The development of domestic heat pump

A household heat pump is a device that utilizes low-temperature heat energy in the environment to drive a refrigerant cycle through electricity to increase the temperature and supply building heating or domestic hot water. It has the advantages of energy saving, environmental protection and safety.

The development history of domestic heat pumps can be traced back to the mid-19th century, when the French scientist Carnot proposed the Carnot cycle theory, which became the origin of heat pump technology. In 1850, the British scientist Kelvin proposed the idea of a heat pump using the reverse Carnot cycle for heating. But it was not until the middle of the 20th century that people began to pay attention to and promote this technology due to the impact of two world wars and two oil crises.

At present, countries all over the world have different degrees of development and application in the field of household heat pumps. Japan is the first country to popularize household heat pump air conditioners and water heaters, and its product performance and efficiency have reached a relatively high level. European countries focus on large-scale heating systems using ground or water sources as heat sources, and have formulated relevant policies and standards to promote the realization of low-carbon buildings. The United States mainly adopts the centralized air-conditioning system with air source as the heat source, and has carried out technical improvements under low-temperature operating conditions.

my country began to introduce and develop domestic heat pump technology in the 1980s, and has achieved rapid development in recent years. At present, my country has formed a diversified market pattern with air sources as the main source, ground source and water source as the supplementary sources, and has continuously improved in product performance, energy saving effect, and operational reliability. With the continuous strengthening of my country’s energy-saving emission reduction and carbon neutral goals, as well as the introduction of related policies and subsidies, it is expected that my country’s domestic heat pump market will have greater room for growth in the future.

How to choose the right home heat pump product?

The following aspects need to be considered:

Your heating or cooling needs, including room size, orientation, insulation, climate conditions, etc., to determine the capacity and performance of the heat pump.

Your heating or cooling methods, including floor heating, radiators, fan coils, etc., to determine the heat pump’s outlet water temperature and circulating water volume.

Depending on your budget and energy consumption requirements, different types and brands of heat pumps vary in price and efficiency, generally speaking, heat pumps use less energy but are more expensive; condensing or direct exhaust require more energy , but at a lower price.

Depending on your installation space and environmental conditions, different types of heat pumps have different requirements for installation location and ventilation conditions. Generally speaking, the direct exhaust type needs to have good exhaust channels; the condensing type needs to have drainage facilities; the heat pump type needs to avoid direct sunlight and noise disturbance.

You can refer to the following steps to choose the right home heat pump product:

Step 1: Calculate your heating or cooling load. You can calculate the circulating air volume based on factors such as room area, floor height, and gas circulation times; calculate the required cooling or heating capacity based on the unit area load and room area. You can also refer to some professional software or websites for load calculation.

Step Two: Choose your heating or cooling end. Determine the fan coil unit model according to the circulating air volume and cooling capacity or heating capacity; determine the floor heating coil tube spacing according to the water supply temperature, floor material and other factors; determine the heat sink model according to the inlet and outlet water temperature, indoor design temperature and other factors.

The third step: choose your heat pump host. Determine the number and capacity of hosts based on factors such as total load and simultaneous utilization; select the type of host (inline, condensing, or heat pump) based on factors such as budget and energy consumption requirements; select the location of the host based on factors such as installation space and environmental conditions ( roof, balcony or ground).

How do household heat pump products need maintenance?

Before turning on the machine every day, check whether the power cord is safe and firm, and whether the voltage is stable.

Clean the filter screen and dust box of the equipment every day to ensure that the equipment is well ventilated.

Carry out a major cleaning of the equipment once a month, wipe and clean the various parts in the equipment, conduct a comprehensive cleaning of the fin heat exchanger, add an appropriate amount of lubricating oil to the moving parts such as fans and bearings, and reinforce the parts. Adjust the belt.

The equipment is systematically inspected once a year, and screws, grounding, computer boards, support springs and other parts are inspected and adjusted, and the measuring instruments are sent to the Bureau of Quality and Technical Supervision for measurement.

According to different types of heat pump products (direct exhaust, condensing or heat pump), factors such as exhaust channels, drainage facilities, and direct sunlight also need to be inspected and dealt with.

What are the common faults and solutions for household heat pump products?

High pressure protection, low pressure protection, thermal head failure, compressor not running, fan not turning, etc.

High-voltage protection: Check whether the water system is blocked, scaled, insufficient flow, etc., check whether the unit components are dirty, blocked, exhausted, high-voltage switch damaged, etc.

