Heat Exchanger Brazed Plate Max BtuH (R22 to Water Application) 60 000 BtuH 435 PSIG Design Pressure Temp (F) -40 To 300 28 Plates Surface Area per Plate (Sq.-Ft.) 0.566 sq ft Volume (Gal./Chnl.) 0.0273 Construction Material ASTM 316L Stainless Steel Copper Connection 1 in MNPT 7/8 in SW Capacity (GPM) 50 gpm 20.7 in 3.12 in 4.37 in - 18.48 lb ASME CRN UL Includes -