DOE 2021 compliant - If boiler is fired at .95 gallons per hour: 133,000 BTU input - 117,000 BTU heating capacity - 87.0% AFUE - If boiler is fired at 1.25 gallons per hour: 175,000 BTU input - 154,000 BTU heating capacity - 87.1% AFUE - If boiler is fired at 1.50 gallons per hour: 210,000 BTU input - 183,000 BTU heating capacity - 86.1% AFUE - 14.75 gallons water content - Riello F5 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