Sorry Christian; I don't see where you are coming from.

I meant that the salesman should stick to selling baths and not give
ridiculous advice about plumbing systems that he doesn't understand. The
idea that the location of the taps makes any difference (although the actual
design of the specific tap might, regardless of location), or that poor
filling performance would be improved by getting a crappy instantaneous
combi is laughable.

Christian.