5-277-06-072-001

For in-tank heating with boiler water in the tubes and cross-contamination protection, the Diamondback tank heater line offers a double-wall two-pass U-bend bundle design; this configuration sits within that range. 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 6-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. On the ratings side, expect 150 PSI on the shell side, 150 PSI on the tube side, and 375°F maximum temperature. This build is designated 5-277-06-072-001.