We have a 1400 sq ft ranch. It's been insulated r13 walls, r40 attic, copper pipes with baseboards. We're replacing the 40 year old boiler. We'be gotten one quote on a buderus g215 boiler which seems hugely oversized. Is this because of the 40 gal indirect we are going to add? Actually every oil boiler out there seems oversized...even the cheesy method of 30mbtu/sq ft puts our heat loss at 40 or so. While I have been doing lots of reading this is still a daunting task. For our new system (one zone) what sort of options should we be seeing from contractors? I.e. any buffer tanks, outdoor resets, etc.?