regular discharge from TPR valve


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Old 02-21-19, 05:49 AM
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regular discharge from TPR valve

Too long : didnt read : Leak from overflow tube after hot water use, no other time, Thermostat or TPR replace?

Have a 3 yo propane fired water heater 45 gallon. No expansion tank.
2 days a go found a small puddle from the over flow tube, Investigation find that it discharges only after hot ware is called/ used in the house.
Only spills about a cup or two.

Tested the TPR valve, seems fine, closes opens, springs back

Should I replace the TPR valve? or go in deeper and replace thermostat?

We have never had this issue, and never had an expanstion tank attached.
 
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Old 02-21-19, 06:19 AM
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Any changes to the plumbing system including replacing the meter or adding some parts near it?

Don't do anything to the water heater besides double check the temperature knob and that should not be in the "very hot" zone for household use.

Install an expansion tank. Be sure its internal pressure is preset to approximately the normal working water pressure before turning the water back on. That will correct the problem.

Every new tankful of water will expand when heated. You might have pockets of air in the plumbing in the past that are gone now. Water does not compress so when it expands something has to give.
 
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Old 02-21-19, 06:53 AM
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system is a closed system ( PRV on main line entering home)
no changes to system other than its been cold lately
I'm going to change the TP valve today see if that remedies situation immediately, if not
then maybe the expansion tank
 
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Old 02-21-19, 04:42 PM
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system is a closed system ( PRV on main line entering home)
Then you need an expansion tank installed. There is no place for the heated water to expand to now.
I doubt replacing the T & P valve will stop the problem.
 
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Old 02-21-19, 06:05 PM
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Not all PRVs have a check valve, but some do. Most new water meters have a check valve. A Thermal Expansion Tank should solve the problem.
 
 

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