If boiler is fired at .60 gallons per hour: 84,000 BTU input - 75,000 BTU heating capacity - 87.5% AFUE - If boiler is fired at .85 gallons per hour: 119,000 BTU input - 104,000 BTU heating capacity - 86.2% AFUE - If boiler is fired at 1.05 gallons per hour: 147,000 BTU input - 126,000 BTU heating capacity - 85.0% AFUE - 12 gallons water content - Beckett oil burner - Cast iron sections with steel push nipples - Insulated deluxe powder coated steel jacket - Wet base section design - Full plate swing out burner door - Top or Rear flue outlet - Built in air elimination baffle - Boiler reset control with low water cut off