IMM wrote:

It will do two as most showers are approx 7 to 8 litres/min.

In our area, it won't do one at 6pm. The flow rate varies throughout the
day between 12 and 6 litres/min dependent on the total demand. I have no
intention of fitting new input pipes when the existing non combi system
can provide 40l/m for the period required to run baths. We also average
one water supply failure/yr, so I would not willingly give up the local loft tank facility.

Regards
Capitol

Regards
Capitol