After the building permit, 2 weeks, but only because DHI still absolutely wanted to finish the base slab before Christmas. Normally 4 weeks after the permit is granted, of course depending on the weather.
We are using the alpha Innotec lwav+ 82... with cooling function, just reaching the 4.5 annual performance factor for the subsidy. Which, as I want to mention, has been significantly higher since 01.01. Is Fa. Ernst also your heating installer?