"Doctor Drivel" wrote in message
reenews.net...

It extracts even more latent heat from the flue of a condensing boiler.
They claim, with some independent validation, that a "condensing" boiler
can save 30% of its heating bills. There are no moving parts.

They claim that a combi can deliver 50% more water flow for the same
input - so a 12 litres per min job will be 18 litres, a big hype that
fills a bath pretty fast instead of a leisurely fill.

As a condensing boiler is supposed to be 90+% efficient how can they extract
another 30% from the waste?
Maybe they are lying, maybe the boiler manufacturers are lying, but they
can't both be true.