Solar DHW Heating System Diagram (below) shows a typical layout of the components of a System.
This can be combined with other forms of heating so that when sunlight is less intense or lasting, the supporting system will increase the water temperature to the desired level.
Support Heating can be from:-
Boiler efficiencies have moved up and as fuel costs are rising it may be now that you should replace it with a condensing boiler. These are 98% efficient!
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