In article ,
Tony Bryer wrote:
Even Drivel didn't say you'd get a 40% saving on gas - he said *up to*
40% - which is a bit different - and grossly optimistic at that unless
you've got a literally 'stone age' boiler.


The OP's description was "a fifteen year old rarely serviced (probably
never since new)" boiler so the new boiler may well save 40% on the
present gas usage. But servicing the existing boiler might produce a
double-digit saving.

Well, the boiler is unlikely to use that much gas when sooted up - if you
continue to try and use it - and it does fire up - it will probably
explode. ;-)

However, until that point I doubt the efficiency changed at all during the
many years where it was working properly.

--
*All men are idiots, and I married their King.

Dave Plowman London SW
To e-mail, change noise into sound.