5-277-12-078-001

Configured for in-tank heating with boiler water in the tubes and cross-contamination protection, 5-277-12-078-001 carries the double-wall two-pass U-bend bundle construction that defines the Diamondback tank heater range. 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, 78-inch shell length in a 2-pass arrangement. It carries 3/4-inch O.D. tubes. The build specifies 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 glycol-fed storage heating, domestic water storage under double-wall codes, and potable water storage tanks.