Heat Exchanger Brazed Plate Max BtuH (Water to Water Application) 350 000 BtuH Max BtuH (R22 to Water Application) - 435 PSIG Design Pressure Temp (F) -40 To 300 40 Plates Surface Area per Plate (Sq.-Ft.) 0.126 sq ft Volume (Gal./Chnl.) 0.0076 Construction Material ASTM 316L Stainless Steel Copper Connection 3/4 in MNPT Capacity (GPM) 25 gpm 8.2 in 3.64 in 3.18 in - 6.7 lb ASME CRN UL Includes -