"Nige" wrote in message
...
With the recent massive increases in heating oil prices, I've been
wondering if there would be anything to gain from replacing my existing
Grant Multi Pass oil-fired boiler - now around eight years old - with a
newer model.


Go to:
http://www.sedbuk.com Go to oil boilers then refined search. Pick your
boiler and see what the efficiency is. It probably have drop a few percent.
Then look at the efficiency of the condensing boilers.

Work it out from there.