"W" wrote in message
...

BTW: Worcester-Bosch do a 40kW Combi.
Again they are quite expensive.
Once you go above 30-35kW the prices
rise rapidly.

Then you use two combi's. The outputs can be combined for the bath taps
using two check valves and a small shock arrestor after the valves. Check
with the makers first. Worcester say you can using the Juniors. This is
highly cost effective and you can get 50-60kW combined output using two
cheapish combi's. Mid range combi's are cheap as they are the bulk of the
combi market and are competitive.

Best to split the outputs of the combi's: one does one shower, one the
other, etc and combine the outlets for the bath. One can also do downstairs
and one upstairs giving easy and cheap zoning.

A few installers are now using this method as it solves many problems very
cheaply.