In article ,
IMM wrote:
Stored hot water - so water (hot and cold)
available if mains supply fails

-This is so rare an event that is it is not worth taking into
consideration.

Really? Happens here in London often enough to be a consideration.

Immersion heater backup - hot water if boiler or gas fails
Warm airing cupboard

That can be achieved with any heating system, so not so.

Perhaps you advocate instant electric water heaters above every basin etc
just in case?

Cons
Cylinder needs replacement (in this case to comply with building
regs)

-Cylinders may need replacing every 8 to 10 years in hard water areas.

Do you source them from China, like your power tools? Good quality ones
won't be effected by hard water - why should they?

Storing hot water not as energy efficient
More complex controls
More costly than combi to install

-Very poor shower pressure, having to use an expensive and noisy power
shower pump in some situations.

As opposed to poor flow from a combi fed one?

-The cylinder takes up space.
-Ugly zone valves and pumps around cylinder.

Some might say them being easily acessible a benefit. Of course they would
be ugly if you fitted them since you're not a plumber...

Combi
Pros
High pressure showers without pumps
Only heats hot water you use
No stored water (flooding issue)
Frees cupboard space

-No wating for cylinder to reheat

Never heard of fast recovery cylinders?

-HIgh pressure shower after shower can be taken.

Becuase they will allow the above...

-Have a high output, so house warms up faster.

I take it you always fit undersized conventional boilers if you have
problems with speed of warmup?

-All the system is inside the one white box.

So it all needs replacing at once with some failures?

-No pipes to freeze in the loft

You've not heard of insulation? Strange.

Cons
slower bath filling

High flowrate combi's are available, so not true.

Please give comparitive costs of uprating incoming water and gas mains,
and the extra cost and size of your little white box that can do all this
to match even a modest storage system in this respect?

No warm airing cupboard

A small rad can be installed in the airing cupboard taking up no space.

Did you get frightened by a storage system as a child, or is installing a
storage system properly just beyond you - the most likely explanation.

--
*The older you get, the better you realize you were.

Dave Plowman London SW 12
RIP Acorn