Commercial Stainless Steel Condensing Direct-flow Boiler

The Ottmel commercial stainless steel condensing direct-flow boiler is the result of Ottmel’s many years of technological research. It includes both condensing gas wall-hung boilers and condensing gas floor-standing boilers. The standardized modular components used in the system meet the modern heating system requirements for both spatial efficiency and high performance. The modular system is composed of multiple condensing boilers. The number of modules can be increased or decreased according to the specific building requirements to meet different heating demands. Based on your domestic hot water needs, different capacities of domestic hot water storage tanks can be configured. The intelligent control system provides a comfortable and stable hot water supply.

The Ottmel commercial stainless steel condensing direct-flow boiler offers high comfort, high scalability, and high energy efficiency. Its compact wall-mounted design significantly reduces installation space, making it the ideal choice for rooftops, basements, and other confined areas.

Commercial condensing gas wall-mounted boiler Commercial condensing gas wall-mounted boiler Commercial condensing gas floor-standing boiler Commercial condensing gas floor-standing boiler

Product Description

Model CBF50 CBF99 CBF150 CBF200 CBF350 CBF700 CBF1050 CBF1400 CBF1750 CBF2100 CBF2450 CBF2800
Gas type Natural gas Natural gas Natural gas Natural gas Natural gas Natural gas Natural gas Natural gas Natural gas Natural gas Natural gas Natural gas
Rated heat input kW 50 99 150 200.3 344 654 970 1317 1650 1980 2333 2667
Rated heat output (50°C/30°C) kW 53 107 156.2 206.4 368 702 1030 1410 1750 2100 2450 2800
Atmospheric pressure Bar 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1 5.1
Maximum operating temperature °C 80°C
Temperature adjustment °C 30°C-80°C
Maximum load thermal efficiency(80°C/60°C) % 98.7 98.2 148.7 98.5 98.5 97.6 97.4 96.9 97.4 96.9 97.4 96.9
30% load thermal efficiency(50°C/30°C) % 105.5 105.7 105.7 105.4 105.3 105.5 105.1 105.2 105.1 105.2 105.3 105.5
Flue gas temperature(50°C/30°C) °C 55 60 62 61 64 63 64 65 64 65 65 65
CO₂ emissions % 8.9 9.2 9.3 9.3 9.4 9.3 9.5 9.7 9.5 9.7 9.3 9.5
CO emissions mg/m³ 21 25 26 26 27 27 28 29 28 29 27 27
NOx emissions mg/m³ ≤25 ≤25 ≤25 ≤25 ≤25 ≤25 ≤25 ≤25 ≤25 ≤25 ≤25 ≤25
NOx emission class 6 6 6 6 6 6 6 6 6 6 6 6
Gas consumption m³/h 5 9.9 14.8 19.5 34.6 67.7 98.2 137.1 165 198 233 266
Water pH value pH 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5
Supply water pressure kpa 2000-4000
Water capacity L 6 10 15 20 30 60 90 120 150 180 210 240
Water-side pressure drop △t = 20°C kPa 30 50 50 50 50 50 50 50 50 50 50 50
Flue back pressure Pa 60 63 63 63 63 63 63 63 63 63 63 63
Fan speed rpm 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
Power supply VAC/Hz 230/50
Maximum electrical power W 135 280 480 560 640 1280 1920 2560 3200 3840 4480 5120
Water Inlet mm DN25 DN25 DN40 DN40 DN65 DN80 DN100 DN150 DN200 DN200 DN250 DN250
Water outlet port mm DN25 DN25 DN40 DN40 DN65 DN80 DN100 DN150 DN200 DN200 DN250 DN250
Gas connection mm DN20 DN20 DN20 DN20 DN32 DN32 DN40 DN50 DN65 DN80 DN80 DN80
Condensation drain connection mm DN15 DN15 DN15 DN15 DN20 DN20 DN25 DN25 DN32 DN32 DN32 DN32
Flue outlet mm Φ60 Φ90 Φ110 Φ110 Φ200 Φ250 Φ250 Φ300 Φ300 Φ350 Φ350 Φ350
Weight Wall-mounted Kg 41 46 72 / / / / / / / / /
Floor-standing type Kg 62 67 92 120 143 305 446 645 800 1100 1300 1500
Dimensions
(W*L*H)
Wall-mounted mm 450*380*550 550*480*850 620*550*1000 / / / / / / / / /
Floor-standing type mm 500*520*1230 600*580*1230 622*580*1230 660*680*1600 950*1900*1450 1050*1900*2050 1400*2000*2050 1400*2000*2050 1400*3500*2050 1400*3500*2050 1400*4800*2050 1400*4800*2050

Core Component Overview

Stainless steel primary heat exchanger

1.Designed specifically for commercial boiler applications.

2.Premium stainless steel alloy ensures durability with superior oxidation and corrosion resistance.

3.Excellent thermal conductivity with compact size.

4.No minimum return water temperature required.

5.One-piece integrated forming with no weld seams and no stress points, providing an extended service life.

Combustion system

1.Use a fully premixed combustion system with dynamic control, providing precise matching and highly efficient, quiet operation.

2.Equipped with a low-NOx metal mesh burner to prevent flashback and detonation, with a stable flame profile.

3.Precise combustion ratio adjustment ensures low NOx and CO emissions for safe and environmentally friendly performance.

4.Specially designed low-resistance air intake structure keeps airflow stable and effectively reduces noise.

5.Multi-level combustion safety and control protection system ensures reliable, stable operation.

NOx emissions are lower than 30 mg/m³, meeting the latest global environmental protection standards.

High-efficiency, high-output condensing modular system with thermal efficiency up to 105%.

Maximum modulation ratio up to 10:1, matching varying heat demand at different times.

Uses fully premixed combustion technology with ultra-quiet operation, producing noise levels below 42 dB.

Modular combination installation makes transportation easier and reduces equipment installation space requirements.

The linkage system supports multiple installation methods including single-unit, side-by-side, and back-to-back layouts.