NY was thinking very hard :
The new shower (9 kW rather than 12 kW) was just about OK in the summer, but
on a freezing cold day like we've been having recently, it was impossible to
get more that a piddly trickle if you wanted the water any warmer than tepid.

Mine is a 9.5 or 10Kw, not sure without checking, but I find it more
than adequate. It still has good flow, even when set far too hot. Guess
I must be made of sterner stuff. Its 'adjust the flow, to get the
temperature' 7.5Kw predecessor was not really adequate at all, it
needed constant adjustment to keep the temperature right.

Just dial in 5 on the temperature setting, push the button and its
fine, even in this weather.