Should water heater always be on or off?

Author: Dorthy Howe  |  Last update: Monday, February 2, 2026

No, unless you're going on vacation for a month or longer, you shouldn't turn off your water heater. Here's why: You won't see significant energy savings. You'll create more problems by turning your water heater off/on repeatedly.

Should I leave the water heater on or off?

Overall, it's actually best to keep your hot water heater on when you are away from your home for extended periods of time. While turning down HVAC systems and limiting electrical use could provide some savings during a vacation, turning off your water heater could cause more harm than good.

Is it better to keep the water heater on all the time?

There's no reason not to leave it on all day. It isn't burning gas all day. If it's an indirect hot water cylinder then as water is used it is automatically replaced by cold entering the bottom of the cylinder. The hot water you get from the tank never goes through the boiler.

Is a water heater supposed to run all the time?

In most instances, the answer to our last question is no. If your water heater is constantly running, there is probably a problem. Here are a few potential problems your home or business could be having and a few steps you could take before calling for professional plumbing services in Denver.

Is it OK to turn off water heater when not in use?

YES. It is a very good idea to turn off, or unplug, your hot water recirculating pumps if and when you turn off the water or the water heater for any extended period.

Radiators Coming On With Your Hot Water (Even With The Heating Off)? This Is The Cause

What happens when you turn off your water heater?

Shutting Off Your Water Heater Can Cause Problems

The most obvious issue is that you won't have any hot water. It could take up to an hour for any hot water to be available for those post-travel showers, and this is only if you're able to turn your water heater back on.

Is it worth turning off water heater at night?

Generally speaking, a gas water heater should not be turned off unless you are leaving the house for an extended period of time. Even then the better choice for gas water heaters is to just turn the temperature down. In fact, many water heaters have a “vacation” setting on the temperature control.

What happens if you leave the water heater on?

prolonged usage may cause the geyser's heating element to overheat, potentially damaging the appliance. This was the main reason why the appliance burst. Other things that can happen are: Continuous operation results in unnecessary energy consumption, contributing to higher utility bills.

Is it a good idea to put a timer on a water heater?

A water heater timer can save you money on both your electricity and water bills. However, homeowners with hot water tanks located outside of their homes, report seeing the most significant margin of savings. The reason being that the cold temperatures outside make your water heater work overtime to stay warm.

Should you hear your hot water heater running?

It's not uncommon for your water heater to make a certain amount of noise while it's running. This is especially true at this time of the year, since your water heater has to work harder in winter to provide you with the warm water your house needs.

Should you turn your hot water off?

Instead of turning it off completely, you should set your water heater to a lower temperature than usual while you're away from home. This will save energy and eliminate the risks of damage to your unit. It will also prevent the possibility of the unit being overloaded when you turn it back on again.

Should the heater always be on?

Ultimately then, the key to cost effective home heating isn't to leave the system on all day every day. It will save you money in the long run to properly insulate your home, ensuring you won't need to use as much energy to keep your home at a comfortable temperature.

What setting should I put my water heater on?

Water Heater Temperature Recommendations

120 degrees Fahrenheit is the safety recommendation against scalding, but 140° is the common default setting.

Should the water heater always be on?

It's better to leave the hot water heater on all the time, rather than turning it on and off. This is a very common energy saving myth. But in fact, you really don't need to be heating your water all the time. Your immersion heater or boiler will heat up hot water which is stored in a tank.

Does turning off a water heater save money?

Common sense tells you the water heater doesn't use electricity when it's shut off so clearly you can save money. The energy experts say it's about $1.36 a day. The question you have to answer is whether it's worth it because there are some inherent problems with turning a water heater on and off.

What happens if you leave the hot water on all night?

If you keep your water at a high temperature all the time, you will lose more heat to the environment even if the cylinder is well insulated. Your water heating costs will increase in direct proportion to the average temperature of the cylinder over the day. You will end up paying for more energy as a result.

Is it better to have hot water on timer or constant?

Although it takes longer and requires more fuel to heat cold water, the energy required to maintain this constant temperature is much more expensive than the few times it is heated when necessary on occasion, due to its non-use, this water is also wasted, as a result, running a boiler continuously consumes more fuel ...

Is it better to leave the water heater on all day?

- For a storage water heater, it is sufficient to switch it on for 10-30 minutes before showering. - Leaving a storage water heater switched on for the entire day may cost you an additional $124 a year*.

Does a water heater run constantly?

In the average home, the water heater will run for about three hours each day. Total run time can range from one to two hours for new tankless water heaters to five or more hours for older tank style water heaters.

When should you turn off the water heater?

However, there are two key instances when you should turn it off: The Tank Is Empty or Nearly Empty: If the water heater tank is empty and won't be refilled for an extended time, the heating elements (for electric water heaters) or the burner (for gas models) could overheat.

What shortens the life of a water heater?

Sediment can build up over time in a water heater, shortening its lifespan. To prevent this, you should flush your water heater at least once per year. Flushing will help to remove any sediment that has built up and improve the efficiency of your water heater.

Should I put my water heater on vacation mode?

That way, your water heater is saving energy while using sufficient energy to keep water flowing and preventing frozen plumbing. If you'll be away from your home for more than three days, it's recommended you use Vacation Mode.

Is it better to leave water heater on or turn on and off?

No, unless you're going on vacation for a month or longer, you shouldn't turn off your water heater. Here's why: You won't see significant energy savings. You'll create more problems by turning your water heater off/on repeatedly.

What is the best schedule for hot water?

Only heat the hot water twice a day

Try heating the water for an hour in the morning and an hour in the evening.

Does turning the water heater on and off cost more?

Turning your water heater off completely when it's not in use can help you save a small amount of money each month on your energy bills, but the hassle of manually turning your unit off and on typically outweighs the benefits.

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