"Andy Hall" wrote in message
...
On Wed, 31 Mar 2004 17:09:40 +0100, "IMM" wrote:

"John Rumm" wrote in message
.. .
IMM wrote:


One factor you always seem to ignore
when presenting this argument is
the cost of installation.

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

Zone valves are hardly expensive, are they?

They are. 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.

While the cost of the boilers may not work out
costing much more than the cost of a larger boiler,
it is going to cost getting on for double the
amount to install.

Absolute nonsense. If anything it will be CHEAPER to install. In an
existing system, separating the system to upstairs and down may in some
case
prove problematic, but in most system the upstairs and downstairs are two
separate loops.

Really? This rather depends on whether the pipes run under the
ground floor, doesn't it?

Read on...

This is a TWO zone setup. If you wanted the same from a single boiler it
would be more complicated and the same applies to the pipework runs pof
both.

In many cases the cost of
installing is significantly more than
the cost of the boiler.

Absolute nonsense !!!!!

Labour costs in what has become a
premium trade are not cheap......

Read what I wrote above. It is clear.

If you go for two boilers on
different floors, then you also need to
find a place to install the second - in
many properties this is not a
trivial task.

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!

You are going to be paying to have
two boilers serviced
annualy as well.

You can always get a deal with two boiers when they next to each other.

Hmmm......

There are advantages and also disadvantages
of any setup - a win / loose situation.

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.

The Junior
doesn't even have a 3-way valve making it more reliable. Every other
point
you raised was wrong. Two Worcester-Bosch Juniors cost from under £100 to
around £1100. Giving approx 21.3 litres/minute. Go and find a single
boiler that can do that at that price. The ECO-Hometec, although a
condensing boiler, can go to 22 litres/min, but at just under 2K for it.
And when it is down no heat or hot water, unike the two combi setup.

If any boiler is so bad that it needs a second unit as a backup in a
domestic situation, then it doesn't deserve house room.

You clear haven't a clue. Another know-it-all. Read what I wrote again.
Read about the system and its advantages in:

- space saving,
- redundancy,
- high flowrates,
- Natural zoning,
- hardly any electrical control work (running a wire to a programmers/stat
and power to each,
- simple no brainer installation,
- minimal components used.
- etc.

Now read it again and come back with sensible questions.

This method is catching on and most makers now, will give a diagram on how
to combine the outlets of the boilers. Worcester-Bosch will give one.

An immersion heater in a cylinder
is a more useful solution in the
event of boiler failure since a totally
separate energy source is used
as well.

You haven't read the thread have you?