To be honest, from an owner of a 16kW unit, I am very happy with how it performs. It is able to modulate down to about 700W draw, while kicking out between 4 and 5kW depending on outside temperature, which is very decent minimum load!
I agree with you, it seems quite well built compared to the lower range.
Only thing I wish it had is a way to control an external On/off signal, so that I can have it control my fancoil units.
Anyone knows how? This is the bibloc unit, with the 230L HWT integrated in the internal unit.