Remember, always make sure that whoever you choose to install your new boiler is fully qualified and, on the Gas Safe Register. The Gas safe register is an official list of businesses that are legally permitted to carry out gas work. Every registered business with GasSafe employs engineer(s), who are issued with a Gas Safe ID card. Unfortunately, not all engineers are qualified to do all types of gas work – so remember to check their ID card before any work is carried out.