"Christian McArdle" wrote in message
. net...
High flow rate combis suitable for multiple simultaneous showers are
much
more expensive than the simple modulating system boiler you would need
to
run your existing hot water system. Standard rate combis are well
priced,
but aren't brilliant running two showers.

Simple, use two combi's.

Which, by definition, doubles the price.

Doubles the price of smaller low priced units. Two W-B Juniors can be had
for around £1,000 and will deliver approx 20 litres/min. Look around for a
20 l/min combi and see what the prices are.

But it gives you so much more and highly cost effective. One combi does one
shower, one the other, with one not robbing the other, combine the two for
the bath to give a high flow. One does upstairs heating and one does
downstairs heating, both with their own stat/programmers. Two totally
independent systems. You can have the rad temperatures low upstairs and high
downstairs as well. If one combi drops out there is always heat in the house
and hot water (great bonus). No large cylinder taking up space and making
the place look like a school boiler room, just small neat white boxes on the
wall saving space. One poster has already done this with great success.

The only disadvantage is that there are two service costs. With two boilers
side by side a deal can be struck to reduce this.



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