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Cleaver-Brooks Flexible Watertube Boilers

Cleaver-Brooks Flexible Watertube Boilers

Whether stand-alone, or utilizing a condensing/non-condensing hybrid multi-unit solution the model FLX boilers can share the load to increase efficiency in a hydronic or steam process.

The FLX is designed to handle to minimize thermal stress and provide quick response in a compact unit – field erectable units are also an option. With no requirement for FGR piping from the stack to burner, it’s easy to incorporate the FLX into a new or existing boiler system

Size Range

35-600 HP (1,500 – 25,000 MBTU/hr)


For rapid response for low or high-temperature pressure heating, back up fuel oil and field erectable. Applications include heating for universities, medical facilities, office complexes and process applications such as manufacturing, food processing and pharmaceuticals.


#2 fuel oil and gaseous fuels


15 to 150 psig


Up to 88%


Available to <9 ppm