I'm about to convert from oil to gas and have been looking at condensing boilers. The main house (1950) is 1100 sq ft and there's an in-law attachment (1990) of about 1100 sq ft also. Total fin tube baseboard = 135 feet.The main house piping is run in series (I think they called it venturi back then) the in-law is the typical one supply pipe one return pipe.In your opinion does a condensing boiler make sense for this application? I'm not 100% convinced.Thanks,
just make sure you use outdoor reset with the baseboard system so that the condensing function will work. I would also have a heat loss done on the house to make sure you size the boiler correctly.
There are a number of very good Modulating Condensing gas boilers on the market.
Viessman, Buderus, Triangle Tube, Burnham Alpine, Ray, Weil-McLain Ultra and the list goes on.