... 1. Solar water heater 2. SRCC, CSA, Solar Keymark, AS/NZS 2712 certified 3. Continuously improved design solar, solar water heater, solar collector, evacuated tube & heat pipe, solar renewable ... glass layers insulates against heat loss.Heat Pipe (HP)Copper vacuum pipe that transfers the heat from within ... x boxes of evacuated tubes Part #BOX ET/HP-10/10 *Additional tube packages available Part #BOX ET ...