(19)

(11)

EP 1 687 574 A1

(12)

(43) Date of publication: 09.08.2006 Bulletin 2006/32 (21) Application number: 04791618.4 (22) Date of filing: 29.10.2004

(51) International Patent Classification (IPC):  F24H 9/20(2006.01) (86) International application number: PCT/GB2004/004581 (87) International publication number: WO 2005/045327 (19.05.2005 Gazette 2005/20)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 31.10.2003 GB 0325399 (71) Applicant: HEATRAE SADIA HEATING LIMITED Norwich, Norfolk NR6 6EA (GB)	(72) Inventor: HAMMOND, Brian Norwich, Norfolk NR6 6EA (GB) (74) Representative: Harrison, Paul Richard  Novagraaf Norwich Limited Willow Lane House Willow Lane Norwich NR2 1EU Norwich NR2 1EU (GB)