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Product Spotlight



FlexCore Symmetrical Firetube boilres bring hydronic heating products to unprecedented levels of operating efficiency.


FlexCore was designed, developed, and engineered by the experts at RBI.


Engineered for performance and longevity, FlexCore utilizes a perfectly temperature-balanced heat exchanger that provides not only the highest efficiencies, but also a durability beyond that of any competitive firetube boiler on the market.



  • Sizes from 850 MBH to 6,000 MBH
  • 96.8% AHRI Certified
  • Up to 99% maximum efficiency
  • Primary/Secondary, Full Flow, and Variable Flow systems
  • Superior durability
  • Easy installation & maintenance
  • Versatile footprint fits through 36" door (all size models)
  • PVC & Polypropylene (PP) vent


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Product Spotlight