What is the warranty period and after-sales guarantee?

The main model is guaranteed for 3-5 years, while core components like the heat exchanger and water pump are guaranteed for 8-10 years. Official authorized after-sales outlets are available nationwide.

High-Efficiency 20kw Natural Gas Combi Boiler for Homes

Name: High-Efficiency 20kw Natural Gas Combi Boiler for Homes
Brand: Dezhou Watson Electric Co., Ltd.
SKU: 2129180862

Shandong, ChinaDezhou Watson Electric Co., Ltd.

US$150.00

100 Pieces

Sample price:US$150.00/piece.Request sample

Product profile

Customization

Available

Function

Hot Water Boiler

Fuel

Gas-Fired

Model NO.

L1PB20-WS/A1

Installation

Packaged Boiler

Structure

Fire Tube

Media

Hot Water

Water Circulation

Forced Circulation

Drum Placement

Horizontal Boiler

Pressure

Low Pressure

Manufacturing Level

Burning Style

Chamber Combustion Boiler

Usage

Home

Brand

50-100m2

Boiler Function

Heating and Domestic Hot Water

Fuel Type

Natural Gas

Rated Heat Input

20kw

Thermal Efficiency

Over 90 Percent

Heating Temperature

30-80 Degree C

Hot Water Temperature

30-60 Degree C

Power Supply

220V 50Hz

Protection Class

Ipx4

Expansion Tank

Flue Size

60/100mm

Heating Pressure Max

0.3MPa

Rated Voltage

AC 220V 50Hz

Minimum Load Power

100W

Transport Package

Carton Packing

Specification

740x410x305mm

Trademark

DISIDUN

Origin

Shandong, Dezhou, China

HS Code

8403101000

Key features

Durable Construction: Uses copper heat exchanger and galvanized steel shell for anti-rust and corrosion resistance.

Smart Control: Intelligent electronic control with digital display and automatic mode switching.

Safe Exhaust Design: Closed combustion and forced exhaust system ensures safe indoor use and stable operation.

Verified Certifications: Passed CCC, ISO9001, CE, and RoHS certifications for quality and safety assurance.

Customization Options: Supports customization from samples, designs, and flexible minor modifications.

Company profile

R&D CapabilitiesHigh Repeat Buyers ChoiceManagement CertificationProduct Certification

Dezhou Watson Electric Co., Ltd.

Shandong, China

Business Type: Manufacturer/Factory CertifiedR&D Capacity: ODM Service Available & OEM Service AvailableAverage Response Time: ≤0.91h

AI-Powered supplier vetting

SummaryThe supplier is identified as a professional technical supplier for gas and household appliances, with 3D software design, OEM, ODM, and broad customization capabilities. It reports multiple product, quality, environmental, safety, and service certifications, supported by testing and production equipment. Production-related evidence includes an assembly line, automated machinery, and specialized boiler testers, while the stated off-season lead time is within 15 workdays. Quality controls include assurance and raw-material traceability, but several procedures lack documented records. Financial credibility cannot be confirmed because the provided financial figures are zero. Innovation evidence is mixed: the supplier has patents and one R&D engineer but reported no new products in the past year and no available SDK. Customer evidence includes OEM service for well-known brands and an 80%–100% repeat-buyer preference, but no Fortune 500 cooperation.

Supplier typeThe supplier explicitly identifies as a professional technical supplier and operates in gas appliances, household appliances, and related installation, spare-parts, and non-electric appliance businesses. It also provides OEM and ODM services, indicating a manufacturer with technical and production functions.

CertificationsThe supplier reports National Energy Conservation, National Environmental Protection, CCC, five-star product, after-sales service, gas appliance installation and repair, and multiple patent-related credentials. It also lists ISO9001:2015, ISO45001:2018, and ISO14001 management certifications, providing explicit evidence of broad compliance and management-system coverage.

After-Sales capabilityEvidence includes Star-Rated After-Sales Service Certification, gas appliance installation and repair qualification, and the ability to participate in offline exhibitions. However, complaint-handling procedures have no written records, and the service corrective-action mechanism and supplier-service procedures also lack records, limiting evidence of consistently documented execution.

Production capacityThe supplier reports an assembly line, automatic laminating and palletizing machines, laser marking equipment, online and safety testers, and dedicated household and commercial heating hot-water boiler testers. Its stated off-season lead time is within 15 workdays, while its business scope includes production of gas and household appliances, directly supporting manufacturing capability.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, minor customization, and flexible customization. Its 3D design service, ODM capability, and OEM service further support the ability to develop or adapt products for customer requirements.

Client casesThe supplier states that it provides OEM services for well-known brands and reports an 80%–100% repeat-buyer preference. It has no reported cooperation with Fortune 500 companies, and the only specifically named external activity is participation in the Uzbekistan Industrial Products Exhibition 2025; therefore, customer references are positive but limited in detail.

Product Q&A

Q:How to choose the power of the wall-mounted boiler to match my home layout?

For ordinary residential buildings of 80-150 square meters, choose 24KW. Choose 28KW or above for 150m2 or larger units. For homes in the south without insulation or with multiple bathrooms, increase power by 20% to 30%.

Q:Does online purchase include installation services and auxiliary material costs?

Most models include free basic installation but exclude special fees like high-altitude work or wall drilling. Auxiliary materials like pipes and filters are purchased separately, with total costs usually around 1,000 yuan.

Q:Can the boiler provide both heating and hot water at the same time?

No, it cannot run simultaneously. The hot water function takes priority. The machine automatically switches between heating and hot water modes based on faucet usage, suspending heating during hot water use.

Q:Is there a significant difference between first-class energy efficiency and ordinary boilers?

First-class efficiency boilers are often condensing types with thermal efficiency over 107%, saving 15-20% on gas fees compared to ordinary non-condensing boilers, making them cost-effective for long-term use.

Q:Can I install this boiler in an old house without pre-installed heating pipes?

Yes. For old or renovated houses, you can choose an open-air radiator system that does not damage walls or decoration. A technician can be booked to measure and design the installation plan after ordering.