What is the purpose of a timer on a water heater?

Author: Prof. Norval Streich  |  Last update: Friday, June 13, 2025

Water heater timers essentially allow homeowners to determine when their water heaters will function, depending on the times of the day when the occupants require hot water. These devices work best for households with relatively stable schedules and when the house is unoccupied for long periods.

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.

Why is there a timer on my hot water heater?

The primary purpose of the timer as you said is to save energy and increase lifespan of all components related to the pump and hot water system. There is no possible way to gaurantee (almost) instant hot water is going to be available everytime you need it when the pump is off.

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

It depends on how much hot water you are using and when. It can be more economic to keep it on constant. It takes longer to heat a full tank of cold water than it does to heat the water as it's used. If it's on constant then it'll not fire up unless it needs to. 'Constant' is a bit of a misleading term.

How much money does a water heater timer save?

If you have an electric water heater, you can save an additional 5%-12% of energy by installing a timer that turns it off at night when you don't use hot water and/or during your utility's peak demand times. You can install a timer yourself. They can cost $60 or more, but they can pay for themselves in about 1 year.

KIUC Explains the Benefits of a Water Heater Timer

Are water timers worth it?

Installing a water timer is one of the simplest ways to streamline your lawn care. A water timer will save you money, make your home more green, and give you back hours that you would have spent watering.

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.

Is it cheaper to leave the water heater on all the time?

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 ...

What is the most efficient setting for a hot water heater?

However, the Department of Energy notes that turning your water heater temperature down to 120 degrees Fahrenheit can help save energy.

Why do I only get 10 minutes of hot water?

If your hot water runs out too fast, you may have an issue with: Too much hot water demand from multiple sources at the same time. Sediment build up inside of your water heater tank. A broken dip tube.

Why does my water heater run for a few minutes then shut off?

If the heating coil is damaged or malfunctioning, it can cause the water heater to turn off. Another potential issue is a problem with the flow to the burner. The burner is what heats the water in a gas water heater, and if the flow of gas to the burner is disrupted, it can cause the water heater to turn off.

How many hours a day should hot water be on?

Only heat the hot water twice a day

Try heating the water for an hour in the morning and an hour in the evening. Start the water heating about an hour before you need it. For example, if you shower at 08:30, start heating the water at 07:30. If you wash up in the evening at 19:30, then start the water heating at 18:30.

Do I need a hot water timer?

Is a water heater timer right for you? If you've got a storage water heater, then you should look into getting a timer. It's that simple. The cost savings, energy efficiency, and positive environmental impact will help make your home, your wallet, and even the world more comfortable.

Why does my hot water heater have a timer?

Water heater timers essentially allow homeowners to determine when their water heaters will function, depending on the times of the day when the occupants require hot water. These devices work best for households with relatively stable schedules and when the house is unoccupied for long periods.

How often should a hot water heater run?

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.

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*.

Is 140 degrees to hot for a water heater?

The best temperature setting for a hot water heater is between 120 and 140 degrees. Below 120 degrees, bacteria can develop in the stagnant water sitting in the tank. Above 140 degrees, the water is so hot that you and your family members can be at risk for scalding in as little as two seconds.

How often should I flush my water heater?

Most homeowners should flush their water heaters every 6 months or so, but if you have extremely hard water, you may want to do it more often. Flushing your hot water heater could be necessary as often as every few months depending on the mineral content of your local water supply.

What temperature should hot water be for shower?

According to most dermatologists, the ideal shower temperature is anywhere between 98°F (37°C) and 104°F (40°C)—and no more than 105 °F (41°C). Rinsing under lukewarm water allows you to stay comfortable and maintain your body temperature while reaping all the benefits of both hot and cold showers.

What is the best temperature for a water heater to save money?

Although some manufacturers set water heater thermostats at 140ºF, most households usually only require them to be set at 120ºF, which also slows mineral buildup and corrosion in your water heater and pipes.

Does a water heater use a lot of electricity?

More kilowatts mean more electricity, and bigger water heaters will typically use more watts. The average water heater runs at around 1125 watts, though some more powerful water heaters can use up to 4000 watts.

What is the best hot water schedule?

Try an hour in the morning and an hour in the evening; if you don't run out of hot water, then that's enough – no need to spend more money than you have to!

Can a hot water heater last 20 years?

Water Heater Lifespan

With proper maintenance, a tank water heater tank should last six to 12 years. A tankless water heater can last for more than 20 years. Check your water heater's warranty for the most accurate timelines.

Why do water heaters fail so quickly?

Heating elements can gradual breakdown if there is a mineral build up in the heating system. This is because mineral deposits can solidify, encasing the elements and forcing it to work harder to heat the water. This will lead to gradual wear out that will make the heating system have a shorter life span.

Do hot water tanks need to be serviced?

The short answer is yes: your hot water cylinder and your boiler should be serviced every 12 months.

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