DOE 2021 compliant - 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 - 105,000 BTU heating capacity - 87.1% AFUE - If boiler is fired at 1.05 gallons per hour: 147,000 BTU input - 127,000 BTU heating capacity - 86.0% AFUE - 11.75 gallons water content - Carlin EZ1HP oil burner - Cast iron sections with steel push nipples - Insulated deluxe powder coated steel jacket - Wet base section design - Taco 007 circulator - Full plate swing out burner door - Top or Rear flue outlet - Built in air elimination baffle