"dennis@home" wrote in message
. uk...

"Tony Bryer" wrote in message
...
In article , Set Square 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.

I have a 24 year old boiler that's 84% efficient so it would take ages to
get the costs of a new one back.

Greater than 84% efficient and 24 years old? Make and model please? More
like 55% if that.