Is inlet valve required for "cold in" on water heater?
If the water heater springs a leak you would have to shut off the cold water as well (via the house main shutoff).
Not sure if code requires the shutoff at the water heater inlet, code probably does.
Nothing would prevent you from hooking up the line without the shutoff temporarily until you could get to Home Depot to buy a new one.
Ran into a situation (in an apartment) where two water heaters were connected in parallel for added hot water capacity. One sprung a leak and the cold shutoff was turned off pending heater replacement. They did not realize (and/or could do nothing about it) that leaking onto the floor was not stopped because full pressure coming back around from the hot side was still on the tank.
What they needed was shutoffs on both hot and cold of each heater. This can be dangerous because both hot and cold may not be shut off at the same time when the heater itself is still turned on as expansion of the water when heated could burst the tank.
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Last edited by AllanJ; 11-26-2010 at 08:28 AM.