I'd like to implement a backup water heater without creating a
"hydrostatic pipe bomb" or violating any meaningful plumbing code
My thought is to connect both water heaters to the cold water supply
with a single ball valve in line with each inlet connection. The
outlets would be connected through 3-way valves configured so that each
water heater is either connected to the house hot water line or open to
I've though of using ball valves on the inlet and outlet ports and
installing redundant pressure relief valves so that if the TPE valve
failed there'd be backup but think the 3-way valves are safer.
One of these water heaters is a 450,000 btu/hr oil fired unit and the
backup unit will be a 9 kw electric unit.
I'm in an area with no plumbing permitting or code enforcement but that
doesn't mean I have a death wish. Getting a replacement unit in can
take several weeks when the weather is bad so I'd like to be able to
just switch over in the event of a failure.
Comments on code violations?