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Yes, make sure you turn off power to the water heater. Also shut off the icemaker. No. Just turn it off. Just remember to turn it back on before you open any of your inside faucets. And you also need to turn off the hot water heater.
YES and No Yes if you are going to be working on the gas water heater and No if you are working on a cold water line and if you are working on a hot water line you can shut off the gas or electric to the water heater so in case your water heater drains but what I usually do is just turn the water heater's water supply valve off.
Same as any hot water heater. Turn the gas valve to off.
It's not a bad idea to turn off the water heater especially if it is electric. It will consume power the whole time you are gone to keep the water hot and wastes a lot of electricity.
Not if the water heater is electric
No, and this is a very good energy saving practice.
Turn off to replace or service. Turn off if away from home for extended amount of time, such as vacation.
turn off your water
It would be bad if you had on and off for a long period of time?
no you dont It is safe to leave the water on, whislt changing the stem If you don't want any problems, turn the pressure off.
Turn it off at the fuise box, whyheat water when your not there
No. Turn off either electric or gas to water heater so it won't continue to heat water unnecessarily. Turn back on when water outage is over.