ClearFire®-CE (CFC-E) Condensing Hot Water Boiler
High-Efficiency Condensing Hot Water Boiler
Input Range: 2,500,000 to 6,000,000 BTU/hr
Fuel: Natural Gas
Standard Turndown: 10:1
Applications: Commercial and industrial heating, process hot water, and hydronic heating systems
The Cleaver-Brooks ClearFire®-CE (CFC-E) is a high-efficiency condensing firetube hot water boiler featuring a large water capacity, duplex stainless steel pressure vessel, and advanced TurboFer® heat transfer technology. Its design combines high condensing performance, low waterside pressure drop, system flexibility, and a compact footprint.
The CFC-E is suitable for both new installations and retrofit projects. Its large water capacity and dual-return design support high ΔT and primary variable flow systems, helping reduce system flow rates and pumping energy while maximizing condensing performance.
Product Overview
High-Efficiency Heat Transfer
The ClearFire®-CE utilizes Cleaver-Brooks TurboFer® technology to create turbulence within the firetubes, improving heat transfer between the flue gas and heat transfer surfaces.
Combined with AluFer® tube technology, the design significantly increases the effective heat transfer surface area while providing excellent thermal conductivity. This allows the CFC-E to achieve high condensing performance and energy efficiency within a compact boiler footprint.
Flexible Hydronic System Integration
The CFC-E features a large water capacity pressure vessel designed to withstand thermal shock and accommodate high ΔT system designs. Dual returns allow different return-water temperatures to enter the boiler separately, helping maximize condensing performance and providing greater system design flexibility.
Low waterside pressure drop helps reduce pump head requirements and pumping energy, while making the boiler well suited for primary variable flow applications.
Advanced Burner and Controls
The linkage-less burner provides fully modulating operation with a standard 10:1 turndown ratio, allowing boiler output to closely match system demand without the use of complex mechanical air/fuel linkages.
The integrated control system monitors burner operation, fan speed, boiler water temperature, safety interlocks, and other critical operating conditions. Integrated O₂ trim capability can continuously optimize the air-fuel ratio based on measured flue gas oxygen levels.
Features
Large Water Capacity and Dual Returns
Provides greater system engineering flexibility and supports high ΔT and condensing applications.
Duplex Stainless Steel Construction
Provides excellent strength and corrosion resistance for long-term condensing boiler operation.
TurboFer® and AluFer® Technology
Advanced heat transfer technologies increase effective heat transfer and improve condensing performance.
10:1 Turndown
The fully modulating linkage-less burner provides a standard 10:1 turndown ratio to closely match changing system loads.
Low Waterside Pressure Drop
Reduces pump head requirements and helps lower system pumping energy consumption.
Compact Boiler Footprint
Only approximately 3 inches of side clearance is required, helping maximize available boiler room space.
Hinged Burner
Provides convenient access to burner components for inspection and maintenance.
Integrated O₂ Trim
Supports continuous combustion optimization for improved operating efficiency.
Quiet Operation
Sound level is less than 70 dBA measured at 3 feet from the boiler.
Non-Prorated Warranty
Backed by Cleaver-Brooks warranty coverage without prorated reduction.
Heat Transfer Technology
TurboFer® Technology
TurboFer® technology increases turbulence within the firetubes, improving contact between the hot flue gas and heat transfer surfaces. This enhances flue-side heat transfer and contributes to the boiler's compact, high-efficiency design.
AluFer® Tubes
AluFer® tube technology combines high thermal conductivity with corrosion-resistant construction. The design significantly increases the effective heat transfer surface area and helps maximize heat recovery from the flue gas.
Condensing Operation
When return-water temperatures are sufficiently low, water vapor in the flue gas condenses on the heat exchanger surfaces and releases latent heat that would otherwise be lost through the exhaust.
Low return-water temperatures, high ΔT system designs, and primary variable flow operation can increase the amount of time the boiler operates in the condensing range, improving overall system efficiency.
System Design
Dual-Return Configuration
The dual-return arrangement allows higher- and lower-temperature return water to enter the boiler separately. Directing lower-temperature return water to the appropriate section of the heat exchanger helps maximize flue gas condensation and heat recovery.
High ΔT Systems
The large water capacity and thermal-shock-resistant pressure vessel support systems with wider supply and return water temperature differences. A higher ΔT can reduce the required system flow rate for a given heating load, potentially reducing pipe sizes and pumping energy.
Primary Variable Flow
The CFC-E is designed to take advantage of primary variable flow pumping systems. System flow can vary with actual heating demand, reducing unnecessary pumping and bypass flow while improving overall plant efficiency.
Retrofit Applications
With its compact footprint and minimal side-clearance requirements, the CFC-E is well suited for existing boiler room upgrades and replacement of older non-condensing hot water boilers.
Technical Data
Key Specifications
| Item | Specification |
|---|---|
| Boiler Type | High-Efficiency Condensing Firetube Hot Water Boiler |
| Input Range | 2,500,000 to 6,000,000 BTU/hr |
| Fuel | Natural Gas |
| Burner Control | Fully Modulating Linkage-Less Burner |
| Turndown Ratio | Standard 10:1 |
| Pressure Vessel | Duplex Stainless Steel |
| Return Configuration | Dual Returns |
| Control Features | Integrated Boiler Controls, Burner Management and O₂ Trim Capability |
| Sound Level | Less than 70 dBA at 3 ft |
| Side Clearance | Approximately 3 in. |
Actual boiler capacity, operating pressure, supply and return temperatures, flow requirements, efficiency, and emissions performance should be verified according to project-specific selection data and current Cleaver-Brooks documentation.
Solutions & Applications
Solutions
Energy Efficiency
High condensing performance helps reduce natural gas consumption and overall boiler operating costs.
Reduced Pumping Energy
Low waterside pressure drop and high ΔT capability can reduce system flow requirements and pumping energy.
System Flexibility
Large water capacity, dual returns, and primary variable flow capability provide flexibility for a wide range of hydronic system designs.
Boiler Room Space Savings
The compact footprint and minimal side-clearance requirements make the CFC-E particularly suitable for space-constrained mechanical rooms and retrofit projects.
Typical Applications
ClearFire®-CE boilers are suitable for commercial and industrial hot water applications, including office buildings, hospitals and healthcare facilities, hotels, educational facilities, industrial process hot water systems, central heating plants, and boiler retrofit projects.
Maintenance & Operation
Serviceability
The hinged burner design provides convenient access to burner components for inspection and service. The compact and integrated equipment arrangement also simplifies routine maintenance while minimizing required boiler room service space.
Operation
Installation, commissioning, combustion setup, and scheduled maintenance should be performed by qualified personnel in accordance with Cleaver-Brooks procedures. Gas pressure, combustion conditions, fan speed, flame signal, flue gas O₂ and CO, and applicable safety interlocks should be verified and documented during commissioning and service.
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