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Old 01-09-2012, 04:07 PM   #1
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Hot water heater


What would cause a hot water heater to drain out an outside airvent?

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Old 01-09-2012, 04:25 PM   #2
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What would cause a hot water heater to drain out an outside airvent?
As there is no such thing as an "outside airvent" associated with water heater... we're left to assume that you have something else going on.

My crystal ball says that the relief valve pipe exits outside...
and for one reason or another it blew off.

Look for where/how that pipe connects with the water heater...
tell us what you find.

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Old 01-10-2012, 12:14 PM   #3
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Thank you! We think your crystal ball is right on. My husband is replacing the pressure relief value. We are still concerned about what caused it to blow. It is our secondary heater that we keep it turned down to pilot light until I wash clothes. I had turned it up to high as I was going to do laundry prior to the hot water coming out the pressure value drain. Could it be a faulty thermostat?
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Old 01-10-2012, 01:41 PM   #4
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It is our secondary heater that we keep it turned down to pilot light until I wash clothes. I had turned it up to high as I was going to do laundry prior to the hot water coming out the pressure value drain.
Could it be a faulty thermostat?
Could be... frequent up and down adjustments isn't advisable.
How often do you do hot water (whites?) washes?

Water heaters are like mothers in law: the less you mess with them the better.
Find a reasonable compromise that suits most of your needs and then leave them (both) be.

Last edited by TarheelTerp; 01-10-2012 at 01:43 PM.
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Old 01-10-2012, 01:46 PM   #5
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might just want to go to PILOT position on the dial and not touch the temperature dial then when you need the wash hot water just put the valve knob to ON from pilot and the burner should start..those dials are just bi-metal and aren't designed to be turned up and down....the relief was doing its job in blowing off the HWH tank
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Old 01-10-2012, 02:38 PM   #6
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Water expands when heated. If your system does not have an expansion tank and does have a check valve to prevent backing up into the water main, then each time a new tankful is heated, the pressure/temperature relief valve may trip.
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Old 01-10-2012, 05:12 PM   #7
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Thank you so much for sharing your knowledge and humor. We will implement your suggestions. I never cease to be amazed at what you can learn on the computer. Great helpful site.

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