20kw Combi Gas Boiler for Instant Hot Water Supply

• Customization: Available
• After-sales Service: 1% Spare Part
• Warranty: 3
• Model NO.: HBG-K15B
• Brand: Doublemax
• Installation: Wall-Mounted
• Power (W): 32kw
• Exhaust Way: Forced Exhaust Flue
• Gas Heater Type: Gas Heating
• Ignition: Electronic Pulse Ignited
• Heating Area: up to 249 FT²
• Material: Metal
• Overheat Protection: Yes
• Power Source: Gas
• Use: Bathroom, Bedroom, Living Room
• Energy Efficiency Rating: Class a
• Heat Efficiency: Over 90%
• Display Type: LED
• APP-Controlled: No
• Voltage (V): 110-220V
• Transport Package: 760X480X320 84
• Specification: 660X410X253
• Trademark: oublemax
• Origin: China
• HS Code: 841810
• Production Capacity: 200000/Year
• Package Size: 760.00cm * 480.00cm * 320.00cm
• Package Gross Weight: 30.000kg

Product Description

20KW Combi Gas Boiler for Instant Hot Water Supply

Our wall-hung gas boiler offers heating & hot water. Durable, efficient, user-friendly, ideal for apartments, villas, and homes. Non-condensing, atmospheric or fan-assisted combustion, fits markets with stable gas.

Specification

Product Advantages:

Product Advantages:
Dual Function: Central heat + hot water
Compact Design: Easy install, space-saving
Intelligent Control: Constant temp, LED display
Safe Operation: Multiple protections
Flexible Customization: Panel, logo, color, language
Suitable for various residential uses

Application:
Residential homes
Apartments
Hotels
Villas

Certifications:
CE / ISO9001 / ERP (if applicable)
Gas approval for specific markets

Key Configurations

1. High Energy Efficiency

2. Constant Temperature Control

3. Compact & Space-Saving Design

4. Reliable Safety Protection

5. Quiet Operation

6. Fast Heating & Stable Output

7. User-Friendly Interface

8. Compatible with Different Gas Types

right elevation

left elevation

front elevation

Technical Specifications

(Custom configurations available upon request.)

Parameter	Description
Rated Heat Input	18 / 20 / 24 / 28 / 32 kW (optional)
Rated Heat Output	Same as input (non-condensing type)
Gas Type	0.8–1.2
Heating Temperature Range	6.2
Domestic Hot Water Output	9.5
Hot Water Temperature Range	35°C – 60°C (adjustable)
Efficiency	≥ 88%
Ignition System	Automatic electric ignition
Display	LED Digital Display
Safety Functions	Overheating protection, Anti-dry burn, Flame failure protection, Overpressure protection, Anti-freeze
Noise Level	≤ 45 dB
Power Supply	AC 220V / 50Hz
Exhaust Type	Forced Exhaust / Balanced Flue
Installation	Wall-mounted
Dimensions	780*480*320
Net Weight	28 – 34 kg (depending on model)
Housing Material	White powder-coated steel panel (optional stainless steel)

Packaging & Delivery

Packaging Details
Boilers packed with export-grade protection for safe delivery over long distances.
Each unit boxed in high-strength corrugated carton, reinforced EPE foam, anti-vibration to prevent impact, compression, and moisture.

Standard Package Includes
Wall-hung gas boiler unit
Mounting bracket & installation kit
User manual (English)
Warranty card

Packaging Features
Export-grade 5-layer corrugated carton
High-density foam for corner/side protection
Anti-drop, anti-vibration, moisture-resistant features
Clear printing of model labels, barcodes, handling marks
OEM logo/design packaging available upon request

Delivery Details
Lead Time: 25–35 days after deposit & artwork confirmation
OEM/ODM: Supported
Loading Port: Shenzhen/Nansha (or as requested)
Supply Ability: 5000 units/month (adjustable)

	20KW	24KW	28KW	32KW	40KW
NW (kg)	26	27	34	35	39
GW (kg)	29	30	37	38	42
Product size (mm)	660X410X253	660X410X253	740*410*305	740*410*305	740*460*330
Packing size (mm)	760X480X320	760X480X320	840*485*398	840*485*398	840*525*430

After Sales Service

1. Warranty Policy
1-year warranty from shipment or 18 months from production, whichever first.
Free parts for defects from manufacturing/material issues within warranty.
Excludes damages from incorrect installation, misuse, or external factors.

2. Technical Support
24-hour online support via email, video call, or instant messaging.
Installation manuals, diagrams, and troubleshooting guides included.
Remote training for distributors or technicians available on request.

3. Spare Parts Supply
Spare parts available for at least 5 years post-shipment.
Common parts in stock for quick replacement.
Spare parts catalog available for ordering and maintenance.

4. OEM / ODM Support
Customization: logo, panel design, packaging, manual localization.
Technical drawings, reports, and documentation for partners.

5. Customer Feedback & Service Response
Inquiries and complaints answered within 24 hours.
Replacement or compensation for confirmed quality issues per warranty.
Regular feedback follow-up for satisfaction and reliability.

6. Installation & Maintenance Assistance (Optional)
On-site installation training or video demo for bulk orders.
Manual includes maintenance tips for safe, long-term boiler operation.

Company Profile

Zhongshan doublemax  Co., Ltd.

Equipped with advanced production lines & R&D center, we strictly control quality.

Our products are sold globally, especially in Europe, SE Asia, Middle East, S America.
Over 50% of our products are CE, CB, ETL certified. Received ISO9001 and TUV.
For 21 years, we’ve earned honors and patents, praised by customers worldwide.

With customer trust, government support, and teamwork, we create smart, green products.

Why Choose Us?

Other Products

OEM/ODM capabilities
Competitive pricing & bulk discounts
Fast shipping & customs clearance support

Gas water heater
Gas stove
Range hood
Gas boiler
Microwave oven

FAQ

1. What is your main product line is made?

We produce built-in stoves, gas water heaters, gas boilers, range hoods, and microwaves.

2.Your factory or trading company?

We are a factory offering OEM & ODM services.

3.What is your main market?

Our main markets: Middle East, South America, Europe, Russia, Africa, and more.

4.You have the ability to do independent research and development?

Our 10-person engineering team manages R&D and product launches monthly.

5.If I have a question I would like advice on how to contact you?

Contact us via SNS platforms or email for inquiries and advice.

6. What services do you provide?

Let us know if you're a factory, wholesaler, purchaser, dealer, consumer, or in engineering or design. We'll provide detailed explanations and answer questions. For service dissatisfaction, contact us via email or phone. Thank you.