Heat Exchanger Brazed Plate Max BtuH (Water to Water Application) 135 000 BtuH Max BtuH (Oil to Water Application) 12 725 BtuH Max BtuH (R22 to Water Application) - 435 PSIG Design Pressure Temp (F) -40 To 300 10 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 Capacity (GPM) 50 gpm 12.2 in 1.37 in 4.37 in - 5.5 lb ASME CRN UL Includes -