It is the first generation but has several shortages. Firstly, the temperature and pressure of output water will be affected easily by climate, so the water temperature is instable and can hardly be regulated. Secondly, its burning consumes a huge amount of energy and exhausts much poisonous waste gas. In addition, its lifespan is short.

2. High-power Electric Water Heater

This kind of water heater mainly has two disadvantages. The first one is resulted from the high energy consumption. There is a large possibility of electric leakage, which may harm users, and insufficient water storage. What’s more, the water temperature is so high that it will make the tank inside seriously scaled and reduce the service life of itself.

3. Solar energy water heater

Theoretically, this is the most energy-efficient water heater. However, in the rainy or cloudy days or the winter of the north, the solar energy water heater must be operated with the assist of an extra electric power. This extra power system serves as a huge electric water heater which hides serious security issues. Because of the open-type system of the solar energy water heater, the pressure of hot water completely depends on altitude difference. As a result, the degree of comfort is not good enough. In addition, the vacuum tubes, which are commonly used by general the solar energy water heater, are quite frangible, and the maintenance of it will bother you too much.

4. The fourth generation: air source heat pump water heater

The price of air source heat pumps water heater is high, but it is multifunctional. Aimed at the existing situation, we know that this product can transfer the heat from the air into the water tank. Then it heats the water and exhausts the cooling air, which lose a quantity of energy, into the kitchen at the same time. When the air loses energy, its temperature will fall and a quantity of steam will condense. As a result, the humidity of the cooling air will be reduced. In a word, this product can be used as a multi-functional installation that combines the functions of central energy-saving heating, kitchen (toilet) cooling and local drying. The cost performance and usability of this product has been highly developed. It will offer customers the high-quality enjoyment of live.