This service is for the manufacturers of unvented hot water storage systems.

Unvented hot water storage systems must be either:

  • Approved by a member body or the European Organisation for Technical Approvals (EOTA) - operating a technical approvals scheme e.g. meeting the relevant requirements of G3
  • Approved by a certification body having National Accreditation of Certification Bodies (NACB) accreditation and testing to the requirements of an appropriate standard that will ensure that the requirements of Regulation G3 will be met e.g. BS 7206:1990
  • The subject of a proven independent assessment that will clearly demonstrate an equivalent level of verification and performance to 1 or 2 above.