Among these three products, air-to-energy water heaters consume more energy, while solar water heaters are the most energy efficient.
The so-called “space energy” actually combines solar water heaters and air-energy water heaters. In rainy weather, air energy is used to produce hot water, and in sunny weather, solar water heaters are used. to heat the water. The technology of this product is very immature and the product itself is of little importance. It is an inorganic combination of two types of products, the failure rate is high and the maintenance cost is high. Not recommended.
If there are installation conditions, it is recommended to choose a solar water heater with auxiliary electric heating.
Solar water heaters use sunlight to heat water (light energy is converted into thermal energy). As long as there is lightfrom the sun, there is no need for electric heating, so it is very energy efficient. As for the electricity consumed by the instrument, it can be ignored. Of course, if there are continuous cloudy days or rainy and snowy weather, electricity will be needed for heating. Good luck.