I have it all (at least in the heatin world! ) 4500 pro heat to pre heat eng.and for in floor radiant heat,forced air rads.works great in the cold .You can get the bus up to 75 f easy off eng. or boiler. most nights at 20f or higher we don't need any heat.The radiant heat of the drive all day is lots. But when more is needed I turn on the rv propane wall furance 12000 btu (small unit but works good ) .The radiant heat only works good for the long cold drives.It takes hours to heat up walls floors, inside cabinets that's why when we are in a warmer climate I use a 120 volt cube heater,off gene for the heat up fast times that only last a hour or two . So in a nut shell ,radiant for a long cold time or propane or cube for short blasts. dave
I have to agree with TomC though not a huge fan of the rv furnaces the propane fired boilers are a lot cheaper to run than a diesel fired unit on the average of 5 or 6 gals of fuel a day at over 4 bucks and going up plus the propane boilers don't sound like a helicopter running and stinking lol