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Question DetailsAsked on 9/23/2014

Water heaters that pop Should they be flushed

watervheaters are popping and are making funny noise

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1 Answer


Yup - bottom sediment is aq good probability, especially if they have not been flushed in quite awhile. And I would be sure they still yield hot water (fromthe faucet) and are not boiling due to lack of incoming fresh water from a failed regulator or backflow preventer or water supply failure or such. Also, check the water temp coming out (right at start of demand cycle) to be sure the thermostat has not gone bad and is causing them t heat to boiling temp.

You said "water heaters are popping" - if you mean two or more at the same time, I would strongly suspect incoming water failure and they are near going dry - of course, in that case you would get no hot water out of the faucet (and probably no cold water either), though I have seen this issue on only the hot water side because a plumber improperly put in an expansion tank with an inflow control valve attached (like is used on a boiler) which stuck in the closed position, so there was no cold water supply to the hot water heater and it eventually "boiled dry" but at low enough temperature it never set off the temperature/pressure relief valve.

Answered 5 years ago by LCD

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