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How to size boiler in a house that also has a wood burning stove?
I’m getting estimates from HVAC companies to replace my propane boiler (135,000 BTUh). My one story house (2,300 sq ft) also has a wood burning stove. Heat for 3/4 of the house is provided by the wood burning stove - without any help from the radiant heating system in the floor. But the heat from the stove doesn’t quite get to a couple of the rooms that are furthest away it. And in those rooms, the thermostats will occasionally command heat from the boiler.
So should the replacement boiler be sized to heat the whole house (the radiant heating system is plumbed throughout the house) or sized for only the rooms I actually heat with it (about 1/4 of the house)?
I starting thinking about this because I could tell the boiler was short cycling the other day when only two zones were turned on and commanding heat. The burners were turning on and off every 7-10 minutes. It hit me that this might be what it does most of the time during the winter because most of the zones are getting plenty of heat from the stove.