Brand and price of wall-mounted solar water heater?

I have been engaged in the research of split wall solar since 2005. During this period, I also acted as an agent for 5 brands in Jiangsu and Zhejiang, but all of them were deceived by the manufacturers and lost their money. I also had to resolve a series of after-sales issues. After several failures and nearly five years of market testing, after many technical improvements and system upgrades, it has now reached the stage of production and popularization implementation. Although there are many wall products on the market today, few of them can actually achieve the desired effect. Due to limitations in installation conditions and lighting, most of their hot water is secretly heated by auxiliary electrical equipment (after conducting research on the subject). market) The conclusion drawn from performance monitoring and testing of more than 90% of professionalsduits), which also includes well-known brands that have caught up (the key depends on their business, if a dairy farmer makes solar energy, it's fucking nonsense), in fact, most of 'among them are. Most manufacturers do not make their own products, but do OEM processing. Maybe they themselves don't even understand how to install and apply them, so they already have them in place. the market, often misleading dealers and harming consumers. When you see at an exhibition wall products of several well-known brands that look like twin brothers, you will be amazed at the imitation ability of our people. For example, before the toxic milk powder of “Sanlu” and the bodybuilding pigs of “Shuanghui” were exposed, the victims were generally the consumers. We cannot use money to challenge our conscience and our morality. LThe only way out is to do good things in a down-to-earth way and put the interests of the people first.