(19)

(11)

EP 0 533 658 A1

(12)

(43) Date of publication: 31.03.1993 Bulletin 1993/13 (21) Application number: 90900241.0 (22) Date of filing: 06.12.1989

(51) International Patent Classification (IPC):  F22B 1/ 02( . ) F24H 7/ 04( . ) F22B 1/ 28( . ) (86) International application number: PCT/GB1989/001458 (87) International publication number: WO 1990/006477 (14.06.1990 Gazette 1990/14)

(84) Designated Contracting States: BE DE ES FR GB NL (30) Priority: 06.12.1988 GB 19880028421 06.12.1988 GB 19880028422 20.01.1989 GB 19890001281 04.10.1989 GB 19890022306 (71) Applicant: DIMPLEX HEATING LIMITED Southampton SO9 2DP (GB)	(72) Inventor: NEWTON, Peter, Joseph Hants PO11 9PD (GB) (74) Representative: Howick, Nicholas Keith  CARPMAELS & RANSFORD 43 Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)