Top 4 Recommended Small and Medium Commercial Hot Water Boilers

We’ve hand-picked four compact, eco-friendly boilers that combine whisper-quiet operation with top-tier efficiency. Ranging from 99 kW to 4.2 MW, they’re perfect for any setting—from outdoor kiosks and gymnasiums to shopping malls, train stations, hotels, schools and more.

1. Commercial Gas Hot Water Boiler V6

Max Output: 99 kW
Why It Shines:

• Condensing, Full-Premix Burner keeps NOₓ under 30 mg/m³ and boosts thermal efficiency to an impressive 104.5%.

• Heavy-Duty Steel Shell resists corrosion, rain and sun, so you can mount it outdoors worry-free.

• Generous Water Capacity plus digital temperature controls ensure rock-steady hot-water delivery.

• Hygienic Inner Tank features a food-grade coating and sacrificial magnesium anode for rust-free, long life.

• User-Friendly Interface: Color touchscreen, clear menus, modular design, auto-diagnostics and full alarm protection.

Typical Applications: Villas, studios, restaurants, gyms, small community centers and kindergartens—up to ~1 400 m² of heating coverage (excludes domestic hot water).

2. Commercial Gas Hot Water Boiler C6

Max Output: 1.4 MW
Why It Shines:

• Ultra-Compact Footprint: High-surface “wing” heat-exchangers deliver the same performance in a much smaller package—ideal for elevator access.

• Plug-and-Play Installation: Factory-tested, clearly labeled hookups, and no extra heat-exchangers needed when tying into your existing system.

• Efficiency & Emissions: 106% thermal efficiency, NOₓ < 30 mg/m³ via full-premix planar combustion.

Typical Applications: Malls, service stations, hotels, resorts, train stations—up to ~20 000 m² of heating.

3. Condensing Low-Pressure Hot Water Boiler H6

Max Output: 2.8 MW
Why It Shines:

• Horizontal, Space-Saving Design for easy fit in tight mechanical rooms.

• Automated PLC Control with online O₂ monitoring keeps combustion safe and stable, NOₓ well under 30 mg/m³.

• Deep-Condensing Stage recovers extra heat from flue gases and reduces pollutants.

• Scale-Resistant Flow: External water flow around the wing pipes prevents scaling and simplifies maintenance.

• 60% Smaller than a conventional condensing unit, thanks to optimized burner and heat‐exchanger layouts.

Typical Applications: Mid-size hotels, campuses, resorts and schools—up to ~40 000 m² of heating.

4. Hot Water Boiler D6

Max Output: 4.2 MW
Why It Shines:

• Dual Condenser + Deep Cooler unleashes maximum latent‐heat recovery, sending flue gas down to 20 °C.

• Recycled Condensate can feed back into your make-up water, cutting fresh-water and gas usage.

• Full-Premix Planar Combustion achieves ultra-low NOₓ and complete burn, paying for itself within a year.

• Modular Intelligence: Touchscreen interface, networked controls for load-sharing among multiple boilers.

• Light Install Costs: Small chamber and wing pipes shrink piping and eliminate the need for a tall chimney—PVC venting works fine.

Typical Applications: Large hospitals, universities, commercial districts, large hotels—anywhere extensive heating and hot-water service is needed.

Need Something Even Bigger?

For massive installations—airports, stadiums, major rail hubs or large resort hotels—our engineering team can configure systems up to 100 MW.

Why Choose Fangkuai Boilers?
We bring together advanced industrial boiler design, full automation and IoT-driven cloud management. Remote monitoring, big-data analytics and a 24/7 support center let you run your heating plant with maximum uptime, lowest emissions and minimal hands-on hassle.