SU309-2

this configuration is a SU/WU unit built on a removable U-tube bundle for steam-to-liquid heating. Steam condenses in the single-pass shell while the heated fluid travels the tubes. The configuration measures 30 inches across the shell, 108-inch shell length, and roughly 142-7/8 inches overall in a 2-pass arrangement. That works out to about 1289 square feet of heat transfer surface on 3/4-inch O.D. tubes. The build specifies cast iron or brass bonnets, steel shell, copper tubes, and steel or brass tubesheets. The unit is rated for 150 PSI on the shell side, 150 PSI on the tube side, and 375°F maximum temperature. This build is designated SU309-2. Typical duty includes swimming pool heating, building comfort heating, and instantaneous domestic water heating.