Building and Construction

New ClearFire®-CE Condensing Boiler Has Dual Returns, Achieves Up To 99% Efficiency

24 August 2017

Cleaver-Brooks designed the ClearFire®-CE (CFC-E) condensing boiler with an enhanced AluFer® firetube heat exchanger and dual temperature returns. When utilized, dual temperature returns increase condensing in a hot water boiler, raising efficiency by 6% or more compared to a traditional single-return design. This means the CFC-E can achieve up to 99% efficiency.

The dual-return feature also offers system engineering flexibility for efficient integration into any building design. In addition, the CFC-E can be easily incorporated into a retrofit design or a new construction project because there are no flow limitations to consider. Optimum efficiency can be achieved without the need to satisfy multiple-boiler design constraints.

Another design aspect that makes the CFC-E easy to engineer is its large-water-volume pressure vessel with low pressure drop. This type of design eliminates flow restrictions and reduces system-pumping energy.

The low-flow-tolerant design makes the CFC-E ideal for primary-variable-flow pumping systems and protects the boiler from overheating or potential erosion issues due to higher flow rates. Due to the CFC-E’s high delta-T compatibility, it can handle the lowest possible return water temperature, increasing its condensing potential and operating efficiency.

A low-emissions premix burner is built into the CFC-E. The self-regulating, gas valve/venturi system, combined with ECM variable-speed blower technology delivers true linear modulation control with optimum turndown for hydronic systems. The burner automatically adjusts for combustion air density changes, resulting in a consistent fuel-air-ratio performance without additional actuators and controls.

The CFC-E features the Falcon control that has a built-in ability to control lead-lag, outdoor air reset, automatic isolation valves, primary pumps and BMS integration.

Constructed of duplex stainless steel, the CFC-E performs well in hydronic systems with a variety of design temperatures. It features excellent corrosion resistance and can withstand thermal stock.

The CFC-E fits through a standard doorway, and the side casings can be removed easily for passage through tight-access areas. Multiple units can be mounted side-by-side, allowing for a small installed footprint.

All of the boiler’s components are fully integrated, pre-programmed and factory-tested for plug-and-play operation.

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Discussion – 1 comment

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Re: New ClearFire®-CE Condensing Boiler Has Dual Returns, Achieves 99% Efficiency
2017-Sep-06 11:33 AM

The 99 percent efficiency caught my eye. Besides flue/exhaust gas ( CO,CO2,NOx,etc.) ; measuring the combustion efficency measurement has been a constant through my career. Most often have used Enerac's to measure both.

Pat Dwyer

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