First, the production of the installation as a whole should be considered, not a single panel. It is the installation in its entirety that will produce energy, and this will depend on the geographic location of the project (the length and intensity of sunshine throughout the year vary by geographic area).
The production will therefore vary not only according to the geographic location but also according to the power of the installation (number of panels), and consumption (for domestic hot water).
On the solar thermal side, a properly dimensioned DualSun Spring (PVT) panel installation will ensure an average coverage rate of 50 to 60% for a household's domestic hot water needs.
We suggest that you consult the energy study by the Transénergie design office.