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HVAC, Air Conditioners, Aqua Hot, Primus, Webasto, Chassis Heaters, Furnaces and Water Heaters Questions and information about the wide variety of Heating and Air Conditioning as well as Water Heater systems available are discussed here.

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  #1  
Old 07-11-2011
thardst1 thardst1 is offline
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Unhappy water coming out of overflow pipe from water heater

Excuse my ignorance of the BB systems....learning as I go, one thing after another water is coming out of the water heater overflow pipe. Checked the wh, I can't even see a way to turn off the water coming in to the wh, any suggestions appreciated, thanks, Tom
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Old 07-11-2011
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Is it flowing out or just dripping? Mine does that sometimes. I think the pressure builds in the tank when it is heated and with the one-way valves and nowhere to vent the pressure it has to go somewhere. Also, the overpressure valves get old and corroded.
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Old 07-11-2011
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Quote:
Originally Posted by thardst1 View Post
Excuse my ignorance of the BB systems....learning as I go, one thing after another water is coming out of the water heater overflow pipe. Checked the wh, I can't even see a way to turn off the water coming in to the wh, any suggestions appreciated, thanks, Tom

I had the same thing happen on mine and found that there is most likely some residue stuck in the high pressure overflow valve that is located at the top of the overflow drain pipe, it will require that you open and close the valve a few times to flush the residue out of the valve seat. The valve lever itself will be as hot as the water inside of the tank so wearing gloves is recommended.
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Old 07-11-2011
thardst1 thardst1 is offline
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I guess it's running out as a small flow, thanks for the replies, I flipped the valve a couple times, makes a little whine noise now(pressure building?), but the water is till flowing. New valve or ???
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Old 07-11-2011
thardst1 thardst1 is offline
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also can't see a shut off valve to the water heater - on my 78, where would it be? thanks, Tom
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Old 07-11-2011
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Thomas, just turn the 12 V pump off or disconnect from the city water connection.

The Temp/Pressure valve can be bought at any Lowes/HD or plumbing supply store.
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Old 07-11-2011
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As the others stated these valves get clogged and corrode. If is like ours, I'm pretty sure it a common replaceable valve available at plumbing supply house or HD/Lowes. I know I have these fail on water boilers occasionally and just take it off and swap it out.

Good chance there is no water shut off unless the original install was modified. Turn off city water and or pump.

NH Bill
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Old 07-11-2011
thardst1 thardst1 is offline
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Default guess it is bad news

rechecked the leak and actually water is coming from above, evidently feom the bottom of the heater, and flowing out and down the outside of the overflow tube.........I am hooked up to city water, and do not see a shutoff for the cold water coming in to the heater - has a strange connection, cold comes in, goes through the connection then branches off to the cold in, and into the heater, so I guess no way to just shut off the heater. Looks like new wh - thanks, Tom
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Old 07-11-2011
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Quote:
Originally Posted by NH Bill View Post
As the others stated these valves get clogged and corrode. If is like ours, I'm pretty sure it a common replaceable valve available at plumbing supply house or HD/Lowes. I know I have these fail on water boilers occasionally and just take it off and swap it out.

Good chance there is no water shut off unless the original install was modified. Turn off city water and or pump.

NH Bill
Also, open the sink faucet to release any pressure, then change out the valve.
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Old 07-11-2011
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Quote:
Originally Posted by thardst1 View Post
rechecked the leak and actually water is coming from above, evidently feom the bottom of the heater, and flowing out and down the outside of the overflow tube.........I am hooked up to city water, and do not see a shutoff for the cold water coming in to the heater - has a strange connection, cold comes in, goes through the connection then branches off to the cold in, and into the heater, so I guess no way to just shut off the heater. Looks like new wh - thanks, Tom
I do not think there is a hotwater tank water shut off valve,
unless a previous owner install a HWT by-pass for winterizing the plumbing.
Look around the tank for a few extra valves.
Talk to Stephen he will have a tank to fit in the hole.

Stephen Birtles
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http://www.dupreeproducts.com
Telephone 888 668 4288
cell 716 220 1267
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