"Michael Chare" wrote in message
...
"Nige" wrote in message
...
In article ws.net,
Doctor Drivel wrote:

"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.

Many thanks for the tip.

From what I can gather, my current boiler is rated at a 'C', offering
around 85% efficiency - whereas current models are rated at 'A' which
equates to an efficiency of around 95%.

Would this 10% increase in efficiency offer me a straight 10% saving in
running costs - or is it (as I suspect), more complex than that? And
where does size (output) of the boiler enter the equation?

Heat lost from the boiler (and any conventional flue pipe) may still be
useful
to you if it helps to keep your house warm!

But not in the summer when it overheats it.

I doubt that the boiler efficiency tables take this into account, and to
that
extent I don't trust them.

They are a guide and they say anything arounf 3% is basically the same. You
can engineer a system to take full advantage of a condensing boiler,
promoting great efficiency, which it also does not take into account.