Gas
Low-NOx Condensing Gas Storage Water Heater – PRO Series
- Thermal efficiency ≥107%
- NOx < 30 mg/m³
- 30–99 kW
Gas
Commercial Condensing Premix Storage-Type Fire-Tube Boiler
A condensing, fully premixed fire-tube boiler with built-in water storage that works as both a hot water boiler and a heating boiler for hotels, factories, airports, schools, hospitals and other institutional buildings.
- 240–700 kW
- NOx 22.3–24.7 mg/m³
- Modulation up to 12:1
- 2-year warranty
Key features
Dual function
Works as both a hot water boiler and a heating boiler.
Simplified system
Built-in water storage for direct hot water supply, with no external storage tank or plate heat exchanger required, which reduces overall system cost. The primary-side pump is integrated in the boiler.
Combustion
Full premix combustion with a constant air-fuel ratio and adaptive control that resists gas pressure fluctuations; modulation ratio up to 12:1.
Low maintenance
Vertical alloy fire-tube heat exchanger designed to avoid flue and water blockage.
Warranty
2-year warranty.
Technical specifications
Technical specifications
| Model | CBF240 | CBF350 | CBF700 |
|---|---|---|---|
| Rated power (kW) | 240 | 350 | 700 |
| Burner output, 50/30 °C (kW) | 25.6–245.2 | 39.2–358.3 | 75.6–714.5 |
| Burner output, 80/60 °C (kW) | 24.3–232.8 | 34–339 | 66.5–679.2 |
| Thermal efficiency, 50/30 °C (%) | 102.4 | 102.6 | 102.6 |
| Thermal efficiency, 80/60 °C (%) | 97.8 | 97.2 | 97.4 |
| Thermal efficiency at 30% output, 30 °C return (%) | 104.2 | 104.4 | 104.7 |
| Gas type | Natural gas | Natural gas | Natural gas |
| Gas pressure (Pa) | 3000–5000 | 3000–5000 | 3000–5000 |
| Maximum flue length (m) | 30 | 30 | 30 |
| Flue material | PP / stainless steel | PP / stainless steel | PP / stainless steel |
| Gas consumption (m³/h) | 24.1 | 34.8 | 69.2 |
| NOx emissions (mg/m³) | 22.3 | 24.7 | 24.7 |
| Maximum operating pressure | Atmospheric | Atmospheric | Atmospheric |
| Width A / height B (mm) | 710 / 1750 | 1000 / 1750 | 1200 / 1750 |
| Total height C / total depth D (mm) | 2150 / 860 | 2150 / 1150 | 2450 / 1650 |
| Net weight (kg) | 396 | 676 | 920 |
| Water inlet / outlet | DN50 | DN65 | DN100 |
| Flue connection (mm) | 160 | 200 | 250 |
| Gas connection | DN25 | DN25 | DN32 |
| Condensate drain | DN20 | DN25 | DN32 |
Data as published by OTTMEL. Specifications may change; please confirm the current datasheet with our sales team before ordering. Gas type, voltage and other market-specific requirements should be confirmed for each project.
Typical applications
- Hotels
- Factories
- Airports
- Schools
- Hospitals
- Institutional facilities with 24-hour hot water and heating demand
Related products
Gas
Low-NOx Gas Storage Water Heater – PLUS Series
- Thermal efficiency up to 98%
- NOx < 30 mg/m³
- 400 L tank
Gas
Commercial Gas Storage Water Heater – CLASSIC Series
- 22–99 kW
- 220–360 L tanks
- Pressure rating 1.1 MPa
Need this model for a project or distribution line?
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