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I have a GB-142/24 with Dianorm panels with TRV's and an indirect tank in a 1800 sq. ft house. My last propane bill was $390 for a month which seems excessive. There is really only one problem i see and i'm not sure if it would cause the high bill- it seems like i don't have enough radiation in the room with the buderus analog thermostat. I have a hard time hitting setpoint sometimes when it is cold out. If i have it set on 67 i might only get up to 64. All the the other room TRV's have closed and they are fine, but the boiler keeps running beacuse the thermostat room is still cool. I'm surprised with that little flow, the loop water doesn't overtemp, but it never seems to and the setpont is never hit either. Basically, it runs all the time. The house cathedral ceilings throughout, so there is a lot to heat also. Does this seem like a problem and do you view these propane costs as high for this application? thanks.