"Bob" wrote in message
...
Colin eclipse 2 wrote:
I know - done to death.. A customer has asked me this question. I
have come up with the following list. Any other thoughts - sensible
ones.. no need to start a debate about the merits - just need a list!

Conventional
Pros
Stored hot water - so water (hot and cold) available if mains
supply fails
Immersion heater backup - hot water if boiler or gas fails
Warm airing cupboard
Cons
Cylinder needs replacement (in this case to comply with
building regs) Storing hot water not as energy efficient
More complex controls
More costly than combi to install


Combi
Pros
High pressure showers without pumps
Only heats hot water you use
No stored water (flooding issue)
Frees cupboard space
Cons
slower bath filling
No warm airing cupboard


I think combis are a handy compact
solution for small flats. Anything
bigger and you're better off with a
conventional system,

Nonsense. Read this thread. There are high flowrate combi's available.
You obviously don't know of these.

if you want mains pressure hot water
and would like to free up the space in
the roof.

Getting better, or put the thermal store in the loft and free up space in
the living areas.

If I had to replace the hot water tank
as well as the boiler, I'd be looking
at thermal stores for sure.

Or a high flowrate combi.