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Question DetailsAsked on 7/10/2017

when changing a water pressure reduction valve, do you have to turn off the supply to the hot water tank first?

don't want to ruin the hot water tank

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The water has to be shut down to the regulator location and to all pipes "downstream" of where the pressure reducing valve is going - so main water shutoff if a whole-house pressure regulator, or sometimes separate shutoff valve just to the appliance being worked on for boilers and water heaters and such - though not all have dedicated cold water shutoffs (though they should for use in case they develop a leak so the entire house does not have to be shut off in that case)..


And if shutting off water (and draining water out of pipes to do the pressure regulator installation), tankless type heaters should have the power/gas turned off to them completely because they can drain/siphon dry and be damaged that way if the power is left on. Regular tank type water heaters are fed from the top, so generally will not siphon the water out when you drain the pipes (though I have seen it in ones with filler dip tubes reaching the bottom of the tank) - but because you are draining at least part of the piping my practice is to turn all tank type water heaters and boilers down to at least pilot only if not compoletely off (or to OFF if no standing pilot) - that way you greatly reduce or eliminate the risk of overheating in case the job takes longer than expected and the water is off for a day or so (say a pipe breaks in the process or such) rather than the expected hour or so. of course, they then need to be turned back on once the watewr is back on AND water has been run through the hot pipes to flush out the air - that is CRITICAL for tankless heaters, because jusat turning the water back on does not necessarily fill them - without a hot faucet open downstream open the water may jusat pressurize the air in the pipes and not fill the heater.

Answered 1 year ago by LCD




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