IMM wrote:

to give some heat in the house and DHW too. Combine the outlets for DHW and
all the baths you want very quickly and no waiting. It will do two showers
no problem at all. A win, win, situation.

While there are attractions to a two combi system, to describe it as a
win win situation would be a best misleading.

One factor you always seem to ignore when presenting this argument is
the cost of installation. 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. In many cases the cost of
installing is significantly more than the cost of the boiler.

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

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

--
Cheers,

John.

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