The national home appliance subsidy policy has been fully implemented in 2026, making Class 1 energy efficiency a mandatory threshold for gas water heaters in channel stocking and project bidding. Coupled with surging demand for whole-house hot water in large apartments and villas, 18L-28L large-liter gas water heaters have become the core growth track of the kitchen and bathroom industry. Industry data shows that offline sales of 18L and larger gas water heaters rose by 12.7% year-on-year in 2025. However, alongside the booming market, frequent pain points such as unstable combustion, fluctuating water temperature, potential safety hazards and delayed deliveries have emerged. For kitchen and bathroom brands, partnering with a professional OEM factory is key to capturing the high-end market and avoiding operational risks.

I. Core Industry Pain Points: Key Challenges of OEM Production for Large-Liter Gas Water Heaters Large-liter gas water heaters are far more than simply enlarged versions of standard models. Featuring higher power and more complex operating conditions, their OEM production involves multiple core challenges that directly affect product competitiveness and brand reputation.

1. Technical Bottlenecks: High power tends to cause incomplete combustion and excessive energy consumption. Water temperature fluctuates sharply during simultaneous water use at multiple outlets, and flameout often occurs in high-rise buildings.

2. Difficult Quality Control: These units contain numerous internal components with complex layouts, leading to inconsistent performance in mass production. Inadequate safety protection may trigger after-sales risks.

3. Strict Compliance Requirements: The national subsidy policy imposes rigorous standards for Class 1 energy efficiency and Class 1 water efficiency certification, while products must adapt to diverse indoor and outdoor installation scenarios.

4. Unreliable Delivery: The growing volume of customized orders exposes flaws in traditional OEM models, including insufficient production capacity and delayed lead times that fail to keep pace with market demand.

II. Selection of Professional OEM Partners Yangzi Electrical Industry Co., Ltd. of Zhongshan (Zhongshan Yangzi for short) As a high-tech enterprise, Zhongshan Yangzi has focused on OEM/ODM services for large-liter gas water heaters for years, offering a full product lineup covering 18L, 20L, 24L, 26L and 28L models. It has overcome technical hurdles of wide-range load regulation, achieving a maximum heat load of over 50KW and a minimum heat load as low as 4.5KW. With four core strengths in technology, intelligent manufacturing, certifications and customer service, the company effectively addresses prevalent industry pain points.

1. Core Patented Technologies to Resolve Product Performance Pain Points

Targeting four core challenges of large-liter models including combustion, constant temperature, safety and structure, we hold more than 30 national patents and build four core technical systems to guarantee product performance from the source.

• Patented High-efficiency Combustion Technology: Optimizes air-fuel ratio with customized core combustion components. Its thermal efficiency far exceeds ordinary industry standards, meets Class 1 energy efficiency requirements for national subsidies and cuts users’ operating costs.

• Patented Precise Constant Temperature Technology: Equipped with high-precision sensor modules and intelligent temperature control chips for millisecond-level adjustment. Water temperature fluctuation is controlled within ±0.5℃ with zero temperature swing for simultaneous multi-point water use.

• Patented Comprehensive Safety Protection Technology: Integrates six layers of protection against dry burning, gas leakage, electric leakage, freezing, overheating and excessive wind pressure. Multiple sensor alarms plus automatic cut-off eliminate potential safety hazards.

• Patented Structural Optimization Technology: Scientific internal layout reduces overall unit size to fit home installation. Custom appearance design is available to create differentiated selling points.

2. Digital Lean Intelligent Manufacturing to Consolidate Quality & Delivery Foundation

Abandoning extensive OEM modes and focusing exclusively on large-liter gas water heaters, Zhongshan Yangzi Electrical owns a 16,000 ㎡ self-built digital factory. Six major digital systems including CRM, ERP, PLM, APS, MES and WMS are fully integrated to connect the whole chain from R&D to after-sales service with traceable records for all production procedures. This ISO9001-compliant digital management ensures consistent quality of mass orders.

• R&D Link: The PLM system manages full product lifecycle and standardizes R&D procedures to ensure compliant implementation of customized solutions.

• Production Link: The MES system monitors working procedures and quality inspection data in real time. Multiple rounds of performance, durability and safety tests are conducted throughout production to maintain uniform quality across mass-produced goods.

