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Condensing Hot Water Boilers

The Most Efficient Condensing Boiler On The Market


The Cleaver-Brooks condensing boilers can achieve up to 99% thermal efficiency, compared to 70%-80% with conventional designs (based on the higher heating value of fuels).

Most condensing models offer efficiencies over 90% when the return water temperature is at 115 ºF or less, however, the Clearfire condensing boilers start condensing performance near 140ºF; the lower the return water temperature, the higher the efficiency gain.

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What Models and Sizes Are Available?

Clearfire-C (400 to 3,300 MBTU)

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.

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Clearfire-LC (4,000 to 12,000 MBTU)

The ClearFire®–LC integrates Cleaver-Brooks leading heat exchanger, burner and control technology into a large capacity condensing boiler solution. By combining our proven extended heating surface tube designs, our patented AluFer® tubes and exclusive spiral tubes in a true counter flow arrangement, the CFLC delivers the capacity, efficiency and reliability previously considered unattainable. 



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