Active Closed Loop Solar Water Heating Systems 


Closed Loop Solar Heating Systems are suitable for single and multiple solar heating application systems, e.g. domestic solar water heating , solar water heating hot tub, solar swimming pool heating or solar space heating systems. The Closed Loop Solar Heating Systems are suitable for areas with questionable water quality and all climate conditions. The Closed Loop Solar Heating Systems are the preferred option for extremely cold areas.


NOTE: The information presented in this page is for guidance only - no part of this may be used for any agreement, whether expresseded or implied, or to form any contract. THERMO TECHNOLOGIES reserves the right to change specifications and prices without prior notice.

1. Collector 7. Check Valve 13. Pressure Gauge
2. Collector Sensor 8. Hose Bibs for Filling and Flushing 14. Collector Supply
3. Manual Air Valve 9. Expansion Tank 15. Heat Exchange Coil
4. Hot Water to Taps 10. Air Scoop &  Air Vent 16. Solar Hot Water Tank
5 .Tempering Valve 11. Circulating Pump with flanges or couplings 17. Immersion Heater
6. Collector Return 12. Pressure Relief Valve 18. Differential Controller
  • The Controller (18) will switch on the pump when the temperature at the collector sensor TC is higher than the return temperature TR by at least the pre selected (delta T) amount.
  • The pump circulates a heat transfer liquid around the loop.
  • Heat from the collector is transferred to the domestic water through the heat exchange coil in the tank.
  • With the pump running, if delta T is not met, the pump will switch off.
  • When a preset tank temperature is reached at Tmax, the controller switches off the pump.
  • The check valve (non-return valve) prevents heat from the tank rising towards the collector should the tank be warmer (e.g. at night).

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