Master Plumber . Net
The water heater relief valve leaks for four reasons, I will explain each reason in detail but first please read the following
The first reason a water heater relief valve leaks is.
The valve is old and it starts to leak, I have seen them start to leak within a years time, if your relief valve is a few years old and leaking, you should have it replaced regardless of why it is leaking.
Just a reminder replacing a water heater relief valve can be very dangerous, it may be best to have it replaced by a pro. To find a local professional plumber please call
The second reason a water heater relief valve leaks is, The water has gotten too hot, if the temperature of the water in the water heater reaches above 210 degrees F the relief valve will leak or even blow off, this is why the outlet of the relief valve must be piped to about 6 inches from the ground, you would not want to get a blast of 210 degree F water in the face.
The relief valve may leak before the temperature gets to 210 degrees F because of the extra expansion of the water as it heats.
This type of problem can be very dangerous, you can be scalded with water at a temperature of 140 degrees F. 210 degrees F is just below boiling water boils at 212 degrees F.
If your water heater is heating water to this level,
this very hot water is coming out of the faucets in your
home and you can be burned
What causes a water heater to get too hot? With an
electric water heater a bad thermostat will cause the
water heater to get too hot.
Have it looked at by a local plumber call
The third reason a water heater relief valve leaks is water pressure, the relief valve is set to relieve pressure at 150 PSI (pounds per square inch) if the water pressure in your home rises to 150 PSI the relief valve is going to leak.
Some city or municipalities have high water pressure
from their water plants so that the water gets to
everyone on the grid.
And The fourth reason a water heater relief valve
leaks is thermal expansion
With gas water heater with high recovery rates and a higher house water pressure the possibility of thermo expansion to 150 PSI increases, in this case an expansion tank needs to be installed, be sure it is an expansion tank designed for domestic water and not for a hot water boiler, there is a big difference and the boiler type will rust out within a year, and it is designed for low water pressure.
Note: Under no circumstances should you plug the end of a water heater relief valve, even temporarily, doing so can cause your home to be totally destroyed and can cause death to you and yours
Have it fixed by a local plumber call
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