Gas
Low-NOx Condensing Gas Storage Water Heater – PRO Series
- Thermal efficiency ≥107%
- NOx < 30 mg/m³
- 30–99 kW
Gas
Commercial Stainless Steel Condensing Direct-Flow Boiler
A modular, fully premixed condensing boiler with a stainless steel primary heat exchanger. Wall-mounted units save plant-room space; floor-standing models extend the range for larger heating loads.
- Efficiency up to 107%
- NOx ≤ 25 mg/m³
- Modulation up to 10:1
- Wall-mounted & floor-standing
Key features
Stainless steel heat exchanger
Primary heat exchanger designed for commercial boilers, made of stainless steel alloy for oxidation and corrosion resistance. Compact, with no minimum return water temperature required. One-piece construction without weld seams.
Combustion
Full premix combustion with dynamic control and a low-NOx metal mesh burner that prevents flashback, with precise air-fuel ratio adjustment for low NOx and CO emissions.
Modular system
Units can be added or removed to match building load. Single, side-by-side and back-to-back installation layouts are supported.
Operation
Modulation ratio up to 10:1, noise below 42 dB, and a climate-compensation function to help reduce operating costs.
Technical specifications
Technical specifications (part 1)
| Model | CBF50 | CBF99 | CBF150 | CBF200 | CBF350 | CBF700 |
|---|---|---|---|---|---|---|
| Gas type | Natural gas | Natural gas | Natural gas | Natural gas | Natural gas | Natural gas |
| Rated heat input (kW) | 50 | 99 | 150 | 200.3 | 344 | 654 |
| Rated heat output, 50/30 °C (kW) | 53 | 107 | 156.2 | 206.4 | 368 | 702 |
| Max. operating pressure (bar) | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 |
| Max. operating temperature (°C) | 80 | 80 | 80 | 80 | 80 | 80 |
| Temperature adjustment (°C) | 30–80 | 30–80 | 30–80 | 30–80 | 30–80 | 30–80 |
| Full-load thermal efficiency, 80/60 °C (%) | 98.7 | 98.7 | 107 | 98.5 | 98.5 | 97.6 |
| 30% load thermal efficiency, 50/30 °C (%) | 105.5 | 105.7 | 105.7 | 105.4 | 105.3 | 105.5 |
| Flue gas temperature, 50/30 °C (°C) | 55 | 60 | 62 | 60 | 64 | 63 |
| NOx emissions (mg/m³) | ≤25 | ≤25 | ≤25 | ≤25 | ≤25 | ≤25 |
| NOx emission class | 6 | 6 | 6 | 6 | 6 | 6 |
| Gas consumption (m³/h) | 5 | 9.9 | 14.8 | 19.5 | 34.6 | 67.7 |
| Water capacity (L) | 6 | 10 | 15 | 20 | 30 | 60 |
| Power supply (VAC/Hz) | 230/50 | 230/50 | 230/50 | 230/50 | 230/50 | 230/50 |
| Max. electrical power (W) | 130 | 240 | 480 | 480 | 640 | 1280 |
| Water inlet / outlet | DN25 | DN25 | DN40 | DN40 | DN65 | DN80 |
| Gas connection | DN20 | DN20 | DN20 | DN20 | DN32 | DN32 |
| Flue outlet | Φ60 | Φ90 | Φ110 | Φ110 | Φ200 | Φ250 |
| Weight, wall-mounted / floor-standing (kg) | 41 / 62 | 46 / 67 | 72 / 92 | – / 120 | – / 143 | – / 305 |
| Dimensions, wall-mounted (W×L×H, mm) | 550×480×850 | 550×480×850 | 620×550×1000 | – | – | – |
| Dimensions, floor-standing (W×L×H, mm) | 700×520×1230 | 700×520×1230 | 622×580×1230 | 660×680×1600 | 950×1900×1450 | 1050×1900×2050 |
Technical specifications (part 2)
| Model | CBF1050 | CBF1400 | CBF1750 | CBF2100 | CBF2450 | CBF2800 |
|---|---|---|---|---|---|---|
| Rated heat input (kW) | 970 | 1317 | 1650 | 1980 | 2333 | 2667 |
| Rated heat output, 50/30 °C (kW) | 1030 | 1410 | 1750 | 2100 | 2450 | 2800 |
| Full-load thermal efficiency, 80/60 °C (%) | 97.4 | 96.9 | 97.4 | 96.9 | 97.4 | 96.9 |
| 30% load thermal efficiency, 50/30 °C (%) | 105.1 | 105.2 | 105.1 | 105.2 | 105.3 | 105.5 |
| NOx emissions (mg/m³) | ≤25 | ≤25 | ≤25 | ≤25 | ≤25 | ≤25 |
| Gas consumption (m³/h) | 98.2 | 137.1 | 165 | 198 | 233 | 266 |
| Water capacity (L) | 90 | 120 | 150 | 180 | 210 | 240 |
| Max. electrical power (W) | 1920 | 2560 | 3200 | 3840 | 4480 | 5120 |
| Water inlet / outlet | DN100 | DN150 | DN200 | DN200 | DN250 | DN250 |
| Gas connection | DN40 | DN50 | DN65 | DN80 | DN80 | DN80 |
| Flue outlet | Φ250 | Φ300 | Φ300 | Φ350 | Φ350 | Φ350 |
| Weight, floor-standing (kg) | 446 | 645 | 800 | 1100 | 1300 | 1500 |
| Dimensions, floor-standing (W×L×H, mm) | 1400×2000×2050 | 1400×2000×2050 | 1400×3500×2050 | 1400×3500×2050 | 1400×4800×2050 | 1400×4800×2050 |
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 (heating and hot water)
- Rooftop plant rooms
- Basements and confined plant rooms
- Commercial and institutional buildings
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
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