water heater putting out scalding hot water


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Old 07-24-09, 08:31 PM
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water heater putting out scalding hot water

my 11 year old water heater let a lot of water out of the release valve pipe. is it a thermostat problem?
i lowered the temp and so far it has helped.
it happened when we were at work and since we 've been home 2 showers have been taken with no more water to be seen
if i need to replace heater can i use the shark connectors to connect pipes?
 
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Old 07-25-09, 01:48 PM
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First off, is this a gas or an electric WH?

It's something that can be easily repaired and wouldn't warrant replacing the WH over.
 
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Old 07-27-09, 07:13 PM
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water heater puts out scalding water

Mine is doing the same thing. It is electric. Is this a thermostat issue?
 
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Old 07-27-09, 07:37 PM
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Definitely a thermostat that stuck in the closed position, keeping the element on after the desired temp. was reached.

Could have been either one. It may happen again, or it may not.

Personally, I would leave it a lone for now, but if it happens again, replace both 'stats.
 
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Old 07-27-09, 07:41 PM
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The T&P valve (temperature and pressure relief) will open for 2 reasons. Temperature over its setpoint, usually just under boiling point, or too much pressure.
Over temp is usually caused by a stuck aquastat, and is fixed by replacement of the device, a bit harder on a oil / gas fired tank.

Over pressure can be caused by the tank heating water that has no place to expand, usually this will not develop as a problem over time, but can be caused by a new city water meter, or a check valve that was added recently.

Over pressure can be diagnosed by using a pressure gage on the water system, we use a hydronic pressure test kit (usually readily available) with a higher pressure guage on it. This can be screwed onto a laundry tap and left on to monitor it thru the day.

Over temp will show itself as a lot of steam for obvious reasons.
 
 

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