... space heating 3.Cold area suitable 4.ISO9001, CE pass Heat pipe solar thermal collector1. Features(1)High efficiency vacuum tube ... a low thermal capacity, and rapid heat exchange (1000 times of copper heat exchange rate), heat exchange rate is up to 99%. The ... is heated to 25 °C, within 5s, it will transfer heat;(3) Special “TJ”design, make higher operation pressure, test pressure ...