I have a 1400 sqft house that's 2 floors. the first floor is 800 sqft and the second floor is 600 sqft. I plan on using baseboard heat. The house is a cape that was reinsulated with R 36 a few months a go
you will need a little more information like what is your climate area (coldest temp outside that it gets) the type, style and how many outside windows,doors,the amount of insulation in the outside walls and roof,the height of you ceilings,is there a heated garage attached or not,and the best of all do you plan on getting your hot-water off this boiler and if you do is it to be a coil which is inside of the boiler or are you going to add a indirect water heater which is piped to the boiler a person could guess and say around 120,000 btu boiler but guessing is not what we do right,if you can't get your heating company to come and do a heat loss calculation on your home you might be able to take all this information that you collected and bring it to a big box store lowes,home depot, or another and they will do it for you or look up heat loss on the web
