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Old 01-19-2016, 08:22 PM   #16
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new code for water meter installations ..dual check valves required and pressure regulators if incomming pressure is to high ...1991... so if any home has a pressure regulator, or check valve in the system ..that makes it a closed system..which requires a thermal expanison tank in the system to absorb thermal expanison of heated water from water heater......
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Old 01-19-2016, 08:31 PM   #17
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when you have an rpz on the main, yes expansion tank is needed, but not just for a hot water heater...
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Old 01-19-2016, 08:33 PM   #18
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Quote:
Originally Posted by TheEplumber View Post
Since he has a PRV he has a closed system. Previous history aside, I'm betting it is now a code requirement for his jurisdiction
I agree if code changes you can put one in, but op didnt state in first post and systems been fine for how many years...
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Old 01-19-2016, 09:05 PM   #19
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Basic physics when you heat something it expands. On a closed system if it has no where to go it will trigger the T&P on the hot water tank to start tripping off. A Pressure reducing valve normally has a bypass back to the water provider. But the problem is it eventually clogs then T&P trips and stuff gets wet.
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Old 01-19-2016, 09:38 PM   #20
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I missed that the op had a prv in the main...
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