Re: O/T HOT WATER HEATER POP OFF VALVE

Posted by wdTom on January 05, 2007 at 18:32:58 from (155.212.222.207):

In Reply to: O/T HOT WATER HEATER POP OFF VALVE posted by G Elliot on January 05, 2007 at 16:44:37:

Measure the temperature of your hot water by running it into a tin can or such with an oven thermometer in it. If it isn't near where the water heater is set and or it is too high, reset the waterheater. The cooler you set it the less it will cost to heat your water. 120 is common. You shouldn't neet to go over 140 I don't believe. If this is OK check the pressure in the system with a gauge you know is somewhere near new or reads right. If it is OK, probably not more than 50 or 60psi at most, then it is probably a defective T&P valve. They aren't that expensive, I would buy another rather than try adjusting that one unless you can set it up, " on the bench" so to speak, using a known good gauge. If you have a pump and pressure tank system, that is your own well, you already have an expansion tank in the system. You can check it to see there is an "air coushion" in the tip of it to allow for expansion and to be compressed by the pump as it builds pressure in your system. To test, notice if when your pump comes on it runs for 10 or 15 seconds or so. You should run water until the pump kicks in, then turn off the water and see hown long it takes for pressure to build and the pump shut off. If this only takes a few seconds or no time, you need to put some air in the tank. If it is sealed andhas a bladder, possibly the bladder is broken. If it is just a tank, no bladder you need to add air from time to time anyway. Water absorbs the air over time and caused the pump to short cycle. Most tanks have a air valve like a tire valve in them. If you add too much to a bladder tank you can rupture it. I don't remember how to do it right.

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