Does it damage a hot water heater to turn it on and off?

Author: Loy Rempel  |  Last update: Thursday, December 14, 2023

It's generally best to avoid turning your water heater off too regularly. Some homeowners try to save money by switching off their water heaters when they don't need them, but the savings are unlikely to be significant enough to justify the additional wear and tear on your machine.

Is it bad to Turn water heater on and off?

Many homeowners ask us if they should turn off their water heater between uses to save money. Our professional answer after crunching the numbers? No, unless you're going on vacation for a month or longer, you shouldn't turn off your water heater.

How long can a hot water heater be turned off?

WAPT spoke to four plumbing companies that all said that homeowners should turn off the water heater if the water is not running for more than 24 hours. Residents can go to the breaker box in the home and throw the breaker to the “off” position for the water heater.

Is it bad to turn water main on and off?

Nothing bad should happen and it's not an irrational thing to do. Turn the main valve slowly (both when turning off and on) to avoid possible water hammer effect that could stress pipe connections. For the same reason, turn taps in the house on slowly when bleeding air after you turn the main supply back on.

Is it bad to Turn your hot water heater all the way up?

Turning up the temperature on your hot water heater may have its benefits, but it can also cause safety risks. Water above 130 degrees Fahrenheit can scald you, and water above 140 degrees Fahrenheit can cause third-degree burns. Young children and the elderly are especially susceptible.

Common Water Heater Myths Answered | Ask This Old House

Can you overuse a hot water heater?

Once, your hot water heater was enough for your hot water needs. But if you've added another bathroom or more appliances that use hot water like a dishwasher, or if you have more people living in your home, it may be working too hard to provide you with hot water. That overuse can accelerate your water heater failing.

Should you keep your water heater on low hot or very hot?

120 degrees Fahrenheit is the safety recommendation against scalding, but 140° is the common default setting. Most experts agree that anything below 120 degrees creates a risk for bacteria to develop inside your water heater from stagnant water, such as legionella that causes Legionnaire's disease.

Can I shut off the water to my house and safely leave the water heater on while I'm away on vacation for a week?

As a water heater heats up, the water expands Unless you have an expansion tank, a small amount of water must be allowed to backup into the water mains. If the main water valve is turned off, there is no place for the water to expand into. So, do not turn off the water and leave the water heater on.

Is it OK to turn off water to toilet for a week?

How Long Can You Turn Off Water to a Toilet? Like turning off your toilet's water for a night, it's safe to do so for a week. While you can keep your toilet water off for as long as you'd like, we wouldn't recommend it unless you have a problem with your toilet's plumbing system.

Can turning off water cause pipes to burst?

Pipes can still burst in freezing temperatures even after you turn off your home's water. The pipes will still have water inside them, which means the water may freeze and potentially burst your pipes.

Is it OK to turn off hot 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 shortens the life of a water heater?

Hard water can cause sediment to build up in your water heater, leading to corrosion and shortened lifespan. We recommend installing a water softener or using a filtration system if you have hard water. This will not only extend the life of your water heater, but it will also improve the quality of your water overall.

Should a hot water heater run all the time?

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.

How often should a water heater cycle on and off?

Normally It will cycle every time you use a few gallons of hot water, if it is cycling dramatically more than that it is possible that you have a hot water leak somewhere.

How long should a water heater last you?

With regular inspection, draining, and flushing, you can expect a gas water heater to last anywhere from 8-12 years and an electric water heater to last anywhere from 10-15 years.

How often does a water heater turn on and off?

According to our energy service advisors, your water heater accounts for 14-20% of your electric bill. Try out these tips from PEC to save more throughout the year. A basic water heater will run three to five hours a day to keep its tank heated 24/7.

How often should you flush a toilet you don't use?

Unused toilets are a bit like unused cars, in that you need to run them periodically so they don't stop working altogether. For toilets, you need to flush them at least once a week. Additionally, you can't really overdo it, so if you're not sure, flush anyway.

How many times a week should you clean the toilet?

Daily: Flush your toilet every day (even if it's not in use) to discourage the growth of bacteria. Weekly: Deep-clean your toilet once a week or biweekly—this includes the toilet bowl, exterior and toilet seat.

Should you leave toilet lid up or down when you go on vacation?

Standing water encourages mosquitoes to breed … something you don't want happening at your house. Tip #2 – Leave the toilet seat up and open when away for an extended time.

What to turn off when leaving the house for a week?

Unplug Appliances and Electronics

Save money on your energy bill and avoid the risk of an electric fire while you're gone by unplugging any electronics not associated with home security, lighting or your refrigerator. There's no need to leave your printer or bedroom TV plugged in when no one's around to use it.

Do you have to turn off power to turn up water heater?

Step 1: Turn off the power — This is always the first step when adjusting the temperature on an electric water heater. It's the best way to avoid getting an electric shock! Find the circuit breakers that control the water heater, and flip them to the “Off” position.

How long can water sit in hot water tank?

As an estimate, the water in your tank should stay hot for a day or two. The larger the tank, the greater the heat loss will be, and it depends on the quality of your tank as well as the form of insulation you have.

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

Manufacturers typically choose a temp to set water heaters between 120-140°F. To prevent scalding and save on energy costs 120 degrees is the recommended temperature, but the Occupational Safety and Health Administration (OSHA) recommends setting it to at least 122 degrees to prevent the growth of harmful bacteria.

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

If you're looking for a short answer, it's 120 degrees Fahrenheit (about 49 degrees Celsius). Many water heaters are set to 140 degrees F per factory specifications, but lowering the temperature can lead to energy savings of 4% to 22%, and up to $400, according to the Department of Energy.

What is the average temperature that a hot water heater should be set at?

The standard temperature for most water heaters is 140 degrees F, but the Department of Energy recommends turning down the temperature to 120 degrees to save energy.

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