All gas boilers and appliances should be installed by a Registered Gas Installer. A Registered Gas Installer should carry out all works in compliance with the Domestic Gas Installation Standard IS 813:2002. This standard requires that the installer provides a 'Declaration of Conformance' for your gas installation. This acts as assurance that the gas installation has been carried out to the correct safety standards. If you have just moved into a new home or have just had a gas installation to your existing home, insist that your builder or service provider supplies you with a copy of the ‘Declaration of Conformance’. See more information on Gas safety at home. Did this answer your question? Yes No Thank you for your feedback