(19)

(11)

EP 4 581 306 A1

(12)

(43) Date of publication: 09.07.2025 Bulletin 2025/28 (21) Application number: 23764911.6 (22) Date of filing: 04.09.2023

(51) International Patent Classification (IPC):  F24D 13/02(2006.01) H05B 3/36(2006.01) H05B 3/28(2006.01) (52) Cooperative Patent Classification (CPC): F24D 13/022; H05B 3/36; F24D 13/024; H05B 3/145; H05B 2214/04; H05B 2203/011; H05B 2203/013; H05B 2203/032; H05B 2203/016; H05B 2203/026; Y02B 30/00 (86) International application number: PCT/EP2023/074127 (87) International publication number: WO 2024/047254 (07.03.2024 Gazette 2024/10)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 02.09.2022 GB 202212834 (71) Applicant: NexGen Heating Limited Southampton, Hampshire SO16 7NS (GB)	(72) Inventors: OSBORNE, Clive David Southampton Science Park Southampton Hampshire SO16 7NS (GB) KINGSCOTT, Lisa Jane Southampton Science Park Southmapton Hampshire SO16 7NS (GB) (74) Representative: Butler, Daniel James  Concept IP Services Limited Brenton Lodge Holywell Road Wotton-under-edge Gloucestershire GL12 7NJ Gloucestershire GL12 7NJ (GB)