(19)

(11)

EP 2 577 256 A2

(12)

(88) Date of publication A3: 02.02.2012 (43) Date of publication: 10.04.2013 Bulletin 2013/15 (21) Application number: 11739119.3 (22) Date of filing: 25.05.2011

(51) International Patent Classification (IPC):  G01N 17/00(2006.01) (86) International application number: PCT/GB2011/000792 (87) International publication number: WO 2011/148131 (01.12.2011 Gazette 2011/48)

(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 MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 09.02.2011 GB 201102241 25.05.2010 GB 201008691 (71) Applicant: Heating System Innovations Ltd Bristol, Somset BS1 6JS (GB)	(72) Inventors: CLAY, Michael Bristol, Somset BS1 6JS (GB) HARNETT, Ty Bristol, Somset BS1 6JS (GB) NORTHOVER, Matthew Bristol, Somset BS1 6JS (GB) (74) Representative: Bailey, Richard Alan  Marks & Clerk LLP 20 Imperial Square Cheltenham GL50 1QZ Cheltenham GL50 1QZ (GB)