In the past year, air-source heat pump water heaters have drawn more and more attention from new energy industry people with the advantages of all-weather, convenience and energy saving. With the development of air-source heat pump water heaters by many manufacturers producing solar water heaters and increasing the promotion of products , Many dealers and end-consumers repeatedly raise a question: Can air source heat pump water heater replace solar water heater? In answering this question, we think that we should analyze objectively and dialectically the advantages and disadvantages of these two water heaters, and compare the latter to draw the correct conclusion. First analysis of the advantages and disadvantages of solar water heaters, the main advantages are: do not consume conventional energy, safety, environmental protection, the use is still convenient. The disadvantage is: affected by the weather, the sun is not enough illumination can not be used, the need for conventional energy aids; up and down a waste of water within the tube wasted, the cold area is also due to the pipeline freeze and can not be used; a single installation affects the appearance of the building, by Property management department restrictions. The advantages of air-source heat pump water heaters are: free from the impact of the weather, 24 hours hot water can be provided at any time; according to the location of the nearest installation can reduce waste caused by waste water pipe emissions; and air-conditioning is nearly equivalent to the installation mode, unconditionally Property management accepted. The disadvantage is that although it is an energy-efficient product with obvious effect, it still consumes a part of conventional energy (electricity), which is also the reason for its use of regional barriers, that is, it is not available in the non-electrified area; and the low temperature ), Its COP value (coefficient of heating performance) is close to equal to 1, no energy saving significance. Through the analysis of the above advantages and disadvantages, it is not difficult to see that these two kinds of water heaters have their advantages and disadvantages in the use of performance, each with short length. Their mutual relationship should be complementary rather than who should replace whom. Air-source heat pump water heaters can be used in places with relatively high heating requirements in large and medium-sized cities in the south of the Yellow River in our country. In rural areas north of the Yellow River, solar water heaters can be used in places where heat supply is generally required. Of course, the ideal situation should be the combination of the two under the conditions. If the one-time investment is larger, the effect of energy-saving and environmental protection will be very obvious and the overall economic benefits will certainly be better.