It is good to know that most Villages houses have a valve on the cold water line just before it enters the water heater. If your water heater is leaking, you can close this valve and it will shut off the hot water, but you will still have cold water in the house. So, it is not necessary to close the main water shutoff valve to the entire house.
Also, I have a battery operated water alarm located in the water heater drain overflow pan. Recently, this alarm alerted me to a pinhole leak in the expansion tank. So, I was able to get the expansion tank replaced with no water damage to the house.
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