Gas Combi Boilers for Global Brands
Professional OEM/ODM manufacturer of wall-hung gas combi boiler for overseas brands, importers, and distributors.
Condensing & non-condensing models, 16–42 kW, up to 108% efficiency.
Certified, ErP, certified.
Gas Boiler Product Range
Two technology paths — condensing for maximum efficiency, non-condensing for cost-effective reliability — covering 20 kW to 42 kW output for every cold-climate application.
How to Choose the Right Gas Boiler for Your Market?
Six questions, in order, will take you from "our climate is a bit different" to a shortlist of two or three models.
Climate Zone
How cold does it get?
Extreme cold (-30°C) needs higher output. Moderate cold (0°C to -10°C) can use standard models.
→ Tell us your lowest winter temperature and we size accordingly.
Heating Load
What is the heated area?
Rough rule: 80-100 W/m² for well-insulated homes, 120-150 W/m² for older buildings.
→ Share the floor area and insulation level — we calculate the exact kW needed.
Hot Water Demand
How many bathrooms run simultaneously?
One bathroom: 20-24 kW. Two bathrooms: 28-32 kW. Three+: 35-42 kW.
→ Match capacity in the table below.
Gas Type
Natural gas or LPG?
Each unit is factory-configured for your specified gas type and pressure. NG and LPG require different burner nozzles and valve settings.
→ We configure every unit before shipment — no field conversion needed.
Heat Efficiency
Condensing or non-condensing?
Condensing models recover latent heat from flue gases, reaching up to 108% efficiency (ErP A-rated). Non-condensing models are simpler and more affordable at 90-93%.
→ Condensing saves 15-20% on gas bills — worth the premium in cold climates.
Comfort Level
Who is using it?
Families with children and elderly benefit from precise temperature control and anti-scald protection. Smart thermostats add remote control and scheduling.
→ We offer models with OpenTherm, Wi-Fi, and multi-zone control.
Compare Models
The quick reference we send with every quote.
| Model | Power | Best For |
|---|---|---|
| GK-20 | 20 kW | Small apartments, 1-2 bedrooms |
| GK-24 | 24 kW | Standard homes, 2-3 bedrooms |
| GK-28 | 28 kW | Large homes, 3-4 bedrooms |
| GK-30 | 30 kW | Cold climates, high demand |
| GK-32 | 32 kW | Large villas, commercial |
| GK-36 | 36 kW | Large villas, commercial |
| GK-40 | 40 kW | Large villas, commercial |
How a Gas Combi Boiler Works
Five stages from thermostat call to warm radiators — fully automatic, with instant hot water on demand.
Thermostat Call
Room thermostat detects temperature drop and signals the boiler to fire. The fan pre-purges the combustion chamber.
Gas Ignition
The gas valve opens and the spark electrode ignites the pre-mixed gas-air mixture in the sealed burner.
Heat Exchange
The primary heat exchanger transfers combustion heat to the central-heating water circuit, raising it to the set flow temperature.
DHW Priority
When a hot tap opens, the flow sensor triggers the three-way valve to divert all heat to the plate heat exchanger for instant hot water.
Condensing Recovery
In condensing mode, the secondary heat exchanger recovers latent heat from flue vapour, boosting efficiency above 100% (ErP A).
Thermostat Call
Room thermostat detects temperature drop and signals the boiler to fire. The fan pre-purges the combustion chamber.
Gas Ignition
The gas valve opens and the spark electrode ignites the gas-air mixture in the sealed burner.
Heat Exchange
The primary heat exchanger transfers combustion heat to the central-heating water circuit, raising it to the set flow temperature.
DHW Priority
When a hot tap opens, the flow sensor triggers the three-way valve to divert all heat to the plate heat exchanger for instant hot water.
Condensing Recovery（if available)
In condensing mode, the secondary heat exchanger recovers latent heat from flue vapour, boosting efficiency above 100% (ErP A).
Gas Boiler Application Scenarios
Radiator Heating
Wall-hung gas boilers deliver high-temperature water (70-80°C) to traditional radiators, providing fast, responsive heating for homes of all sizes. Compatible with both single-pipe and two-pipe radiator systems.
Underfloor Heating
Condensing boilers excel with underfloor systems, operating at low return temperatures (35-45°C) to stay in condensing mode. This combination delivers the highest efficiency and the most comfortable, even heat distribution.
Gas Boiler OEM/ODM Manufacturing
Design Customization
- Appearance & panel design
- Capacity & dimension tuning
- Gas type configuration (NG/LPG)
- Brand logo & label design
Technical Customization
- Heating output per market
- Thermostat & safety device configuration
- Ignition & control method
- Cold climate adaptation
- High altitude adaptation
Packaging Customization
- Export-grade carton & foam
- Multi-language manual
- Product certification labeling
- Container-optimized packing
Development Process
- Requirement analysis & spec definition
- Engineering design & sampling
- Sample production & type testing
- Mass production & QC inspection
Gas Boiler Global Certifications
Our gas boilers are certified for major cold-climate markets worldwide.
We work with certification bodies to ensure your products meet local regulatory requirements.
We can also supply sample units and full technical drawings so that you can carry out local testing and obtain certifications in your own market.
Gas Boiler Quality Control System
Our ISO9001 certified quality management system ensures every boiler meets strict standards. From raw material inspection to final testing, we maintain 7-step quality control throughout the production process.
Supplier Management
Careful selection and annual evaluation of suppliers to ensure consistency.
Incoming Inspection
All components before entering our warehouse are inspected against specifications.
First Sample Inspection
The first product is inspected before mass production begins.
In-Process Inspection 1
100% inspection of semi-finished products.
In-Process Inspection 2
100% inspection of finished products.
Routine Inspection
Periodic checks are conducted on the production line.
Final Inspection
AQL sampling is performed based on customer requirements before shipment.
Supplier Management
Careful selection and annual evaluation of suppliers to ensure consistency.
Incoming Inspection
All components before entering our warehouse are inspected against specifications.
First Sample Inspection
The first product is inspected before mass production begins.
In-Process Inspection 1
100% inspection of semi-finished products.
In-Process Inspection 2
100% inspection of finished products.
Routine Inspection
Periodic checks are conducted on the production line.
Final Inspection
AQL sampling is performed based on customer requirements before shipment.
Gas Boiler FAQ
About ExampleHome — Gas Boiler Manufacturer
Example Home Appliance Co., Ltd. is a professional gas boiler manufacturer founded in 2011, specializing in wall-hung condensing and non-condensing combi boilers for cold-climate markets. Our gas boiler product range covers 20 kW to 40 kW output, supporting both natural gas and LPG configurations. With ISO9001 certification and international approvals including Certified, ErP, and certification. We serve clients across 30+ countries. Our factory covers 5,000 square meters with an annual production capacity of 200,000 units, providing reliable OEM/ODM services for distributors, importers, and brands worldwide.
Related Guides
Explore our comprehensive guides and resources to learn more about gas boiler selection, installation, and maintenance.
View All GuidesKnow Your Market? Send Us Your Requirements.
Destination country · Climate zone · Heating area · Number of bathrooms · Gas type · Installation type · Target volume. We will come back with two or three models, certifications, MOQ and lead time, usually within one working day.