I just had my central heating boiler serviced
by the gas company here,
for the first time in 14 years.

The service engineer said the boiler (Potterton "Profile Prima")
as in good nick, which surprised me.
But he mentioned that there are now "condensing boilers"
which save a bit of heat, as they extract heat from the fumes
which are expelled outside the house in older models.

Is it worth going over to such a model?

--
Timothy Murphy
e-mail (80k only): tim /at/ birdsnest.maths.tcd.ie
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland