Electric hot water relief valve "spouting off"
#1
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We replaced a leaking PRV last weekend on our 18 MONTH old Whirlpool and now it is "spouting off" every 24-48 hours. It releases enough water to fill the pan about 1/4 of the way full although sometimes it is less. I know it is the valve b/c I see the water spray on the side of the tank. Of course, it won't do it while we are watching it. The hot water temperature seems fine in the home. Our water pressure in the entire home does seem higher than normal, but not excessive. Do we have a faulty PRV, tank, or could it be from the increased water pressure in the home? My husband wants to attach a pipe to the PRV and run it to the drain. Is this an option? Our old tank never "spouted off" so I am not sure it should be doing this frequently. I thought the PRV was an emergency relief valve to keep the tank from blowing up. Thanks for your help!
#2
The valve are made to open when the water temp is too high, or pressure builds up.
Have you taken a temp reading of your hot water?? Take a reading and post back.
Have you taken a temp reading of your hot water?? Take a reading and post back.
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Electric hot water relief valve "spouting off"
Water temp is 110. I am wondering if the thermomstat is intermittently sticking and causing the water to become to hot. This would account for the valve relieving the pressure at odd times (like the middle of the night) I do not have an expansion tank. Any other thoughts? Thanks!
#5
Is the 110 is what it's set at, or the reading you took?
If that's the reading, then sounds like maybe a pressure problem or maybe a faulty valve.
If you say that is what it's set at of 110, take a reading to see if it's hotter than that.
If that's the reading, then sounds like maybe a pressure problem or maybe a faulty valve.
If you say that is what it's set at of 110, take a reading to see if it's hotter than that.
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I took three actual readings. The two faucets closest to the hot water tank were both 110. The upstairs bathroom tub reading was actually 115. I took that after I sent the thread. The tank is set at 120. Would you change the thermostat "just in case"? What should we do about a pressure problem? My neighbor has not noticed a higher water pressure. By the way, we do not have a restrictor on the water coming into the house b/c the static pressure did not warrant one 20 years ago. Should we install a restrictor on the main water valve? Thanks again!
#8
Why don't you get one of those little Watts pressure gauges with the telltale hand that attaches to a hosebib? Leave it on for a day and then you could see how high is your maximum pressure.
#10
You can find these guage at Home Depot, They thread onto the outdoor facuet. and it can be found in the water heater asile near the water heater accecery (Depends on stores's lay out).
#12
This gauge is threaded like a garden hose. So you just put it on your outdoor facuet to get a reading on water preasure. Once you made your reading, just remove the gauge.
#13
You can put the gauge anywhere there is a hose thread. Like on your outside faucet or on the valve where one of your washing machine hoses is connected. It can be a little dangerous for your gauge but you can even put it on the drain valve for the water heater. If you use one with the telltale hand. you can not only see the static pressure but also the max pressure. I'm guessing you need a thermal expansion tank.
Ken
Ken
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WOW! My pressure is 110!!
No wonder I am having problems! I checked my neighbors houses b/c the town has been installing new water pipes. One neighbor is 60-62 and the other is 42. Is it strange to be so varied? Our homes are 20-25 feet apart. OK, now what?

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ok...i checked again and the pressure has dropped to 55-58psi. We do not have a regulator on the main water line. Should we put one on and if so, do we need a plumber to do this? Thanks for your help in detecting this problem.
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So, install the pressure regulator on the main valve into the house or farther out toward the street? We will look into a thermal expansion tank. We have lived here 20 years without any problems. The pressure today has been all over the place. Right now, almost midnight, the pressure is almost 90.
Thanks again!
Thanks again!
#18
When you install a pressure regulator it will have a check valve built into it that won't let water go back out of your house. Right now when the water pressure in your house is high, the relief valve on the water heater opens up and lets some out. When the regulator traps water in the house and the water heats up a tank of water, the same thing will happen. The water expands and has no place to go and pressure increases until the relief valve opens again. You will be disappointed and wonder why the problem was not fixed. At the very least, when you install the regulator, put in a tee that has a 3/4" female thread available to accept an expansion tank in the future. Then you won't have to refit the pipes when you need to put the tank in. Just put a brass plug in the tee for now. The regulator should be the first thing after your main shutoff. Some people take full pressure water to the outside faucets and then take the regulator off after that but that isn't necessary either.
Ken
Ken
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Thanks! We will call a plumber to replace the pressure regulator we found on the pipe right above the shut-off valve. Is there anything we should know about the kind of regulator they put on the pipe? Thanks again. This is an amazing web site!