Cleaver-Brooks | Products & Solutions | Boilers | Commercial and Condensing | ClearFire®-C


Fully Condensing

  • Fully condensing hydronic boiler
  • 500 to 3,300 MBTU
  • Natural gas and propane
  • 125 psi
  • Standard less than 20 ppm NOx

The ClearFire-C fully condensing hydronic boiler is a vertical down-fired design offering high efficiency and low NOx technology.

The ClearFire-C is a vertical down-fired, stainless steel, fully condensing boiler, available in seven sizes.  The AluFer® tubes with fireside extended heating surface provide maximum heat transfer for superior performance in a compact package. 

This unit will offer up to 99% efficiency at low fire and 97% at high fire, with 80°F return water temperature.

The modulating premix burner control automatically adjusts the air/gas mixture for maximum efficiency.  The linkageless burner provides up to 5:1 turndown. 

The dual return feature allows condensing performance even with standard 180°/160°F design systems, with as little as 10% flow at 130°F or less from a low-temperature source.

The ClearFire-C comes standard with the Falcon touch-screen total boiler control to most efficiently operate your boiler system.   


  • Stainless steel combustion chamber, tubes, and tube sheet
  • Dual temperature return for additional energy savings potential
  • Optional dual gas train for critical backup fuel source
  • Falcon total boiler control with lead lag capability up to 8 boilers
  • Fresh air inlet connection for sealed combustion
  • Low hydraulic resistance
  • Waterside inspection
  • Hinged burner for easy access
  • Thermal shock resistance
  • cULus listed for natural gas and propane
  • Quiet:  <70 dBA sound level at 3 feet

For .dwg and .dxf drawing viewer download the AutoDesk TrueView.

Select one of the models listed below.


  • Lower Fuel Cost
  • Lower Emissions
  • Hot Water Solution


  • Building Heat
  • Education
  • Hospital and Healthcare

Featured Product


The model FLX Flexible Watertube Boiler is designed to minimize thermal stress and provide quick response in a compact unit. There is also a field-erectable option.

Related Products & Accessories

Case Study

Effects of Ultra-High Turndown in Hydronic Boilers

Today, hydronic boilers are producing greater efficiencies than previously thought possible, all due to the advancements of condensing technology. It is the science behind condensing that many people do not take the the time to understand, which can lead to misunderstandings and the perpetuation of myths. One of the largest areas of confusion concerns high turndown.