"tarquinlinbin" wrote in message
...

Yes,why oh why do combi installers chuck out a perfectly usable
cylinder,especially in large family houses?. My view for family
properties is to keep the cylinder,feed it from the combi,obviously
make sure things are well insulated/controlled.

This that is your view you should change it, as the cylinder will burst.
Find how water systems work. here are high flow combi's around, that will
do a large family.

An advantage of a combi is that it liberates space tanks and cylinders take
up.