Water Heater Temp

[Jadnashua]

Almost all boilers are closed systems, and require the use of an expansion tank. Same is true of any potable water system that ends up being closed.

 

[GabeS]

Almost all boilers are closed systems, and require the use of an expansion tank. Same is true of any potable water system that ends up being closed.

Aren't all potable water systems closed systems?? But not all have expansion tanks. In fact I barely see them here in NYC on no water heaters.

 

[Sponsor]

 

[Jadnashua]

No, potable water systems in many places are totally open in the sense that water from the house can flow back out into the mains. Only when you throw in a check vavle does it become closed. A PRV has one, the utility may install one either in their water meter or as part of the installation either now or in the future. They do tend to replace the meters, and newer ones often come with a check valve, thus, some municipalities require an expansion tank to be installed so there isn't a rash of service calls when their T&P valves start leaking.

T&P Valve looking at two sides.

 

[Kingsotall]

Got it. I justed wanted to say got it, but it wouldn't let me, said my message was too short. Must be at least 10 characters.

I hate that.