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Old 12-14-2009, 09:52 PM   #1
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i have a water heater that is constantly running hot water out of the blow-off valve... does anyone have any suggestions?

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Old 12-14-2009, 09:57 PM   #2
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What kind of water heater? (electric?, gas?, oil?, tankless?, indirect?)

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Old 12-14-2009, 10:19 PM   #3
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its like a 40g electric
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Old 12-15-2009, 07:57 AM   #4
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Ayuh,... Either the valve is Bad, or the heater is over pressurizing... Probably the Valve...
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Old 12-15-2009, 08:46 AM   #5
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Either way its a potentially dangerous situation. Turn the heater off and Get yourself a licensed plumber to check it out immediately. TPR valves are there to protect you from a potential over pressurized heater and the resulting explosion.
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Old 12-15-2009, 08:48 AM   #6
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(copied from another post)

If you have a backflow preventer in the water line going out to the main or pump/well, then you need an expansion tank in the hot water line just exiting the heater.

Or if you already have an expansion tank, that may need to be recalibrated. Usually turning off the water for a moment and emptying the tank of water will achieve an acceptable temporary re-calibration.

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Last edited by AllanJ; 12-15-2009 at 08:51 AM.
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