12,000 BTU input to 120,000 BTU input - 11,000 BTU heating capacity to 113,000 BTU heating capacity - 3/4 inch male tankless water connections - 3.3 gallons per minute continuous hot water at 77 degree rise - 3.7 gallons per minute maximum hot water - Can be converted to LP with included LP kit - 1.02 gallons water content - Inox-Radial stainless steel heat exchanger - MatrixPlus stainless steel cylinder burner - 3.5 inch boiler control display - All pipe and electrical connections are on the bottom - Serviceable components are accessible from the front - Built in automatic frost protection - Horizontal or vertical sealed combustion, hybrid sealed combustion, single, or double pipe vent systems - 3/4 inch condensate drain connection