Heat pump technology is a cutting-edge energy solution that has gained significant attention from experts and researchers worldwide. Among its many applications, the air-source heat pump water heater stands out as one of the most advanced systems for producing hot water. This device extracts low-grade heat from the surrounding air, compresses it using electricity, and then transfers the concentrated heat to water, making it an efficient, eco-friendly, and safe alternative to traditional electric or gas water heaters. It can generate 3–5 times more thermal energy than the electrical energy it consumes, offering remarkable cost-effectiveness and sustainability. **Patent Overview** According to the Chinese State Intellectual Property Office database, numerous patents have been filed under the keyword “air source and heat pump water heater.” These include two invention patents and eight utility model patents. Some key examples are: - **Indoor Air Source Heat Pump Water Heater (CN200310121162.2)** – Beijing Grenada Ring Energy Technology Co., Ltd. - **Self-Stacking Air Source Heat Pump Water Heater (CN200410077681)** – South China University of Technology - **Intensive Type Air Source Heat Pump Water Heater (CN032533748)** – Shandong Kang Te Mu Energy Co., Ltd. - **Small Air Source Heat Pump Water Heater (CN03253397.7)** – Single Built Tin - **Multi-box Pressurized Air Source Household Heat Pump Water Heater (CN200420007580.9)** – Liu Yongqing - **Capacity Adjustable Air Source Heat Pump Water Heater (CN2004200367008)** – Shanghai Jiaotong University These patents reflect the growing interest in improving efficiency, reducing space requirements, and enhancing user comfort in air-source heat pump systems. **Product Features and Innovations** Shandong Kang Te Mu Energy Co., Ltd. introduced a 120L domestic heat pump with a thermal efficiency of 370%, integrating the host and tank for compact design. It can also provide cooling and dehumidification during summer. The system operates at 220V/50Hz, with a maximum water temperature of 55°C and a noise level of ≤54dB. Shanghai Jiaotong University’s model uses intelligent temperature control, combining clock-based and temperature-difference-based operations to optimize performance and reduce energy consumption. Meanwhile, Jiangsu Huayang New Energy improved insulation and tank design to enhance efficiency and reduce space usage. **Market Products Comparison** Several companies have developed air-source heat pump water heaters tailored for both residential and commercial use. Key models include: - **Shandong Kang Temu**: COP 3.7, 560W input, 120L tank, noise ≤54dB - **Zhongyu Air Conditioning**: ZKRS-1.5T, COP 3.57, 100–250L tank, 450×370×790mm - **Foshan Real Hot & Cold Equipment**: RBR-110Z, 375W input, 110L tank, 550×1300mm - **Ningbo Bo Lang**: WE-150T, COP 4.0, 150L tank, 850×310×610mm - **Taiwan Sai Gelan**: ANK-9K, 770W input, 65L/h output, 52dB noise These products highlight the diversity and advancement in air-source heat pump technology, with features like high COP, low noise, and smart control systems. **Conclusion** Air-source heat pump water heaters are increasingly seen as a sustainable and efficient replacement for conventional water heating systems. With continuous innovation and improvements in design, they are becoming a preferred choice for homes and businesses alike. As more manufacturers invest in this technology, we can expect even greater efficiency, affordability, and environmental benefits in the future.

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