Originally Posted by RWG75
Originally Posted by Fat_Mike

Shut off valve on the hot water TO the house? Doesn't make sense. All you need is a shut off of the cold to the tank. Once that's shut off there's no hot water pressure to the house.


Comes in handy when swapping the tank - keeps the lines from draining back when you disco the tank. My copper stubs have shuts offs with NPT adapters then braided stainless NPT to NPT hoses to the tank. Kinda like this but with a water heater:


When you drain the water heater prior to replacing it, whatever water is in the lines drains back also. I'm not saying a valve on the hot side is a a bad idea, just very unnecessary.