With the development of the industrial revolution, at the beginning of the 19th century, people had a strong interest in the question of "whether heat can be" pumped "from the lower temperature medium to the higher temperature medium". British physicist J.P. Joule proposed the principle that "the temperature of a compressible fluid can be changed by changing its pressure".

However, with the development of heat pump technology, a new technology of electromagnetic energy water heater has emerged, which greatly improves the shortcomings of the heat pump water heater that cannot be used normally due to low temperature, greatly improves the full use of electricity, and alleviates the phenomenon of hot water interruption during bathing. At the same time, practitioners of heat pump water heaters need to keep the following points in mind in the process of operation and accurately convey them to consumers.

1. Do not use or store gasoline or other flammable and explosive gases and liquids near the heat pump water heater. Do not use the main power switch to turn on or off the heat pump water heater. Please provide an operable switch.

2. Do not put anything in the air outlet of the heat pump water heater, because the fan runs at a high speed, which may cause inconvenience.

3. The ambient temperature of heat pump water heater is - 10~38 ℃, and the water pressure is 0.20~0.6Mpa If the heat pump water heater is used in situations other than the above conditions, it may cause malfunction. It is reasonable for safety to ensure normal operation.

4. When maintaining, servicing and cleaning the heat pump water heater, the power supply must be cut off; When not in use, cut off the power and switch off.

5. Do not use gasoline, tiana water, volatile oil, solvents and other chemicals, or liquid pesticides on the heat pump water heater, or the parts may crack or deform.

6. The surroundings of the unit shall be kept dry and well ventilated.

7. Clean the air side heat exchanger regularly to maintain good heat exchange effect. If the shutdown time is long, the water in the unit pipeline shall be drained, the power shall be cut off, and the protective cover shall be put on. During re operation, the system shall be comprehensively checked before startup.