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Need help on Nat gas water heater

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Need help on Nat gas water heater

Old 10-14-2016, 09:06 PM
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Default Need help on Nat gas water heater

We have our nat gas water heater outside in one of those huts and this is the 3rd water heater . This one is about 5 yrs old best I can recall

Just had a new controller put a few weeks ago and all works fine

Got up Thursday am and no hot water, went outside and saw water running out on the ground . I opened the hut up and the pipe coming out of the top, I think it is a pressure relief valve from what I understand, had water coming out and and put out the pilot light. I cut the water supply off and then hooked a hose to the drain valve and drained all water out of the tank. While it was draining I re lit the pilot light, turned water back on and it fired right up. 30 minutes later I had hot water

I went by my house twice during the day to check on it and all seems fine.

Called plumber and he was to come out Saturday but even today everything seems fine. I called him and he said just keep an eye on it and let him know. He did say the pressure relief valves go bad and felt probably all it is.

Would there have been something to cause this to happen that is a one time deal
Old 10-14-2016, 09:42 PM
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Pressure relief valves are known to fail, or at least stick partially open due to scale, etc. Open and close it a couple times to clear out any sediment and should be good to go. Easy to swap out if you're handy.
Old 10-14-2016, 09:44 PM
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You have a ICBM in your back yard?
Old 10-14-2016, 09:52 PM
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Could be trash from initial install in tprv, a bad tprv or thermostat set too high or faulty
Old 10-15-2016, 10:03 AM
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Ditto, once the pressure release valve trips the best option is replace with a new one.
Old 10-15-2016, 10:04 AM
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Thanks for the help
Old 10-15-2016, 10:05 AM
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Originally Posted by bikerboy View Post
You have a ICBM in your back yard?


Not sure I understand ;?;?
Old 10-15-2016, 10:45 AM
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Originally Posted by tprice View Post
Not sure I understand ;?;?
http://www.theplumbinginfo.com/water...-lurking-home/

A 50 gal gas heater around here sells for $325. Just have the plumber replace it. By the time he gets done dicking around with it you will have spent 1/2 or more what it cost to just replace it.
Old 10-15-2016, 10:55 AM
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The pressure relief should be run to the outside of the shed, this would prevent it from putting out the pilot if it happens again. I would replace the relief valve, but if the heater does not have a expansion tank, this could happen. Many areas are installing back flow preventers on the incoming water line, and the water has nowhere to expand to when it heats up, and the relief valve opens. If this is the case,you may need to install a expansion tank.
Old 10-15-2016, 07:11 PM
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Originally Posted by N D H View Post
The pressure relief should be run to the outside of the shed, this would prevent it from putting out the pilot if it happens again. I would replace the relief valve, but if the heater does not have a expansion tank, this could happen. Many areas are installing back flow preventers on the incoming water line, and the water has nowhere to expand to when it heats up, and the relief valve opens. If this is the case,you may need to install a expansion tank.
Doesn't need to be plumbed outside. If done properly the pressure relief should have a pipe attached to it that doesn't terminate more than 6 inches above the floor.
If done this way it shouldn't put out the pilot light.
Old 10-15-2016, 07:14 PM
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If you have natural gas install an on-demand hot water heater.
Old 10-16-2016, 07:17 AM
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Originally Posted by mikefloyd View Post
Ditto, once the pressure release valve trips the best option is replace with a new one.
yes
Old 10-16-2016, 08:26 AM
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My nat. gas water heater just turned 27 years old. works flawlessly daily with no repairs,no flushing etc. I remember 10yrs ago wondering if it'll fail any day now .
Old 10-16-2016, 09:52 AM
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I've seen them fail by dripping , but not by blowing off and flooding . Did or does the water get abnormally hot ? A brand new controller was just installed ? I'm guessing it stuck or was turned up too high , new ones can be defective .. In some installations , you may need to add a expansion tank . Replacing the T&P valve is good protocol , but its outside , I might guide it to a safe area and tap it to seat it if it drips and pay attention to high temp fluctuations first . Replace later once the problem is figured out
Old 10-16-2016, 06:27 PM
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Agree temp of water got too hot.

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