What is this on roofs I found on google earth?

[nukenorman 44]

Was looking at random places on Google earth. This French territory Island in the Indian ocean called Reunion mostly all the houses have this on the roof. Anyone know what it is?

 

[+Zag L. 683]

Perhaps a solar water heater?

[Sylar0 98]

Not solar panels?

[Matthew S. 753]

Solar water heater

[nukenorman 44]

Thank You all so much for your responses. Now I know that it is a water heater. Everyone on that Island almost seems to have one. Never seen solar water heaters before where the big water thing is on top of the roof!! usually the solar panels just look flat.

[Human.Online 8,079]

11 minutes ago, nukenorman said:

Thank You all so much for your responses. Now I know that it is a water heater. Everyone on that Island almost seems to have one. Never seen solar water heaters before where the big water thing is on top of the roof!! usually the solar panels just look flat.

It is a solar water heater, which is absolutely not the same as a solar panel that provides power.  These are much simpler and for a much more specific purpose.  Common over a lot of Mediterranean Europe.