Wanhe is the largest gas appliance manufacturer in China, ranking first in the market share of gas water heaters, and also has a stable and good performance in the field of electric water heaters. However, in terms of air energy water heaters, Wanhe started late, and it was not until 2016 that Wanhe cooperated with Bosch to establish a joint venture company, and Wanhe brand air energy water heaters were gradually getting better.
 
In terms of technology, Wanhe draws on the strengths of others, backed by the mature heat pump technology of Bosch Group, and the process selected for each part is currently the most mainstream and practical. The surface of the outer coil of the heat exchanger adopts a unique D-shaped tube, which increases the heating area and improves the heat transfer efficiency. The structure of the separation of water and electricity can avoid corrosion of the coil and enhance the safety performance. In addition, the enamel liner is made of enamel powder imported from the American FERRO company, which is stable and can cope with different water quality in various places, and has a service life of up to 15 years.
 
Most of Wanhe products are split design, consisting of two parts: heat pump host and water tank. The heat pump uses Panasonic 2P17S225ANQ compressor, and the energy efficiency level is mostly 2 and 3. The compressor refrigerant is still using the less environmentally friendly R22 refrigerant, which is also less thermally efficient. In addition, the noise level of this compressor is slightly louder, at 53 decibels, and the main unit is not suitable for installation too close to the bedroom living room.
 
Wanhe has a clear product line, Hemu is an entry-level model, Herui is a mainstream model with a higher energy efficiency level, Heya is a large-capacity model, Hequan is a model with electric auxiliary heating function, and Heyun is an integral model. Because the maximum water temperature of Hemu, Herui and Heya is only 55°C, this water temperature is very suitable for the survival and reproduction of highly pathogenic Legionella common in water bodies, and it is not recommended to buy such products for health reasons.
 
The Hequan series at the same price can be heated to 70 °C by electric auxiliary heat, which is a more ideal purchase choice, and the series has two capacity options of 150 liters and 200 liters, and the price is about 5900 yuan and 6300 yuan respectively. The 150 liter capacity is suitable for a small family of 2~4 people, and the 200 liters are more suitable for a family of 4~5 people. The product adopts a high-density insulation layer of 50 mm F245fa material, which is second only to Finney and Midea in thickness, and has better thermal insulation performance, which is higher than most brands in the industry.
 
In the process of purchasing air energy water heaters, it is common to see the promotion of blue hydrophilic membrane fin evaporators. However, this layer of blue film is essentially a material to ensure the corrosion resistance of the external machine, which is a basic technology that must be possessed, and has no gold content. The energy efficiency level of Wanhe heat pump water heater products is average, and the heating performance and low temperature performance are the basic level of the industry, but the price is reasonable, and there is a three-year warranty service.