In article , Andy
Hall wrote:
Its an Ideal Mexico Super CF4140 - 140,000 BTU - 41kw £872

Poor choice. The SEDBUK seasonal efficiency figure for this
one is 78.6%.

The other thing is that according to the SEDBUK database the
output is a fixed 41kW, all or nothing. In the spring and autumn
the part load efficiency (which is admittedly taken account of in
the SEDBUK calc) is likely to be a lot less:

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk
Free SEDBUK boiler database browser
http://www.sda.co.uk/qsedbuk.htm