Should I Turn Off Tankless Water Heater If Water Is Off

As the name suggests, water heaters are used to fulfill the purpose of warming up the water instantly as there is no tank in there to store water. By that time water hearers have developed many qualities and improvements.

The ideal heater can be the one that gives you instant warm water as soon as you pass the water from it. Many large heaters have almost that capability. They only supply hot water when needed.

Because there is no option to store water in a tankless water heater many users ask the same question should I turn off tankless water heater if water is off? and that’s a valid question to ask. To answer it we have briefly explained below if you should turn off your heating unit or not when the water is off.

Should I Turn Off Tankless Water Heater If Water Is Off?

Many people ask this question: Should I turn off tankless water heater if water is off? Well, it depends. There are many scenarios when you should turn off your water heater, and sometimes it does not even make much difference whether you keep it off or turn it on.

First of all, the most important and necessary thing. Considering going on an extended vacation, you should turn off all the essential electrical appliances before leaving. Do not forget to turn off your heater when it is or will be empty for a while.

The advanced water heaters keep the cold water on hold and convert some of it into hot water and allow it to flow. If something happens and it loses control of the cold water, you will be getting the hot and cold water at the same time. Indeed, you must not have paid to experience that.

If your water heater lacks water, it is better to turn it off. The consequence will be far worse and might result in a significant water shortage. If you find this condition, turn off your water heater.

How They Function

They do not have a tank in which they can store the hot water already. When you move the tap of hot water, it starts supplying cold water in the pipeline. It works as a burner or electric reason to warm the water as much as you turn your tap.

Tankless water heaters are innovative forms in which you do not deliberately wait for the water to fill in and get warm. It gives you instant process and hence the practical outcome. In a minute, they supply an average of 2-5 gallons of water. The only limitation that you might face is the lack of hot water usage at more than one place simultaneously.


Should I turn off the tankless water heater if the water is off? 

Without sufficient flow, your tankless water heater would not just start. The flow must be equal to the minimum length of 2L per minute. They sense the flow of water through their encrypted microchip. Some other ones use low-pressure sensors. So, there won’t necessarily need to turn off your tankless water heater.

Putting your tankless water heater will cause no harm. If you are dealing with a plumbing problem, you turn it off, and there will not be any contraction or expansion in the water. If it is related to the water heater and you are avoiding any water wastage. Just make sure there is not any gas leak or electricity shock accidents happening sources.

You have the option to put it on, but it would not be recommended. If you are using it regularly, then putting it off has no point. But when you want to turn it off for a short period to fix your house’s plumbing issue, turn your burner from on to pilot or lower your thermostat.

After you are done fixing it, take it back to the previous point. But when you are going out for a vacation, do not take any risks. Switch it off with everything else. Put the thermostat to the lowest and turn the burner off, not pilot this time.

Yes, turn it off in the specific scenarios. Use it daily, but when dealing with plumbing problems and being afraid of losing a significant amount of water, it is clever to put it off.

Now going out for a week or more is another condition. Never forget to switch off your devices along with your water heater. They are not critical and delicate in use, but due to lower pressure or lesser water flow, they can cause an explosion.

So, the above answers ensure that there is no need to put it off after every use. Just turn off the tap of your hot water after every service, or you will have no cold water for mixing. When you purposely turn it off while going out for some work or vacation or fixing some pipeline problems, turn it off for safety and save your water.

What Are The Advantages of Tankless Water Heaters?

The tankless water heaters, also known as “on-demand water heaters,” have some perks of use. However, there is another side of the picture too. Talking about the good points, here are some of the advantages:


As the name suggests, the significant advantage is they fulfill their promise to supply you the hot water instantly and cause you no big spaces. The US Department of Energy indicates the owners of the heaters who consume more than 40 hot water gallons can vividly see a significant difference and a better experience with these tankless heaters.

Monthly expense

These innovative heaters are efficient in every aspect. They do not only provide you with excellent service but also save you up a fortune. You can save a handsome amount, measuring on an annual basis.


Water heaters with the tanks used to have the flaw of repairing it again and again. Their expected life was not much promising. This new tankless innovation brings you more extended usage, along with ease. These heaters can last up to 20-30 years or are even more dependent on their use.

