SwitchFire® Boiler

Condensing Hydronic Boilers

  • Input Capacity (MBH): 6000, 10000, 12000
  • Steam or Hot Water: Hot Water
  • Vessel Design: Firetube
  • Number of Passes: 2
  • Design Temperature (deg F): 210
  • Fuel: Natural Gas, #2 oil, Propane, Combination Firing
  • Emissions (ppm NOx): <30 standard, lower emissions optional
  • AHRI Thermal Efficiency (%): 96.3
  • AHRI Combustion Efficiency (%): 95.6

  • Fully condensing high-mass firetube boiler
  • 316L stainless steel construction
  • Utilizes proprietary "EX" firetube design
  • Dual-fuel condensing - gas with #2 oil back-up
  • Gas-only condensing with premix burner
  • Robust, industrial design
  • 6000 to 12,000 MBH capacities
  • Low NOx emissions standard


Designed for use in variable flow primary systems, the SwitchFire® boiler is a high-mass, fully condensing firetube boiler constructed of 316L stainless steel. The boiler is designed to handle variable flow pumping with a low waterside pressure drop and large water volume. With its dual-fuel (natural gas and #2 fuel oil back-up) capabilities, as well as a variety of other fuels, the SwitchFire is well suited for healthcare applications and other facilities requiring redundancy with alternate fuels. With its Weishaupt burner and controls, the SwitchFire offers industry leading efficiencies and performance with both natural gas and #2 fuel oil firing. The SwitchFire is also available as a gas only boiler with premix burner featuring up to 15:1 turndown and inherent low emissions.


  • Product Overview
  • Related Resources
  • Applications
  • Fully condensing with up to 98% efficiency 
  • Weishaupt burner with gas and oil capabilities
    • Up to 6:1 fully modulating turndown
    • Sub 30 ppm NOx standard when firing natural gas
  • Premix burner for gas only operation
    • Up to 15:1 fully modulating turndown
    • Sub 20 ppm NOx standard with optional 7 ppm NOx
  • No minimum return water temperature for maximum efficiency


The SwitchFire integrates Cleaver-Brooks leading heat exchanger, featuring stainless steel EX rifled tubes, with proven burner and controls technology for a robust, reliable, efficient product. The SwitchFire’s burner design allows for efficient, low emissions operation when firing both gaseous fuels and #2 oil.

The History of Hydronics→


Controls Strategies for Maximizing Condensing Boiler System Efficiency →

Learn basic boiler control strategies and staging methods to maximize boiler operating efficiencies.

Why Ultra-High Turndown Is Bad For Hydronic Condensing Boilers →

Learn about optimized system efficiency, why matching boiler and pump turndown is critical to maintain the delta T and maximize efficiency.

  • Healthcare Facilities
  • Building Heating
  • Manufacturing Processes
  • Colleges & Universities