... heat pressurized solar water heater 1. ISO 9001, CE, CCC; 2. With Copper coil in inside water tank; With high quality vacuum tubes as solar ... collector, absorption percentage 91-94%. Very easy to install on the roof. Water tank housing is made ... and windproof, firm and stable, easy to install.Tube quantity is optional, from 24 tubes to 30 tubes.Material:1. Inner tank ...