... Design 2.Reasonable Price 3.High Quality 4.High Efficiency Solar Heater1. CE ,ISO9001, CCC,SGS2. Anti-freezen&pressurized3. With single ... : New trivalent element heat tubeVacuum tube: 58mm diameter, 2100mm lengthworking station: controller, Circulation pump, expansion tank 5L-8L, manometer, flow-meter ...