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Old 02-28-2012, 09:39 AM   #1
coz
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hot water heater relief valve


I understand what the valve is for and how to replace it but what is the root problem? What causes the pressure or temp to be too high?

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Old 02-28-2012, 10:42 AM   #2
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hot water heater relief valve


Some times they just go bad---but usually it is one of these:

Heater is full of lime--covering and insulating the temperature control rod on the back side of the gas valve.

To much water pressure---no expansion tank in system---

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Old 02-28-2012, 10:53 AM   #3
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hot water heater relief valve


Also failed thermostat causing an over heated condition can do it.
The water out of the taps should be 120 deg. any higher and there's a danger of burns. A simple check with a thermometer will tell you.
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Old 02-28-2012, 11:38 AM   #4
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hot water heater relief valve


Quote:
Originally Posted by coz View Post
I understand what the valve is for and how to replace it but what is the root problem? What causes the pressure or temp to be too high?
how old is this water heater.
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