Solar water heater tube or tube good
Can go to the store to see if the sales of various brands of heat collecting efficiency of the heat collecting area and tank capacity for each model to measure about which brand and which model is high, which is the unit collector area of the vacuum tube to generate more water, the higher the temperature is, the better the performance in general, this test is more difficult
To see the water capacity of the vacuum tube collector efficiency and the water tank is reasonable, in addition to concern whether the water temperature is high, should pay more attention to water capacity, some deliberately tank barrels do small, leading to the high temperature, low water unreasonable phenomenon
High efficiency, large water storage capacity, is now a large pipe
