Electric Rheem water heater relief valve keeps running water out


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Old 05-19-16, 08:46 AM
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Electric Rheem water heater relief valve keeps running water out

I need some help. Here is some info on my water heater.
Model: 82V52-2
MFG Date - 04/2008 --- 50 gallons.

I have used 5,000 extra gallons of water this month and found this this letting a lot of water out lately. I went out and bought a New Relief Valve and installed it. Woke up this morning and the floor was wet and water was coming out of the valve after my shower. I have noticed more water pressure than normal the past 2 months. Ideas to what is causing this thing to run? I also completely drained the water heater when I replaced the valve on the top of the tank to get the lime out.

What do I do next?
 
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Old 05-19-16, 08:56 AM
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Did you take an actual reading of the water pressure in the house? It should be around 60 psi.
 
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Old 05-19-16, 08:59 AM
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So just buy a Water pressure tester and try that? Like, one that screws onto the Laundry hose? Can I test on that hose or the outside faucet?
 
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Old 05-19-16, 09:07 AM
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Yes.... a laundry valve or outside faucet would be fine.

3/4 in. Plastic Water Pressure Test Gauge-DP IWTG - The Home Depot

Does the water appear excessively hot coming out of the faucets ?
 
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Old 05-20-16, 05:42 AM
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No, normal heat. Isn't really that hot.
Thanks, I get that and see if it reads around 60. I guess if more than like 70 then I have a problem?
 
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Old 05-20-16, 08:10 AM
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Ok.... so it appears to be just a pressure issue.

You may have a pressure reducing valve near the water meter that could have gone bad causing high pressure. If you do have a PRV you should have an expansion tank in the cold water line....usually but not always.... near the hot water heater to allow for water expansion.
 
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Old 05-20-16, 08:28 AM
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Yeah, I have one of those big blue tank expansions valves on the cold water coming into the Water Heater. I'll check the regulator out if the pressure reads too high and maybe adjust the regulator first?
 
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Old 05-20-16, 02:19 PM
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The air cushion in the expansion tank may have been lost, either having leaked out slowly via the top air valve or having been absorbed by the water through a torn (now defective) bladder or diaphragm. Then for each new tankful of water heated, the water expands and some is forced out the temp/pressure relief valve.

But I would not think you would waste 5000 gallons a month that way.

Being sure the expansion tank is repressurized correctly is a multi step process starting with closing the main cold water valve, opening a faucet and letting the system depressurize. With the faucet still open, pump air into the top of the expansion tank and set its pressure to slightly below what the normal water system pressure was at faucets when no one is using water.

Do not bleed air from expansion tanks or pressure tanks to correct overpressure problems elsewhere in the system.

I hope to God you shut off the water heater power before you drained the water heater tank and refilled the tank to the point that water was gushing from a hot faucet upstairs before turning the power back on.
 

Last edited by AllanJ; 05-20-16 at 02:35 PM.
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Old 05-20-16, 02:45 PM
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Bought that meter from Home Depot. Screwed it on the closest outside faucet from the meter... reads 160!!!! Wow. Must be a problem
 
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Old 05-20-16, 03:32 PM
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Did you call the water company?
 
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Old 05-20-16, 03:51 PM
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Wow.... that is really high for city water.
 
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Old 06-01-16, 09:54 AM
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reads 160!!!! Wow. Must be a problem
Most T&P relief valves are rated at 150 PSI so you probably have a constant flow. I would think that most likely the bladder in the expansion tank is bad and that a check valve in the water meter has created a closed system which alllows the cycling water heater to build the pressure within the closed system to 160 PSI. As the water heats it expands and pressure goes up.
 
 

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