Not spacious

The significant and dominating factor in upgrading is the leverage of space. Water heaters with tanks used to occupy too much of the room and had considerable weight. It is a reward kind of device for the ones living in small houses or apartments where they cannot afford to keep spaces for heaters. They usually are lighter, and usually, people mount them on the bathroom, kitchen, or basement walls.

As much hot water as you want

In water heaters with a tank, there was a limit to water consumption. They warm only a specific amount. Because of that, you are required to wait for the water to refill in the tank again. You cannot afford that in between your showers. Tankless water heaters save you from that inconveniencies.

No more standby

The previous traditional heaters were using the basic boiling technique in which they use to heat the water present in the tank. It was of no relevance to how long the water was in it. If you do not consume the water regularly, it keeps on boiling and boiling. The boiling indeed requires energy, and there was a significant amount of loss of power for no good reason. Secondly, if you burn too much, it can cause you a short circuit or an explosion. These new heaters do not have any standby technique. It works instantly on the water coming down for use.

Gas or Electric? – Whatever you want

It has two different modes based on your choice. You can find out which energy source is cheaper for you, and you get the one with that mode.

Overall, if your house is catering to a single-family with 6-8 persons, tankless water heaters are the best option. They also include more extended warranty periods in case you are having issues with your new unit. And they promise the continuation of instant hot water along with energy and cost-effective methods.

They are usually designed to manage to provide hot water for the continuous use of a family. If you have lesser use of the hot water, exchange it with the previous technology available with the tank and try to turn it off for energy consumption.

What Are The Downsides of Tankless Water Heaters?

There are also some drawbacks or cons to the tankless water heaters, which are as follows:

Buying price

Although it is an excellent service provider of hot water and more efficient than the other ones, it comes with a large investment for the first time. Tank water heaters were usually ranging below $500, but the initial basic models of tankless water heaters start from $1000, almost more than double.

Another issue is that recent technologies have lesser influence that grows over time. So, for now, we have lesser laborers for its installation and repair. Being the specific ones, they take the chance of monopoly and charge higher costs. It ends up tagging this product as the expensive ones beyond our range.

Water supply to a single tap

No doubt, it provides you with as much hot water as you want. When it comes to the consumption of hot water at more than a place, it lacks efficiency and can supply water to a single person. To get supply simultaneously, get another unit and splurge some more.

Maintenance cost

You may have heard people saying that maintaining something requires more effort and worth than buying. It is not just a significant investment just for a start.

The primary issue is the owners are obliged to flush their unit to get rid of the minerals stored in it. Before planning to get the tankless heater, there are many other expenses, have some backup money for its maintenance too.


They have created hype in the market with their innovative features, but people are looking for some other alternatives due to high buying, installation, and maintenance costs. At this point, the tankless water heaters get beaten. The new solar heaters, along with large tanks, can save up a significant amount of water, and the method includes an infinite amount of free energy.

How does a tankless water heater work? 

It works on the principle of exchanging heat. When you open the tap, the heater warms the water when it passes through its coils and ends up giving you the desired temperature of the water. You can read about the working of tankless water heater in detail as well.

How will it increase my savings?  

Many of us want a cheaper alternative than better quality. The unit is long-lasting and will give you years of excellent service. Although the investment in the start and maintenance is also not very easy, it saves you up a significant amount on an annual basis. The energy loss also gets eliminated.

What is the difference between natural gas and propane?  

The question is carrying the answer too. Natural gas and propane are two different modes depending on the fuel. Natural gas is cheaper and available easily compared to propane.

Is my house eligible to have a tankless water heater?

That’s right. The tankless water heaters are not that easy to buy and fit. It requires confined ventilation for the gas and other electric requirements. Not everyone is available to install it.

Call a technician who is verified through the license. Hard water users get a lot of minerals in the water. Heating it causes the saving of minerals for which you then need a water softener.


We have defined the pros and cons quite briefly. It will make it easy for you to make up your mind whether the tankless water heaters are the best product for your family or not. It would be best if you put it all in the scale-weighing machine.

Is the annual cost savings, instant hot water supply, and extra space will outweigh your buying, installation, and maintenance costs or not? You also have the idea of the frequently asked question: “Should I Turn Off Tankless Water Heater If Water Is Off?”

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With years of experience under his belt, Adam decided to put his water heater knowledge to work. By providing high-quality content and expert guides, Adam hopes to help anyone looking for expert water heater advice.