Not good. Tsinghua University is sunny. Top ten brands of solar water heaters
1 Huangming (famous Chinese brand, well-known Chinese brand, produced without national inspection, top ten solar water heaters)
2 Strap (inspection national -free product, top ten) Solar water heater, large enterprise)
3 Tianpu (domestic product without inspection, top ten solar water heater, large enterprise)
4 Huayang (Chinese famous brand, domestic product without inspection, top ten solar water heaters)
500 million home energy (China famous brand, domestic product without inspection, top ten solar water heaters)
6 Sun Rain (Chinese famous brand, domestic product without inspection, top ten solar water heaters)
7 Haier (China well-known brand, top ten solar water heaters, world brand Chinese)
8 Tsinghua Sunshine (famous Chinese brand, national product without inspection,ten best solar water heaters)
9 Linorite (Chinese famous brand, domestic product without inspection, ten best solar water heaters) < /p>
10 Huihuang (Chinese famous brand, national product without inspection, ten best solar water heaters)
1. The difference between solar tubes 58 and 47 is the inner diameter; The difference between long and short tubes is only in the contents of the tube.
2. The temperature in the northeast is very low in winter, so you need to choose good quality, which basically has nothing to do with 58, 47 or length. It is more suitable to use solar energy from heat pipes. It has strong heat absorption capacity, high thermal efficiency and better sealing than ordinary all-glass vacuum heat absorption tubes, but the price is much higher. »