The global heat pump water heater market continues its rapid expansion. Valued at USD 2.4 billion in 2025, the market is projected to reach USD 4.18 billion by 2034, growing at a CAGR of 7.16%. Asia Pacific dominates with a 43% share, driven by China’s Five-Year Plan promoting high-efficiency heat pumps. This growth reflects tightening energy regulations and increasing consumer demand for sustainable solutions.
For sourcing professionals, selecting the right partner requires understanding each supplier’s core strengths. Below, we profile ten leading manufacturers shaping the global market.
SST Heating Energy Co., Ltd. , founded in 2006, has grown into China’s largest manufacturer and exporter of stainless steel customized water tanks. With over 20 years of dedicated experience, the company has established a robust global distribution network, exporting to over 53 countries, with Europe, Australia, and North America as primary markets.
Core Expertise: Thermal Storage Specialization
SST’ s unique position in the heat pump ecosystem lies in its exclusive focus on thermal storage. The company’s engineering philosophy recognizes that a heat pump is only as reliable and efficient as the tank it partners with. With over 50 inventions and utility model patents, SST has developed the most mature manufacturing technology for DUPLEX stainless steel water tanks in China.
Duplex 2205 Stainless Steel Advantage
SST’ s use of Duplex 2205 stainless steel represents a significant material advancement. This material offers exceptional corrosion resistance—far superior to conventional 304 and 316L grades—particularly critical for installations in coastal areas or regions with challenging water chemistry. Imported from Sweden and made from over 90% recycled material, SST’ s Duplex 2205 stainless steel delivers superior tensile strength, allowing for optimized wall thickness without compromising structural integrity.
Manufacturing Scale and Capability
With a 30,000-square-meter factory housing three production workshops and six dedicated lines, SST manufactures a comprehensive range of products: heat pump water tanks, gas boiler tanks, buffer tanks, electric water tanks, and pressure solar water tanks. Total annual output exceeds 300,000 units.
ODM Services for Leading Brands
SST’ s manufacturing expertise extends to ODM services for well-known brands across the industry, leveraging the company’s manufacturing capabilities while allowing partners to focus on marketing and distribution.
International Compliance
SST products carry essential international certifications, ensuring compliance with regulatory requirements across major markets. The company maintains rigorous quality control processes, including 100% leakage testing and mechanical property verification.
Bosch Thermotechnology
Bosch Thermotechnology brings over a century of German engineering excellence to the heat pump market. The company’s portfolio spans boilers, air-to-water heat pumps, water heaters, tanks, and controls across residential and commercial applications. At ISH 2025, Bosch introduced the Green Tronic 7000 T, which heats water 3-4 times more efficiently than traditional electric water heaters with quiet operation below 49 dB(A), available in 190-liter and 300-liter models.
Daikin Industries
Daikin Industries leads the European air-to-water heat pump market with over 15.5% market share in 2025. The top five players—including Daikin, Carrier, Bosch Thermotechnology, Panasonic, and Mitsubishi Electric—collectively held 44% of the market in 2025. Daikin’ s integrated system design and global service network make it a preferred choice for complete heating packages.
Vaillant Group
Vaillant Group , family-owned since 1874, has become one of the world’s leading suppliers of heat pumps, serving over 60 countries with 16,000 employees. The company will launch the latest generation of its aroTHERM plus air-to-water heat pump in Germany and Austria in September 2025, featuring high efficiency, extremely quiet operation, and flexible installation options.
Stiebel Eltron
Stiebel Eltron , founded in 1924, brings a century of German engineering to the heat pump water heater market. In 2025, the SHP-O series was recognized with German Design Award Gold, iF Design Award, and Red Dot Award: Product Design for its blend of performance and elegant design. Using R290 natural refrigerant with exceptionally low GWP, the SHP-O achieves quiet operation and seamless solar PV integration through the MyStiebel App.
Mitsubishi Electric
Mitsubishi Electric has expanded its Ecodan R290 heat pump lineup with new 8.5kW, 10kW, and 12kW models joining existing 5kW and 6kW units. Using R290 natural refrigerant with GWP of just 0.02, the system supplies flow temperatures up to 75°C and operates efficiently down to -25°C, making it suitable for year-round use across the UK.
Panasonic Corporation
Panasonic Corporation remains a major global manufacturer of heat pump water heaters, with its Aquarea series known for smart integration and advanced controls. The company’s focus on R290 natural refrigerant technology and intelligent home energy management positions Panasonic as a key player in the residential segment.
Carrier Global Corporation
Carrier Global Corporation is a leading player in the European air-to-water heat pump market, ranking among the top five manufacturers. With a comprehensive global service network and broad product range, Carrier offers reliable solutions for residential and commercial applications worldwide.
A. O. Smith Corporation
A. O. Smith Corporation manufactures residential and commercial water heating solutions across North America, China, Europe, and India. The company serves diverse markets including residences, hotels, hospitals, schools, and industrial facilities. Its multi-brand portfolio includes State, Lochinvar, and Hague, enabling tailored solutions across market segments.
Rheem Manufacturing Company
Rheem Manufacturing , founded in 1925, has grown into a global water heating company with operations across North America, South America, Europe, Asia, and Australia. Rheem manufactures a comprehensive range of heat pump water heaters and storage solutions, supported by an extensive distribution network serving both residential and commercial applications.
Conclusion
The heat pump water heater market offers sophisticated solutions from globally recognized manufacturers. SST Heating Energy’s specialized expertise in Duplex 2205 stainless steel thermal storage, combined with its manufacturing scale and international certifications, positions it as a trusted partner for projects worldwide.
For optimal system performance, the storage tank must be properly matched to both the heat pump and the application’s specific demands. SST’ s engineering team provides personalized guidance to ensure your thermal storage solution delivers decades of reliable service.
Explore SST’ s product range and contact our technical team for expert assistance with your next project.