Selection of the lifting system - Aqualift F Compact

Yes, but you say that it can mess up the KfW calculation

Mine is 60x60x60 and was also included in the thermal insulation calculation back then.

It’s against the ground anyway – no real cold comes up from there. If necessary, the box will just be insulated as well

Yes, but you say that it can mess up the KfW calculation

Yep - that was the reason why my basement builder no longer builds them (in our case in combination with a white tank) - whether the reason is valid - no idea -> as a potential builder I would simply pass this question on to the energy consultant - if he says it doesn’t matter (like in your case) then everything is fine.

White tank is rather a problem – no matter how well it is sealed, it is a separation joint and thus a potential weak point, which is extremely difficult to access again.