The tankless solar water heater also called Integral vacuum tube solar collector,which is made of 137mm large-diameter vacuum tube.As its name suggests,in an integral vacuum tube collector storage system,the collector and tank are combined into one single unit .Because the diameter of solar vacuum tube is much big.So it works not only as a solar collector, but also a water storage tank.So the household tap water is heated and stored within the combined heat storage and collection unit.
