14,000 BTU input to 199,000 BTU input - 13,000 BTU heating capacity to 187,000 BTU heating capacity - Can be used with natural or LP gas without a conversion kit - 2.50 gallons water content - Inox-Radial stainless steel heat exchanger - MatrixPlus stainless steel cylinder burner - 7 inch color touch screen boiler control display - Multi-function outdoor reset boiler and system control - Variable speed circulator - 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 double pipe vent systems, or single wall venting - 3/4 inch condensate drain connection