Thermal buffer: avoid surface evaporation of hot water with oil or other blocking product?

[gfgh64]

double pffft!!!

[Christophe]

grandpa izy is shaken from the jar...he's orangina!

[GuyGadeboisTheBack]

grandpa izy is shaken from the jar...he's orangina!

And all the more so since the "heater" of the tank can be effective in winter as long as there is sunshine (if it is solar, of course... the heater, eh, not the tank... ).

[sicetaitsimple]

And all the more so since the "heater" of the tank can be effective in winter as long as there is sunshine (if it is solar, of course... the heater, eh, not the tank... ).

Yes, well, we are in the Belgian Ardennes, there... Not sure that there are many hours of sunshine sufficient to supply solar thermal from say October 1st, if we assume that this is the date on which Christophe starts typing in his buffer for heating use (excluding preheating or DHW heating which works for him all year round). And also below a certain temperature (perhaps around 30°, if Christophe can specify?), the buffer is no longer used for heating, its temperature is too low.
It will certainly be necessary to wait until the following spring to have sufficient solar contributions.

[GuyGadeboisTheBack]

It's true that it's not the 04...

[izentrop]

And also below a certain temperature (perhaps around 30°, if Christophe can specify?), the buffer is no longer used for heating, its temperature is too low.

Unless the buffer powers a heat pump.