FlexCore Up to 99% Maximum Efficiency

Full Modulation


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

Unlike other manufacturers; from start to finish the FlexCore was designed, developed and engineered by the experts at RBI.

Engineered for performance and longevity the 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.

Features and Benefits:
  • Up to 99% Maximum Efficiency
  • 850 - 9,000 MBH
  • 95%+ AHRI Certified
  • Symmetrical Firetube Heat Exchanger
  • Variable Volume Flow
  • Full Modulation
  • Patented "Turbo Pilot" Ignition
  • HeatNet 3.0 Integrated Control Platform
  • Touchscreen Programming & Diagnostics
  • Low NOx & CO
  • Modern Jacket Design
  • Superior Durability
  • Easy Installation & Maintenance