5-277-08-072-001

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. Dimensionally it is a 8-inch shell unit in a 2-pass arrangement. It carries 3/4-inch O.D. tubes. Material selection covers cast iron bonnets, steel shell, and copper (double wall) tubes. Operating limits are 150 PSI on the shell side, 150 PSI on the tube side, and 375°F maximum temperature. This build is designated 5-277-08-072-001. Typical duty includes potable water storage tanks, domestic water storage under double-wall codes, and institutional and health care water storage.