| benefit | restraint | Price |
| -Ecological -Inexpensive operation -covering daily needs | - maintenance costly -Various performance according to the season | 5k to 10k€ |
it used the heat taken from the panel to warm up the water and it used to make heat
Exemple of sollar heating
https://www.youtube.com/watch?time_continue=40&v=FgjfJGfusdE