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.
There's no harm to turning off your hot water heater if you want. You'll just have to light it again when you get home. People are probably advising you to leave it on pilot so you can just turn it back up when you get home.
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.
Else, if you have a full water tank, and you need to turn off the water for an issue unrelated to your water heater, then it really doesn't matter if you turn the water heater on or off.
You may also choose to turn your hot water heater off completely. For gas water heaters, shut off the gas supply to the tank. For electric water heaters, turn off the power to the machine in your breaker box. When you return, simply restore the connections and relight the pilot light if you have a gas water heater.
Use Vacation Mode
Many modern hot water heaters come equipped with a “vacation mode” feature. This setting typically maintains the water temperature at around 50°F, reducing energy use while protecting your home from freezing temperatures and bacterial growth.
To prevent damage to your home, it is advisable to turn off the main shut-off valve before going on a vacation. You can find the main valve in the basement, crawlspaces, concrete slab, or the attic. You might also find the main shut-off valve in a utility box near your front sidewalk.
Cons of turning off your heater:
It results in no hot water in your water supply when you need it. You may also encounter difficulties turning the power back on, delaying the use of warm water.
Vacation mode is a setting on your water heater system that allows you to run your boiler at lower temperatures than normal, saving energy. Typically, manufacturers set vacation mode to 50° F—well below the warmth you need to heat your home, but hot enough to prevent any water from freezing while you're away.
Pipes: Turn off water supply to the house and drain pipes to protect them from freezing. You can empty pipes by running the water and flushing the toilets after the water has been turned off. After draining the pipes, it is a good idea to leave the faucets open to prevent pressure build up from any water that remains.
Turning off your water heater, like many other electrical appliances, can save you money each month on your bill. A small amount of heat escapes when the water heater is turned on, even though it's well insulated. Typically, this loss of energy is about 10 percent of your bill.
Industry Standards. Industry guidelines are clear about water stagnation. They suggest that water should not sit unused in a heater for long periods. The exact timeframe varies, but generally, it is recommended to replace the water if it has been stagnant for more than six months.
While turning off your furnace can save you money on your utility bills, it can also cause more harm than good. To prevent coming home to a disaster, keep your furnace on.
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.
If boilers didn't come with a host of sensors and controls, it might indeed damage your boiler if you turned it on with no water to heat up. Your combi boiler would be the worst affected, as the heat exchanger could suffer, but your cylinder and radiators would probably be fine.
Timers are most cost effective if you don't want to install a heat trap and insulate your water heater tank and pipes. Timers aren't as cost effective or useful on gas water heaters because of their pilot lights.
Shutting Off Your Water Heater Can Cause Problems
If you have an older unit, you may have some difficulty turning it back on after being shut off for several days. The stress of rebooting the system of an older unit could lead to water heater repairs or a full replacement.
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.
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.
The short answer is yes, as long as you don't mind using cold water. Shutting off the input to your water heater will not affect your home's main water supply. You can still run appliances like your washing machine or dishwasher, flush your toilet, and use your shower, sink, or garden hose.
Vacation mode is a setting on your water heater that allows you to run at lower temperature than normal, saving energy and money. Typically, manufacturers set vacation mode to around 50°F, well below the temperature you need to for a shower, but warm enough to prevent freezing while you're away.
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.
Just like your boiler, if you're going on holiday during the summer, it's worth turning off your hot water. There's no point paying for it when you're not at home. But if you're going away in winter, leave your hot water on. Otherwise there's a risk you could come home to frozen or burst pipes.
Shut Off the Water
This step isn't necessary for a short getaway, but if you will be gone a week or more it is a good practice to get into. It's best to turn off the water main but if you have appliances like an ice maker that need water regularly you can still turn off the water to your bathroom toilets and sinks.