Just a quick question. I have a old house and currently (until next spring) on a single zone for the entire house. My coal boiler is below my living room in my basement and I expect this room to be warmer than normal because of the radiant heat that the boiler puts off. My supply side piping seems to go from the boiler to the back rooms in my lower floor and then to the living room last. My thermostat is in the living room, if my thermostat is never kicking my circulator pump on due to the excessive heat already there (it is set to 70 and it's almost always at least 72 -75 in the living room), then why are my back rooms so hot all the time?
Wouldn't ts stand to reason that if the C.P. check valves are working, then the back room would be colder than normal due to the fact that the pump isn't running because of the living room not needing heat.
So do you think I am getting thermo siphon or my C.P. check valve is malfunctioning allowing the heated water to pass by?