"Andy Hall" wrote in message
...
On Wed, 31 Mar 2004 18:00:26 +0100, "IMM" wrote:

That is the point, it is cheap to install,
with no zone valves, etc.

Zone valves are hardly expensive, are they?

They are.

In the context of a complete
installation not at all.

You will need three with a normal boiler.
Then there is the fittings and pipe and
pressure by-pass valve, etc. The Junior comes
complete with one inside.

Which will be reflected in the cost. It isn't "free".

I gave the cost of two.

Read what I wrote above. It is clear.

With your writings, clarity is not a description
that I would use all that much.

You don't read properly. I am very clear.

You can put them both together One,or both, can go at the back of the
airing cupboard, still releasing tons of space by the redundant
cylinder.

... needing a gas supply to be run there.....

Great thing eh!

It all adds to the cost.

Not much

The two combi setup, has few disadvantages
and the only one you picked up on
is the increased cost of servicing, which is not
a great amount.

Only double, but that's not a lot, I suppose.

Nonsense again. No zone valves of any
sort would be in the system, either
externally or in the combi's. This make the
system as whole far more
reliable, with built-in redundancy.

What you are describing does not
equate to redundancy. You are
talking about a boiler per zone for heating
and hot water. Since you have described
these as being autonomous systems because of lack
of zone valves, it is not redundant in the least.

You will have heat in the house if one fails.

Redundancy would happen if both
boilers were plumbed together in such
a way that one would take over from the
other in the event of failure

That can be dow by linking them up and having a full bore valve on the link.
One down turn it on by the valve and both are pumpoing into both rad
circuits. Cheap and simple.

Having HW and heating available in
only part of the house is not
redundancy, it's impaired service - not
the same thing at all..

Better than no heat at all. Simple to link them up. See above.

You clear haven't a clue.

I clearly do...not have a clue.

Another know-it-all.

If you look at your typical posting style,
evident in this case, there
is only ever one way, as far as you are
concerned and everything and
everybody else is wrong.

This solution is the one in question. You clearly cannot assess such a
system in cost, functionality and simplicity.

I grew out of that attitude before my tenth birthday,

You must still be under 10 then.

Read what I wrote again.
Read about the system and its advantages in:

- space saving,

compared to what? Certainly not one boiler.

snip garbage

You clearly haven't a clue and lack simple analytical skills. Which is sad.