Heat Exchanger Brazed Plate Max BtuH (R22 to Water Application) 30 000 BtuH 435 PSIG Design Pressure Temp (F) -40 To 300 34 Plates Surface Area per Plate (Sq.-Ft.) 0.281 sq ft Volume (Gal./Chnl.) 0.0159 Construction Material ASTM 316L Stainless Steel Copper Connection 1 in MNPT 1/2 in 7/8 in SW Capacity (GPM) 50 gpm 12.2 in 3.7 in 4.37 in - 12.46 lb ASME CRN UL Includes -