5-277-12-036-001

Built around a double-wall two-pass U-bend bundle, this configuration delivers in-tank heating with boiler water in the tubes and cross-contamination protection for demanding service. The vented air gap between tube walls gives a visible telltale leak rather than allowing boiler water and tank contents to mix. Its envelope centers on a 12-inch diameter shell, 36-inch shell length in a 2-pass arrangement. It carries 3/4-inch O.D. tubes. That combination is cataloged as 5-277-12-036-001. Material selection covers cast iron bonnets, steel shell, and copper (double wall) tubes. Design ratings run to 150 PSI on the shell side, 125 PSI on the tube side, and 375°F maximum temperature. Installations range across potable water storage tanks, institutional and health care water storage, and domestic water storage under double-wall codes.