What is the after-sales guarantee and warranty period?

The product adheres to the national 'three guarantees' policy. Main models are guaranteed for 3-5 years, and core components like heat exchangers and water pumps for 8-10 years.

Can the wall-mounted boiler heat normally after the water supply is cut off?

Heating can continue as it is a closed water circulation system. However, hot water cannot be used without tap water supply.

How to prevent the wall-mounted boiler from freezing when no one is at home in winter?

For short trips, turn on anti-freezing mode and keep power/gas on. For long absences, turn off water, electricity, and gas, and drain the water to prevent freezing damage.

Does the wall-mounted boiler consume a lot of electricity?

No. Main power-consuming components (fan and pump) have a rated power of only 100-200W and run synchronously with the heating system, similar to a household refrigerator.

28kw Wall Mounted Gas Combi Boiler Home Central Heating

Name: 28kw Wall Mounted Gas Combi Boiler Home Central Heating
Brand: Dezhou Watson Electric Co., Ltd.
SKU: 2147562412

Shandong, ChinaDezhou Watson Electric Co., Ltd.

US$130.00

100 Pieces

Sample price:US$150.00/piece.Request sample

Product profile

Customization

Available

Water Storage Mode

Instant Heating Type

Capacity

30L

Model NO.

L1PB28-WSH1

Installation

Vertical Type

Pressure

Pressurized

Bearing or Not

Closed

Control Mode

Mechanical

Interior Material

Stainless Steel

Housing Material

Stainless Steel

Usage

Bathroom, Kitchen

Certification

ISO9001, CCC

Gas Type

Natural Gas

Type

Forced Exhaust

Energy Efficiency Grade

One

Function

Water Boiler, Hot Water Boiler

Fuel

Gas-Fired

Structure

Water Tube

Media

Organic Heat Transfer Material

Water Circulation

Forced Circulation

Drum Placement

Vertical Boiler

Manufacturing Level

Burning Style

Chamber Combustion Boiler

Control Method

Smart Control

Size

Medium

Minimum Power

100W

Transport Package

Carton Packing

Specification

760*440*8mm

Trademark

DISIDUN

Origin

Zhongguo Dezhou

HS Code

8403101000

Key features

High Thermal Efficiency: Level 2 energy efficiency with up to 93.4% thermal efficiency, reducing gas consumption.

Dual Working Modes: Supports independent central heating and instant hot water supply for bathroom and kitchen.

Full Safety Protection: Built-in anti-freezing, anti-overheating, flameout, overpressure, and flue blockage protection.

Compact Wall-Mounted Design: Small size and wall-mounted installation save indoor floor space and match various decor styles.

Durable Structure: Adopts copper heat exchanger and galvanized steel shell, anti-rust and corrosion resistant.

Intelligent Control: Digital display and precise temperature adjustment with automatic mode switching.

Certified Quality: Passed CCC, ISO9001, CE, RoHS certifications and professional testing.

Wide Application: Suitable for ordinary houses, apartments and villas for heating and hot water demands.

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: ≤1.64h

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 and wall drilling. Auxiliary materials cost around 1,000 yuan. Consult customer service for details.

Q:Can a dual-purpose wall-mounted boiler provide both heating and hot water at the same time?

It cannot run at the same time. The hot water function starts first. The machine automatically switches between modes based on faucet usage, suspending heating temporarily during hot water use.

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

First-class efficiency condensing boilers reach over 107% thermal efficiency, saving 15-20% gas compared to ordinary boilers. It is cost-effective for long-term use, especially in large houses.

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

Yes. You can choose an open-air radiator system which does not damage walls or decoration. Book a master to measure and design the installation plan after ordering.