... heater (1.5kw, 2kw, 2.5kw, 3kw), assistant tank( 5L, 8L, 12L, 15L), magnesium barFeature:Working with high pressure, so do the water ... it produces.It uses the heat pipe to deliver the heat energy, it can work ... work alone, so it can still work in the event of occasional tube breakage. Heat Pipe Solar Water Heater