"Mike Harrison" wrote in message
...

So from this perspective, any recommendations, good or to-avoid for a
~30KW condensing Combi where
reliability, servicability and manufacturer service are good, even it if
costs more?

Look at the Intergas range. Built like tanks. The combi only has four
moving parts. The unit works on DHW even if the pump fails, which is a
standard Grundfos available from B&Q, not a £250 special pump only for their
model combi like many others. The pump is not used when using DHW, so
cheaper to run. No three-way valve. Simple, well built, well designed and
well thought out for maintenance. It can even be on an F&E tank in the loft
for simplicity. Get the outside weather sensor with it if you want
excellent comfort conditions. Some decent deals around for them. They are
well priced for what they are.