"Andy Hall" wrote in message
...

At the present time there is a minimum SEDBUK efficiency of 78% as a
requirement for new boilers as part L1 of the Building Regulations.

There is a proposal (which you can find on the ODPM web site), to
raise this limit to 86% from April 2005.
This will effectively take all non-condensing boilers off the market
unless there is some technology miracle, because the highest is
currently 82%, whereas condensing technology achieves 90%+.

82% non-condensing? The CPSU Powermax has been discontinued and replaced by
an a unvented cylinder version, now being termed a "combi".

The max non-condensing efficiency is the Radiant RMAS 21 E/3S combi at just
under 81%.

This is rather academic as "peak" efficiencies may be 90-91 %. If a system
is engineered to attain that as mating it to a thermals store, then SEDBUK
is only a real rough guide. SEDBUK is being replaced by an EU method.



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