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Say Dave Yates...Paul P

Paul Pollets
Paul Pollets Member Posts: 3,661
Say Dave, I spoke with **** Anderson, Seattle's chief plumbing inspector, this AM to clarify water heater usage in this city. He said the use of open systems is permitted providing the hot water heater has a thermostic mixing valve on the potable side, if the unit is to be fired over 120; and a timer on the "non-potable" side to circulate the water at least 1x per day. Since the heating pump is powered by a thermostat, how will the pump timer overide the thermostat relay??
He also mentioned the Seattle Boiler Dept. handed over this "sticky wicket", to the Plbg Dept, rather than define the code furtheror get embroiled in controversy. Heat exchangers are not required to separate potable from non-potable, even though the UMC seems to infer that they do. I suspect someone will have to get sick before this issue is resolved. We don't promote or install combined systems without use of coils(CombiCor) or HX's. Don't want the long term liability.

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