This offer is available for domestic and business properties (with a total system output to 44KW). It excludes warm air units and quotes obtained online. The discount will be applied at point of sale on the basis that we install the boiler and only applies to the boiler cost and not on the installation or additional parts. This offer cannot be used in conjunction with any other British Gas offer and is valid for all appointments booked via website before 31 October. For business installations, please visit our British Gas business website.