5-277-14-042-001

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. Its envelope centers on a 14-inch diameter shell, 42-inch shell length in a 2-pass arrangement. It carries 3/4-inch O.D. tubes. As furnished, materials include cast iron bonnets, steel shell, and copper (double wall) tubes. On the ratings side, expect 150 PSI on the shell side, 125 PSI on the tube side, and 375°F maximum temperature. This build is designated 5-277-14-042-001. Typical duty includes institutional and health care water storage, glycol-fed storage heating, and potable water storage tanks.