1- the valve does not hold properly2- By pass allowing cold to enter the hot water line3- Someone failed to close the return circulation line
Check the shut-off valve above it. It may be turned off or plugged up.
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.
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.
If you have your own water heater there should be a shut off at the heater. If not I would look under the kitchen sink. There may be shut off valves at each fixture. If there is a central water heater in the basement, there would be a shut off to each unit.
Shut the tank down, so that it does not fire up. Was you water shut off,due to unpaid bill. Is there a break in the water line feed to the house. Did the check valve break, did someone shut off a valve to the heater. For what ever reason, if there is no water flow to the heater, it must be turned off.
Water heaters should be turned off, with the gas or electric to them turned off as well, when replacing any hot water lines. This would also be a good time to drain the tank and remove any built up water scale. This makes your heater more efficient.
On any water heater, the shut off is on the incoming cold pipe.
One shut off the gas /electric other emergency switch FIRST
Odds are that the cold water lines to the faucet you are trying to use are shut off but the hot water lines coming from the water heater are not. That is why you have hot water but no cold water.
Yes, your gas water heater will still distribute hot water.
As long as the water doesn't drain out of the heater somehow, no. What kind of car are we working on...
It sounds like air is in the water heater. It happens when your city water is shut down for repair sometimes and you get air in your pipes when the water flow is continued. You didn't open the valve enough or you may not have an air trap pipe.