Active Closed Loop Solar Water Heating for
DHW Linked with Swimming Pool by Heat Exchanger


A Closed Loop system can be used to link domestic hot water (DHW) and swimming pool to the same collector. It is normal to include domestic hot water in any multiple application as it is a year round requirement.


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

1. Solar Storage Tank 3. Swimming Pool Loop 5. Heat Exchanger
2. Electric or Gas Boiler 4.Cold Feed and DHW Out 6. Supply and Return to Collector


  • In the Solar Loop priority is given to the DHW tank by an aquastat (A) controlling the solar zone valves. When the tank reaches temperature the flow switches to the heat exchanger (2).
  • In the Pool Loop the circulation pump is activated.
  • This loop flows through the heat exchanger. If the heat exchanger is below, say, 72ºF the aquastat "A" redirects the flow through the boiler, activating the boiler at the same time.
  • The bypass, incorporating a mixing valve and a check valve, ensures that the swimming pool water cannot overheat by mechanically recirculating it when a set temperature is reached.
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