to be utilized when joining metals that are not similar in composition. For example, if you’re connecting a galvanized pipe to a copper pipe, you’ll need to use dielectric fittings to link the two pipes together in order to avoid corrosion caused by electrolysis from occurring.

In reality, it was these dielectric unions that caused the corrosion in the first place.

Brass fittings, rather than dielectric unions, should be used instead.

Can I unplug my tankless water heater?

Asked in the following category: General The most recent update was made on the 19th of June, 2020. The tankless heater just takes a few seconds to empty, after which you simply disconnect it. These devices automatically shut off if there is too much scale accumulation in the pipes, or if the aerators in the faucets and showerheads get blocked, or if a turned-down faucet decreases waterflow to around 0.3 gpm. In most cases, unless you’re going on a month-long or longer trip, you shouldn’t switch off your water heater.

By continually turning off and on your water heater, you will exacerbate the situation.

Tankless water heaters provide an infinite supply of hot water while taking up less space, posing a lesser danger of leaking, being safer, and having an overall lifespan that is substantially longer on average.

The most significant downside of tankless water heaters is the high initial investment required (both for the device and for installation).

Tankless hot water heater during winter when water shut off

Thank you for the reference, however I had already read it before commenting, and my issues remained unanswered. According to the manual: “NO FREEZE PROTECTION exists if the Rinnai water heater is removed from either the electrical or gas source, or if an error occurs that prevents the water heater from operating correctly. Only when the electricity, gas supply, and standard water heater operations are all enabled can the water heater be protected from freezing. If you predict cold temperatures when either the power or gas supply is disrupted, you must totally drain the water heater’s reservoir.” I’m still not sure whether the gas and electric have to be shut off in addition to the water.

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