Thermosiphon roof mounted solar system

How they work

All Neopower solar hot water systems, where the tank is roof-mounted, use the Thermosiphon principle to collect heat from the sun and transfer it to your hot water. The Thermosiphon principle is based on two naturally occurring phenomena:

  • Dark objects absorb heat
  • Hot water rises

Neopower solar collectors are coated with a dark, heat-absorbent surface. This coating absorbs the energy from the sun’s rays and heats the fluid in the collectors. As the fluid heats, it rises to the top of the collectors and into the tank where it displaces cooler fluid which flows in to the bottom of the collectors where the process is repeated.

The greater the temperature difference between the fluid in the solar collectors and the water in the tank the faster the flow between them.

In open circuit systems the fluid in the collectors is water, while in closed circuit systems a special anti-freeze fluid is used. Closed circuit systems are recommended for frost prone areas or in situations with poor water chemistry.

Utilising the thermosiphon principle, Neopower solar water heaters constantly soak up the sun’s energy to maximise your energy savings.

The right model for you

There are a range of Thermosiphon models to suit most situations, including frost areas, small to large homes and areas of low solar-gain or shade, to name a few.

All Neopower thermosiphon solar hot water heating systems come with a range of boosters including in-tank electric or in-line gas boosters to ensure you always have hot water on tap even on cold & cloudy days.