This offer is available for domestic and business properties with a total system output of up to 42kW. It excludes warm air units, some LPG and oil boilers for commercial use, this will be confirmed at your appointment. The discount is off the total quote and will be applied at point of sale on the basis that we install the boiler. This offer cannot be used in conjunction with any other British Gas boiler offer. For Business Installations please visit britishgas.co.uk/business/boilerinstall.