Overview: 65kBtu CAPACITY: This water to air heat exchanger can heat your air at up to 65,000 Btu per hour. 12x15 GALVANIZED STEEL CASING; 1" COPPER SWEAT CONNECTIONS: A strong steel casing surrounds the body of the heat exchanger for support. HIGH QUALITY ALUMINUM AND COPPER: 12 aluminum fins per inch and 3 rows of 3/8" seamless copper tubes maximize heating or cooling efficiency. FREE 1-YEAR WARRANTY: Our product comes with a 1-year warranty to cover manufacturer defects. APPLICATIONS: These can be used for Outdoor Wood Furnaces, Residential and Commercial Heating and Cooling, Forced Air Heating, Hybrid Systems, Air Conditioning, Dehumidification, Inverter Cooling