Hi. We have an old, window-heavy, poorly-insulated 5500 square foot house in Danbury, CT. One hydro-air zone (40% of the house), one radiator zone (50% of the house), and one kick heater zone (10% of the house). I've had two (reputable) companies perform a Manual-J on our home and they have come back with proposals for a 350 MBH boiler and a 400 MBH boiler (IBR). Our oil company looked at the oil consumption history of our (old, inefficient) setup and concluded that we need a 300MBH boiler (IBR). As I am reading this forum I am coming to the conclusion that all three proposals seem to be insanely oversized. Does it seem like I am missing something?