5-277-12-060-001

this configuration is a Diamondback tank heater unit built on a double-wall two-pass U-bend bundle for in-tank heating with boiler water in the tubes and cross-contamination protection. The vented air gap between tube walls gives a visible telltale leak rather than allowing boiler water and tank contents to mix. The configuration measures 12 inches across the shell, 60-inch shell length in a 2-pass arrangement. It carries 3/4-inch O.D. tubes. That combination is cataloged as 5-277-12-060-001. As furnished, materials include cast iron bonnets, steel shell, and copper (double wall) tubes. Operating limits are 150 PSI on the shell side, 125 PSI on the tube side, and 375°F maximum temperature. Typical duty includes institutional and health care water storage, potable water storage tanks, and glycol-fed storage heating.