1. Separate Solar water heater, high pressure 2. Heat pipe vacuum tube 3. ISO, CE, CCC 4. SUS304 inner ... copper coil exchanger can be set in the tank.5. Heat the top water instantly, there is no need to wait ... :100L,150L,200L,250L,300L,400L,500L. Domestic high pressure heat pipe Separate Solar Water Heater 2 copper coils