EN12976 High Pressure Compact Heat Pipe Solar Water Heater System are systems which producing hot water from solar based on the principle of nature circulation between cold and hot water. The advantage of this system is that it avoids using a conventional pump. The thermosyphone systems are avaliable in two types and wach type has three designs. The basic type features a heat pipe vacuum tube collector. For both types, all neccessary pipe, fittings and freeze protection are included with delivery.