sorry for the non-wood-burning nature of this question (sort of wood burning related since it is about back-up heat to a wood stove) but can't help but avail myself of the collective knowledge of this forum. I want to heat a part of the house that wasn't previously heated. I have a steam boiler and steam heat in the house. I was thinking I would simply set up hot water heat for this room-- a circulator controlled by a thermostat in the room. my boiler produces domestic hot water, so I'd simple run off of that to a circulator, through radiator and back. Is there any problem with this-- i.e. with returning domestic water that's run through a circulator/radiator back to the domestic water supply?