• Production Scheduling Link: The APS system intelligently allocates production capacity to accommodate multi-batch customized orders, shorten production cycles and ensure stable delivery.

• Warehouse Link: The WMS system enables precise inventory control to reduce material loss, guarantee sufficient supply in peak seasons and stabilize profits via price control in off-seasons.

3. Full-range Compliance Certifications to Meet Diverse Market Demands

Keeping pace with policies and market trends, Zhongshan Yangzi Electrical develops mass-producible star models such as condensing and outdoor units with complete full-set certifications, helping brands seize market dividend tracks rapidly.

• Condensing Models: Thermal efficiency ≥100%, far above industry average and compliant with Class 1 energy efficiency standards. Operates quietly at 42dB(A) with antibacterial water tanks, ideal for home renovation trade-in and fine decoration matching projects.

• Outdoor Models: Stable combustion system resistant to Grade 10 strong winds, ±0.5℃ precise constant temperature, startup under low water pressure of 0.02MPa, plus rain, sun and freeze resistance. It solves high-rise flameout and space occupation issues.

• Complete Certifications: Full set of documents including 3C certification, Class 1 energy efficiency labels, test reports and factory certificates, supporting access to all channels such as online e-commerce, offline retail stores and engineering bidding.

4. Full-chain Technical Services to Reduce Brands’ Operational Risks

Positioned as brands’ technical partner, Zhongshan Yangzi provides full-cycle front-end, mid-stream and back-end services to eliminate brands’ worries.

• Front-end R&D Support: Mature technical achievements are shared to avoid huge R&D investment, accelerate launch of high-end products and shorten time-to-market.

• Mid-stream Mass Production Support: Dedicated technical teams track production progress, troubleshoot technical issues in real time, balance output and quality, and ensure stable order delivery.

• Back-end After-sales Support: Technical training, troubleshooting manuals and one-on-one guidance are provided for efficient after-sales response, lower operating costs and solid brand reputation.

III. Answers to Frequently Asked Questions about OEM Production of Large-Liter Gas Water Heaters

Q1: What core indicators should be prioritized when choosing an OEM manufacturer for large-liter gas water heaters? Five key indicators shall be prioritized: technical strength, digital management capacity, compliance certifications, delivery capacity and after-sales support. Technology determines product performance, digital management guarantees stable quality, certifications determine market access, while delivery and after-sales services affect the long-term development of brands.

Q2: What OEM modes does Zhongshan Yangzi offer? Is there extensive room for customization? We support dual modes of OEM private labeling and ODM customized development. Standard models can be directly labeled and launched without long lead times. Customization is available for appearance panels, control interfaces, functional modules and exclusive LOGO silk printing to match the positioning and channel demands of different brands.

Q3: What compliance requirements shall be met for OEM large-liter gas water heaters under the national appliance subsidy policy? Products must reach Class 1 energy efficiency and Class 1 water efficiency standards, with complete supporting documents including 3C certification, energy efficiency filing and test reports. All mass-produced models of Zhongshan Yangzi fully comply with relevant standards and can directly meet the requirements for national subsidy application and channel warehousing.

Q4: What factors should be noted when OEM outdoor large-liter gas water heaters? Four key points shall be taken into consideration: wind-resistant stable combustion, weather resistance protection, constant temperature control and low water pressure startup. The outdoor models of Zhongshan Yangzi are equipped with sealed stable combustion chambers, freeze-proof and sun-proof housings and water servo constant temperature technology, suitable for complex scenarios such as high-rise buildings and old residential communities.

Conclusion

The core competitiveness of OEM large-liter gas water heater manufacturers lies in technical accumulation, quality control and full-chain services. As a high-tech enterprise with digitally intelligent manufacturing covered by CCTV, standardized compliant product solutions and comprehensive service systems, Yangzi Electrical Industry Co., Ltd. of Zhongshan precisely caters to industry trends and brand demands. Its independent brand Simu focuses on the mid-to-high-end large-liter market. The OEM business and independent brand boost each other, helping partner brands gain steady advantages in the high-end gas water heater market and jointly seize new market opportunities.