It May Be A Good Idea To Turn It Off As Long As It Remains Near Full It Would Be OK. Just Incase Turn It Off. That Way The Top Element Will Not Be In Open Air( Not Covered With Water ). Which Will Cause It To Burn Out. Also When Water Is Turned Back On. Turn On The Hotwater & Let It Run To Remove Any Air That Might Be Trapped In Tank. Then Turn It Back On.
Not normally - without the water flowing from the meter, water cannot be consumed within the home, so the level inside the water heater will remain as it was before the water meter was turned off. It is common sense to remove power or shut off the gas to the water heater when another utility is shut down.
it could be from the hot water heater if it's not turned off. hot water expands pushing out more water when cool the heater can suck in air to fill the voide.
There should be two valves on or near the top of your water heater. One is for the inlet (cold water) into the heater the other is for the outlet (hot water) out of the heater to your house. They must both be open ( turned to the left or counter clockwise).
There should be a shutoff at the wall where the water line enters the house. There may be one before the water heater or there will be one at the water meter.
Should be a shut off valve in the basement closest to the street or if on a slab, by the water heater. If neither, there is one at the water meter.
Yes, shut off water to entire residence if residence totally dependent on electric, including heat. If residence heated by hot water or steam heating system, water needs to be ON to boiler for heating system. Anything else that has water going to it can be turned off if it has a separate valve for it. Electric water heater should have power turned off and gas water heater should have gas turned off. Outside hydrant hoses should be disconnected.
Not unless the water line is cut on the cities side of the meter. Even that is doubtful because the meter should be one way and not allow house water to get back to the main line.
Standard meter will suffice, need to know pressure from meter to house. Size pipe appropriately for gas pressure coming into house X distance to water heater. Gas company or plumber should be able to help with this calculation.
It is probably right next to the water heater. There should be a shutoff at the floor, if not then at the meter is the most likely shutoff.
Turn off electric to water heater, depending on style, gas water heater may need electric turned off to it also. Turn off gas for gas water heater. If unfamiliar with removing and installing water heater, call a plumber.
Depending on what type of water heater you have there should be a plug or valve at the base of the water heater