"John" wrote in message
...

Is it possible to fit a small hot water
storage tank that would suffice for hand washing/
rinsing cups etc that is topped up by the combi?

In some of the older combis there was
a switchable preheat facility which
allowed the user to control keping a small
store of water hot for immediate
hot flow on demand. More modern simple ones
have largely lost this facility in the name of
progress

...and efficiency.

and the drift towards plate type heat exchangers
rather than small calorifiers within the casing of the boiler.

Plate heat exchangers are smaller and far more efficient.

You could select a current combi which
does keep a store of hot water or
stick with a storage system.

He wants a combi after having one previously. He sees the great benfits.

Can you find room for your extension by
perhaps relocating the tank and cylinder

Bad expensive move. He wants a combi after having one previously.

or changing to an unvented
cylinder whcih would at least "lose" the
storage tank.

....and is expensive to buy, large, and requires a BBA plumber to install.
Bad idea. A heat bank is far better, probably out of your experienece, but
you should get to know.

With a cylinder of either type you can
have an immersion heater as backup in the event of
boiler breakdown.

You can have a small instant electric water heater on the outlet of the
combi for backup, installed under a sink, at the back of a cupboard, etc.
takes no space.

The delay is due to the physical limitations of
the boiler going through its ignition and proving
sequence before actually lighting the fire so to
speak. One of my customers was extremely
****ed off when he moved away into
a new house with a Sime "ordinary" combi which
took about 40 seconds to deliver hot water each
time from cold and his water bills suddenly were
higher than his gas bills

That is a point in any water system with long dead leg hot water pipes too.
This lag is not just applicable to combi's.



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