Low-pressure protection: Check the refrigerant system for fluorine leakage, blockage, expansion valve failure, etc., check for frosting on unit components, dirty evaporator, etc.

Temperature sensing head failure: Check whether the wiring of the temperature sensing head is false, measure the resistance of the temperature sensing head to see if it is normal, and replace the temperature sensing head if there is any abnormality.

The compressor does not run: check whether the power supply voltage is normal, check whether the AC contactor, protector and wiring are in good condition, check whether the motor part of the compressor is overheated or overloaded, reset the water temperature or reduce the load.

The fan does not turn: check whether the starting signal of the fan on the motherboard is normal, check whether the AC contactor is intact, check whether the capacitor is loose or bulging, and replace the capacitor or motor.

What should be paid attention to during the use of household heat pump products?

Regularly clean the water filter, fin heat exchanger, dust box and other components to ensure clean water and good ventilation.

Do not pile up debris around the unit, so as not to block the air inlet and outlet and affect the normal operation of the unit.

Do not use or store flammable and explosive gases or liquids near the unit to avoid fire or explosion.

Do not change the installation site at will, and do not disassemble or adjust the components in the unit by yourself. If there is any failure, please contact the after-sales service in time.

Do not touch the running fan to avoid personal injury.

Do not use chemicals or solvents to clean the unit, so as not to cause cracking or deformation of parts.

When the temperature is low in winter, it is not recommended to cut off the power supply of the air source heat pump to avoid equipment freezing or pipeline failure due to low temperature.

What are the pros and cons of home heat pump products?


High efficiency and energy saving: Household heat pump products use the low-grade heat energy of air or water to raise the temperature through a compressor to produce hot water or heating. For every 1 share of electrical energy consumed, 3-5 shares of heat energy can be generated.

Environmental protection and safety: Household heat pump products do not use any fuel, do not produce open flames, waste gas, waste water and other pollutants, and have no safety hazards such as fire, explosion and poisoning.

Flexible heating methods: The heating end of household heat pump products can choose floor heating, fan coil unit, radiator, etc., and can be freely matched according to user needs.

High intelligence: Household heat pump products have a built-in microcomputer control system, which can realize functions such as automatic operation, timing switch, switching mode, and temperature setting, and the operation is simple and convenient.

Long service life: The service life of household heat pump products is generally about 12-15 years, and proper maintenance can extend the service life.


High purchase cost: The price of household heat pump products is higher than that of ordinary electric water heaters or air conditioners, which requires a certain amount of investment.

Heating efficiency is affected by ambient temperature: Household heat pump products absorb low-temperature heat from air or water to produce high-temperature heat, and heating efficiency may decrease in winter when the temperature is low.

What brands are recommended for household heat pump products?

Guangdong Runmiao/SMT: It is one of the earliest enterprises engaged in the production of air energy in China. It has a number of patented technologies and the right to formulate standards. The product performance is stable and suitable for heating in the north and hot water in the south.

Mitra: It is a professional air energy manufacturer, with more than 500 scientific research patents and a complete product line. The product quality has passed a number of certifications, and it has won honors such as the brand selected by the Chinese Arctic and Antarctic Expedition Team.

Haier: It is a well-known home appliance company in China. It has five global R&D centers and a leading intelligent laboratory group in China. It has participated in the formulation of a number of national and industry standards. Its products cover all scenarios, full coverage, and one-stop air energy solutions.

Gree: It is the first 100-billion-dollar home appliance listed company in China. It has strong technology research and development and brand influence. It has been listed in the “Top 100 Listed Companies in China” by the US “Fortune” magazine for 12 consecutive years, and its product quality is ahead of Chinese manufacturing.

Midea: It is a global technology group covering consumer appliances, HVAC, robotics and automation systems, etc. It has about 200 subsidiaries and about 150,000 employees around the world, and its business involves more than 200 countries and regions.

The above brands are relatively well-known and reliable suppliers of household heat pump products, and you can choose according to your needs and budget.

How about these brands in terms of after-sales service?

Different brands of household heat pump products may have some differences in after-sales service. Generally speaking, a certain period of free warranty and maintenance services will be provided, as well as value-added services such as installation, cleaning, and disassembly for a fee. For specific after-sales policies and charging standards, please refer to the official website of each brand or consult the customer service hotline.

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