I couldn't find a code reference in a quick internet search, but I was
told by an inspector that it was against code to have a hot water
shutoff valve on a water heater (assuming a tank type), only a cold
water shutoff valve that feeds the water heater. Having a hot water
shutoff that accidentally got closed may lead to over pressurization of
the tank and an unexpected boom should the T&P valve fail.
Others on the list may want to consult with their local building
inspector if considering adding a valve on the hot water side of their tank.
Mullen, Tim (IS) wrote:
> I cut the hard copper lines and installed threaded fittings on the
> "stubs". I then added a ball valve to each line, and a "flexible"
> copper line to the tank itself. It made the installation easy (didn't
> have to try to line up the pipes exactly), and will be even easier next
> time (with the ball valves, I don't even have to turn off the water to
> the house, just close the valves and isolate tank for the rest of the
> plumbing). The gas line was changed to a flexible one too...
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