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The NEW K2 Firetube boiler is an addition to the K2 high-efficiency series. Joining the K2 Watertube boiler, the K2 Firetube features a stainless steel vertical firetube heat exchanger and is available in six sizes. A combi version is also available (155 MBH)! All models can be wall-hung and feature 5:1 modulation. The boiler’s dimpled, firetube heat exchanger provides lower pressure drop when compared to water-tube heat exchangers of similar capacity.

  • 95% AFUE – high efficiency and low emissions!
  • Six wall hung models
  • 85, 110, 155, 205, 270 MBH
  • 155 MBH combi model available! ?Best-in-class DHW performance
  • Field proven, stainless steel fire tube heat heat exchanger
  • Advanced Sage 2.2 Boiler Control provides “out-of-the-box” high performance and easy setup
  • Ergonomically angled touch screen display simplifies installation, operation, and diagnostics
  • Easily connects to optional Sage Zone Control for additional energy savings, system optimization, and “short cycle” prevention
  • FULL SIZE easy access side service panel
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