Integrated inside of the pressure vessel, the counterflow device improves boiler efficiency without increasing the heat transfer surface area and flue gas pressure drop through the boiler. The device acts as an economizer and aids absorption of more heat from exhaust gases by utilizing feedwater potential in a water-to-flue gas counterflow design. The optional device is factory-built into the company’s Thermal Master counterflow boiler series and can be added to any of its packaged Scotch Marine and Euro Series boilers. It performs the same function as a traditional external economizer typically used with conventional steam generation systems.
Hurst Boiler & Welding Co. Inc.