"YAPH" wrote in message
...
On Mon, 20 Apr 2009 19:28:14 +0100, Andy Champ wrote:

I'm inclined to the same view on swapping the boiler for a condenser.

Indeed: unless you're heating a draughty, poorly insulated mansion which
you can't improve the efficiency of it's not worth while throwing out a
working standard-efficiency boiler and replacing it with a condensing one.
Not even for a 65% SEDBUK dinosaur.

What figures do you have on this?

If you have to replace the boiler anyway, for other reasons (e.g the
dinosaur is falling apart with corrosion) then the energy saving is a nice
bonus. However to then spend the price of a second boiler on a gizmo to
improve the fuel efficiency by a marginal amount makes singularly little
sense whatever the circumstances.

You need to do some figures. Going from 60% to 92% saves a hell of a lot of
expensive gas.