Condensing Atmospheric Hot Water Boiler H7

Fangkuai H7 Series: Compact Condensing Hot Water Boiler with Energy-Saving Performance​​

The Fangkuai H7 condensing hot water boiler utilizes single-pass flue gas cycling – a breakthrough design developed by Fangkuai engineers in 2018. This innovation achieves space-efficient dimensions without compromising thermal efficiency (tested at 97% under EN 303) or environmental compliance (15 mg/m³ NOx per EN 676). By simplifying flue gas processing, operators benefit from 32% lower fuel consumption and reduced electrical load compared to traditional multi-pass systems.

Core Technologies Driving the H7 Series​​

​​1. Single-Pass Flue Gas Cycling​

Through 18 years of iterative development, Fangkuai’s patented single-pass system eliminates redundant flue recirculation hardware. The vertical gas path configuration cuts boiler height by 40% (e.g., 3m height for 4200kW models) while maintaining stable 85°C water output. Field data shows 22% faster heat-up cycles versus conventional designs.

​​2. Precision Combustion Control​

​Our adaptive combustion system stabilizes furnace pressure during operation while automatically adapting combustion parameters to seasonal temperature changes. This dual functionality achieves two critical outcomes:

• Consistent NOx emissions control at 15-30 mg/m³ range
• Year-round efficiency preservation (±2% variation)
  The heat recovery mechanism further captures 12% additional thermal energy from combustion chambers.

​​3. Winged Heat Exchange Modules​

​Corrosion-resistant silicon-aluminum fins expand heat transfer surface area by 5.8x compared to smooth tubes. Laboratory aging tests confirm these winged modules retain 91% conductivity after 15,000 operating hours, even under partial-load conditions causing 60°C condensate formation.

​​Operational Advantages​​

Space Optimization
• 4200kW model footprint: 1.8m³ (saves 35% floor space vs. comparable units)
• Pre-assembled skid design reduces installation labor by 60%

Enhanced Durability
• Full wet-back construction prevents tube failures (0 incidents in 5-year tracking)
• Steel-aluminum composite condensers withstand pH2.5 acidic condensate

Noise & Vibration Control
• 62 dB(A) operational noise at 1m distance (meets GB/T 2888 standards)
• Dampened vibration transmission through optimized gas flow paths

​​Industry Applications​​
• Automotive plants requiring 24/7 process heating
• District heating systems for residential complexes (tested in -25°C environments)
• Hotel chains needing 80℃ domestic hot water supply

Technical Q&A​​
Q: How does single-pass design impact maintenance?
A: Simplified gas routing enables full internal access through single inspection port, cutting maintenance downtime by 45%.

Q: What’s the lifespan of winged tubes?
A: Accelerated corrosion tests equivalent to 10-year use show ≤0.03mm/year erosion rate when using standard water treatment.