In article ,
polygonum wrote:
Their gas savings claims are based on the assumption that you have a
crap boiler now. But efficient boilers have been available long enough
that this is no longer a reasonable assumption.

Just plucked out of the air, since gas consumption depends on so many
things - not just the boiler design.

--
*Does fuzzy logic tickle? *

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