There are four types of solar collector, flat plate type, vacuum pipes type, heat pipe type and U type. Vacuum tube, heat pipe, u-shaped tube collectors can be used for big project. Heat pipe solar collector can collect heat from the sun to apply hot water. It has many advantages such as working temperature can be lower at 50 degrees below zero and no need electricity. So there are few tips for you to choose. There are four advantages of flat plate type solar collector. (1)High thermal efficiency;(2) Sheet metal structural formula;(3) Maintenance-free;(4) 15 years lifetime;(5)High cost performance.