In article ,
IMM wrote:
Why is it worse, it makes wiring
simpler and gives more flexible
control options.

Two valve to go wrong. With a combi, there is no wiring.

Well, you apparently don't read this group where internal 'wiring'
problems are a prime cause of boiler failure. Or are you recommending some
non electric boiler with a clockwork timer?

--
*Confession is good for the soul, but bad for your career.

Dave Plowman London SW 12
RIP Acorn