Industrial Gas Steam Boiler Manufacturers Top 10

1. Fangkuai Boiler Co., Ltd.

Background & Scale
Founded in 1998 and headquartered in Anyang, Henan, China, Fangkuai operates two manufacturing plants with a combined 120,000 m² production area and a 6,000 m² R&D experimental center. To date, the company holds over 107 national patents in combustion, controls, and materials.

Exports: 80+ countries, annual steam output >20,000 tons
R&D Strength: Academician Chen Xuedong Workstation; All-Operating-Conditions Boiler Research and Development Laboratory; remote monitoring “cloud service” system; FPB full-premixed combustion
Representative Product
– WNS Series Gas(oil)-Fired Horizontal Wet-Back Boiler (0.5–100 t/h, ≤3.8 MPa). This three-pass design delivers >96% thermal efficiency and is widely used across chemical, food, and textile industries.

2. Miura Co., Ltd.

Background & Innovation
Miura’s modular water-tube boiler systems produce full-pressure steam from a cold start in under five minutes, enabling true on-demand generation.
R&D & Emissions
Their LX series achieves NOₓ as low as 5 ppm at 3% O₂ and 85%+ fuel-to-steam efficiency, backed by integrated IoT monitoring and ASME-stamped U.S. manufacturing.
Representative Product
– LX Gas-Fired Steam Boilers (e.g., LX-300 SG): Compact, modular once-through systems with rapid startup and ultra-low emissions.

3. Fulton Companies

Heritage & Design
Since pioneering the original tubeless vertical boiler in 1949, Fulton has set the industry standard for compact, refractory-free steam vessels.
Global Footprint
Fulton ships VSRT units (up to 250 BHP) worldwide and maintains sales and service offices across five continents.
Representative Product
– VSRT™ Vertical Spiral Rib Tubeless Steam Boiler: Fully wetted vessel delivering high-quality steam with minimal thermal loss and rapid response.

4. Clayton Industries

Technology & Efficiency
Clayton’s forced-flow monotube generators achieve 84–85% efficiency without economizers, thanks to a counterflow heat exchanger and mechanical steam separation.
Service & Support
With manufacturing sites in the U.S., Europe, and Asia, Clayton offers turnkey skids, feedwater systems, and emergency containerized solutions.
Representative Product
– SigmaFire Series Steam Generators (500 kW–2 MW; 785–3,136 kg/h): Compact indirect steam units for process heating and waste-heat recovery.

5. AERCO International, Inc.

Legacy & Markets
Founded by Henry Angelery in 1949, AERCO leads in commercial condensing boiler and water-heater design for medical, hospitality, and foodservice sectors.
Product Lines
Their AM, Benchmark, CFR, MFC, and Sequoia series feature fully modulating, energy-saving technologies with factory training and support.
Representative Product
– Benchmark® S Series Condensing Boiler (2500 & 3000 MBH): Robust stainless-steel fire-tube unit, 99% efficiency, 20 ppm NOₓ, 15:1 turndown.

6. Sigma Thermal, Inc.

Expertise & Certification
ISO 9001:2015 certified, Sigma Thermal specializes in indirect steam generation and thermal-fluid heating for process industries.
Core Offering
They offer high-pressure steam generators, indirect hot-oil steam exchangers, and waste-heat recovery systems tailored to food, chemical, and petrochemical plants.
Representative Product
– NUK® High-Pressure Steam Generator: Hermetically sealed unit for oil deodorization and non-toxic process heat up to high pressures.

7. Thermax Limited

Profile & Reach
Headquartered in Pune, India, Thermax is an engineering conglomerate founded in 1966 (public since 1995) with global projects in clean energy and water treatment.
Service Arm
Their Utility Consultancy designs complete steam, condensate, and waste-heat systems across pharmaceuticals, textiles, and power sectors.
Representative Product
– Steamatic Coil-Type Steam Boiler (50–850 kg/h): Instant, compact coil boiler for heavy oil, gas, and dual-fuel operations.

8. Viessmann Group

Heritage & Scale
Founded in 1917 and headquartered in Allendorf, Germany, Viessmann employs ~12,000 across 22 production sites in 12 countries, with sales presence in 74 nations.
Sustainability
As a family-owned innovator, Viessmann integrates H₂-ready combustion and solar-thermal technology in its product portfolio.
Representative Product
– Vitomax HS High Pressure Steam Boiler (0.5–31.5 t/h, 6–25 bar): >95.5% efficiency, H₂-ready, integral steam drier for high steam quality.

9. Hurst Boiler & Welding Co., Inc.

Founding & Reach
Since 1967, Hurst in Coolidge, GA has engineered gas, oil, biomass, and hybrid steam boilers with global sales representatives in 50+ countries.
Turnkey Solutions
They provide skid-packaged systems, economizers, controls, and full boiler-room peripherals for seamless installation.
Representative Product
– Performance Series 500 Four-Pass Packaged Scotch Marine Boiler: High-efficiency, easy-access design with no refractory rear door for up to 500 BHP.

10. Bosch Thermotechnology

Production & Sustainability
Bosch Thermotechnology Ltd manufactures ~1,500 large-scale industrial boilers annually at sites in Germany and Austria, integrating Industry 4.0 ﹠ low-NOₓ features.
Future Fuel Options
Their systems support green hydrogen, biofuels, and hybrid operation for carbon-neutral pathways.
Representative Product
– ELSB Electric Steam Boiler (0.35t–7.5t/h, ≤24 bar): 100% electric, no emissions, rapid response with high-quality steam generation.

This ranking balances scale, innovation, emissions performance, and global service. Let me know if you’d like deeper case studies, regional performance data, or comparisons of installation costs!