Water heater pressure release valve

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  #1  
Old 06-20-01, 10:14 AM
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Join Date: Sep 2000
Location: Columbia, SC
Posts: 220
The pressure release valve on my water heater allows a constant flow of water through the overflow pipe. The rate of flow varies from slightly dripping to pouring out as if it was an open faucet. The overflow valve was replaced only a year ago. When the "tester" on the overflow valve is lifted the water flows freely in the manner of which the overflow valve was designed. there is no leaking sound or water flow indicated other than the water flowing outside trough the drain pipe. Do I need a new overflow valve? Do I need a new water heater? Any help would be appreciated.
 
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  #2  
Old 06-20-01, 07:22 PM
Join Date: Dec 1999
Location: Northeastern NC On The Albemarle Sound
Posts: 10,952
Cool

First, just replace that Temperature-and-Pressure (T&P)relief valve.
If that doesn't solve the problem, then you need to install an expansion tank on your water heater (IF you are on public water).
You don't need to replace a water heater unless the tank itself is leaking.
Good Luck!

 
  #3  
Old 06-20-01, 08:16 PM
plumbguy
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Its either excessive pressure (over 80 psi) the unit is overheating or you are getting thermal expansion.
 
  #4  
Old 06-20-01, 08:37 PM
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Location: Columbia, SC
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Okay, guys...what is an expansion tank? How do I reduce pressure, prevent overheating or thermal expansion?

It IS good to know that I don't need a new water heater.

Thanks for your replies.
 
  #5  
Old 06-21-01, 06:47 AM
Join Date: Dec 1999
Location: Northeastern NC On The Albemarle Sound
Posts: 10,952
Cool


These are expansion tanks that go on a water heater.
If you are on public water supply, you may have a Pressure Reducing Valve to reduce the water pressure, which makes it a closed system and the heated water cannot expand back into the line (thermal expansion).
Therefore, you would need an expansion tank.
If it is an overheating problem, you probably need to replace your upper thermostat (I always replace both, if I need to replace one of them.)
I'm not a pro plumber (plumbguy is), but I hope that this helps you.
Good Luck!

 
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