In terms of brands, Tsinghua Sunshine, Huangming, Linorite, Sunray, etc. are all big brands
But in terms of quality, the above brands are indeed good, but the quality is similar to them. and the price is higher than them. There are also many cheap solar companies in Haining, Jiaxing and Haiyan in Jiaxing, Zhejiang that are of comparable quality.
How long are the 20 tubes. Niu brand solar water heaters?
Make sure you release hot water first? (If it is hot water, it means there is no problem with the pipe.) Then confirm where the water is leaking from? (Has the vacuum tube exploded? Or is it overflowing and leaking?) If the water in the last bar cannot rise, it should be that the water level sensor is broken (it is It may also be that the sensor position is too high). If it is broken, simply replace it with a new one. Before you can holeFor after-sales service, it is recommended to add water only to 50% or 80%.
The vacuum tubes used in solar water heaters are divided into 47 and 58 mm according to the diameter, and 1600, 1800 and 2100 mm according to the length. Consult the Niu brand solar water heater manual. There should be instructions in the manual. Or consult the dealer or after-sales service. I hope this helped you. Please adopt.