Solar collectors Rainwater System -Heat exchanger - Underfloor Heating

All the warmth of the sun in the Solar Collectors Rain Water System is passed through the heat exchanger to water which is circulated by the underfloor heating boiler.

Here is the technical description:

The feedback loop from the underfloor heating to the building boiler, as it is the coldest water around the circuit, enters the heat exchanger, being heated by the other circuit where hot rain water has accumulated in the thermal tank. Thanks to this we can raise the coldest temperature of the circuit to higher levels than it would normally be, therefore assisting with the thermostatic control of the boiler. That’s why the boiler is turned on mainly after noon, when the sun warms the water a few degrees of its circuit.

Of course thanks to the optimum heat balance of the building and the effectiveness of the thermal inertia of the underfloor heating which keeps the soil warm for several hours, the boiler remains off at night and in the morning, returning to the circulatory motion next noon.
Concerning this closed heating circuit, we have no statistics yet as this is the first season that we have used the heat exchanger. But we do know that for the lodge, the coldest time starts as soon as we open, when the season starts. By late August the temperature of 1,000 liters of water on a normal day, which is usually sunny, exceeds 65 degrees Celsius, and the temperature inside the building between 20 and 24 degrees, we also know that the circuit of the floor heating has approximately 600 liters of water, so we estimate that we will reduce consumption significantly. The boiler is used until mid-December and as the days pass, solar system efficiency increases. This is the information that we used to assess the suitability of this floor heating system.