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What can I do to stop my gas hot water heater from spitting water out the pressure release valve?

At unknown intervals my hot water heater spits a small amount of water out the pressure release valve, I have changed the valve, and lowered the temp to 110F with no results. Any help would be appreciated.

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Denis Kinsner

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Check the "pressure reducing valve's" setting, and look for any creeping up on the gauge, which means the "PRV" is bad, causing an overpressure condition which, along with the heated water's expansion, will cause the water heater's relief valve to partially open.
The gauge can be bought from a plumbing supply house, or online, and should read from zero, to 100 lbs. 65 to 80 pounds is normal for a residential home. The gauge should have a female hose thread attachment adapter, along with a hose washer. turn on the faucet for about 5 seconds. That will relieve the excess pressure (if any) then shut off, attach the gauge, then turn on the faucet. If the gauge reads over 80lbs., or the pressure creeps up beyond 80lbs, you have a bad "PRV". sometimes, if they are accessible, they can be flushed clean, and their silt screens removed and cleaned. debris under the seated washers can cause the creep, but left too long, can cause "wiredraw" of the seat, and the prv is junk.

Posted on Nov 28, 2014

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Mark

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You have sediment built up in the bottom of the tank, so flush the tank out.

Posted on Jul 23, 2014

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5 Related Answers

Anonymous

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SOURCE: I have a tankles hot water heater. The problem is

If this ia a Chronomite Tankless Electric water heater we suggest you call our technical service department at 800/447-4962 for assistance.

Posted on Dec 02, 2009

motor1258

Mike Butler

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SOURCE: no water pressure on hot water, when i by pas

How many valves on by-pass, or what style by-pass have you got on there? Remember water has to go in bottom (cold) and then out top (hot) . No valve in between should be open. Valves going direct in to cold, and out hot need to be open.

Posted on Apr 25, 2010

Anonymous

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SOURCE: burner lights but will not shut off. then pressure

i am having the same problem with mine changed the pressure relief valve and the ECO \ TSTAT but still gets extremely hot can't even touch the water what else could it be

Posted on May 02, 2010

motor1258

Mike Butler

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SOURCE: safety valve spits out water

It is normal for it to drip slightly when water heated, but if it is excessive, have to replace it. Seat gets dried out , and /or dirty. If for some reason water is getting so hot, that it's opening from that reason, then need to check thermostat on tank.

Posted on May 04, 2010

motor1258

Mike Butler

  • 6674 Answers

SOURCE: 2010 view winn- the hot water faucets, when wide

Double check that washers inside fittings attached to back of tank, are not wedged or pinched in there restricting flow. Drain tank, relieve water pressure prior, obviously. The other thing is to check that the by-pass is allowing good flow in to tank when in normal operation mode. Have seen those only go half way inside valve, but lever is at wide open setting. If all that checks out, try removing the check valve on tank, and replace it with a 1/2" galvanized pipe nipple, ( or certified plastic/nylon fitting same size) and reconnect water line direct to that, without a check valve. That should do it if nothing else was wrong. Now you have a choice, either change it or leave it out if everything seems ok, but double check that hot water isn't siphoning back to another utility such as toilet if you leave it out and toilet is close. Feeling that cold line (inlet) when water is hot should tell you. I've seen the check valve in both locations, hot (at top of tank) and cold (at bottom of tank -inlet) Not 100% sure why, right from factory that way, but I say, put it on bottom fitting if required at all. Let me know how you make out.

Posted on Oct 21, 2010

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