Burnham ALTA-120-1G02 97 Input MBtu 95% AFUE Gas Boiler has a flexible multiple-boiler lead-lag sequencer. It has an easy-to-use USB-Connect App and Bluetooth adapter. Intuitive boiler status and advanced system setup make this boiler perform seamlessly for years to come. It has a comprehensive energy management system interface a no-touch combustion setup, engineered for a five-minute start-up. With a 5-year parts warranty and, a 12-year limited warranty on the heat exchanger, rest assured this boiler is ready to serve for long years to come.