But the gains are terrific.

So you claim. However, claiming that capital costs are lower is simply
false. The capital costs are over double.

They run out though. No waiting for showers with a combi eiether. Ever
used
one?

Yes. You have to wait much longer, as you have to wait for the combi to fire
up and get up to speed, unless you have one with built in storage.

And "two" high pressure showers can be running all day. Can't get
that with a storage system.

Of course you can, if the boiler you choose has sufficient output (and the
cylinder has sufficient input) to cover the showers, then a storage system
would also not run out.

It is NOT. You require zone valves, which take up space and the control
wiring and knowledge to do it to boot.

It's hardly rocket science to wire up S-Plan systems. The wiring is
exceptionally simple.

It is NOT. See above.

It is extremely simple. If you're confused by wiring up a S-Plan system,
then you should have put down the tools long ago. It is only fractionally
more difficult that wiring up your iconic 2 combis.

In the US many are going over to multi-points that output 200,000 plus
BTUs/hr. On-demand hot water is regarded as much superior to stored water.
Bosch, Takagi and Rinnai are the big players. Two combi's is roughly the
same output. The largest output multi-point in the world is a Takagi.

Don't talk rot. They have crappy direct electric and gas heaters that have
the efficiency of a lit fart. They have very few instantaneous gas heaters
actually installed, although 24kW instantaneous electric heating is common
enough, with the obvious limitations thereof.

Christian.