VEVOR Heat Exchanger Water to Air, 18"x 20" with 3-Row 3/8" Copper Ports, 242 Aluminum Fins Heat Exchanger for Outdoor Wood Furnaces, Residential Heating and Cooling, and Forced Air HeatingThickened InterfaceHigh Efficiency and Energy SavingDual UseMultiple Sizes AvailableHigh CompatibilitySecure to UseOperating Temperature: -40°C-180°C / -40°F -356°F,Main Materials: Copper,Maximum Working Pressure: 2.5MPa,Plate Area: 18 x 20 in / 45.72 x 50.8 cm,Heat Capacity: ≥133K BTU,Number of Aluminum Fins: 242 Pcs,Color: Gold,Model: C18×20,Number of Copper Tubes: 3-Row 3/8",Product Dimensions (L x W x H): 25.59x18.03x3.62" / 650x458x92 mm,Net Weight (with Accessories): 17.64lb / 8kg