Seilar Solar Water Heater

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  • Seilar’s roof mounted tank systems save space at ground level and their elegant simplicity make them efficient and reliable.
  • All Seilar 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
  • Seilar solar collectors are coated with a dark, heat-absorbent surface. This coating absorbs the energy from the suns 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 antifreeze fluid, called Hartgard, is used.
  • When heated in the solar collectors, the Hartgard is circulated in a jacket around the tank to transfer the heat to the water inside. Closed circuit systems are recommended for frost prone areas or in situations with poor water chemistry.
  • In this way Seilar solar water heaters constantly soak up the sun’s energy to maximise your energy savings.

With a Seilar thermosiphon solar hot water heating system you can choose from a range of boosters including in-tank electric or in-line gas boosters to ensure you always have hot water on tap even on cloudy days.