On Mon, 3 May 2010 21:24:34 +0100, geoff wrote:

with few exceptions, any boiler installed now has to have an efficiency
which eliminates installation of anything other than a condensing boiler

"condensing" does not mean "combi". A plain condensing boiler though
a little more complex than a burner, big lump of cast iron and flue
doesn't have all the flow switches, valves, interlocks and control
magicary that combis have to have.

--
Cheers
Dave.