Don't despair yet, there's lots of expertise here to get you dialed in. That SF260 kicks out 130K btu's and unless you are trying to heat a mansion, it can and will work. You just need some tweaking, fine adjustment and balancing. Also know that Harman under rates their boilers. If it's rated at 130K, I guarantee you it's producing more than that.
Tell us about your original heating system ( radiators, baseboard), tell us about your house (size, age, insulation), tell us the details of your settings etc. on the coal boiler(temp, chimney, barometric damper, size coal you are using, burn times). Pics of the installation would be very helpful.
By the way, I'm heating 4,000 sq. ft. with a 95,000 btu stoker boiler.
Last edited by coalkirk
on Thu Dec 24, 2009 11:18 am, edited 1 time in total.