The technological content of solar water heaters is not high. Tsinghua Sunshine is an old brand and Tsingda Guangguang is a new brand. They have the same configuration and similar quality (you can see this by looking at the warranty description), but the technological content of solar water heaters is not high. the price is different
Solar vacuum tubes are ordinary tubes (with water; they can also be made into heat pipe, with copper tube inside) and full carbon tube glass (with superconducting liquid inside)
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I think the top ten solar water heater brands with the best reputation include Huangming, Tsinghua Sunshine, Haier, etc. They are highly appreciated for their high efficiency, environmental protection, energy saving, high quality and other characteristics. They havehigh visibility and market share and have gained great popularity among consumers.