The Dunkirk Excelsior EXB Three-Pass Oil Boiler features a more compact design than its predecessor for an even easier installation. The unit features a High Limit Control with LED Display, easy-to-program Dial Settings, Boiler Water Temperature Reset and Low Water Cutoff functionality. The EXB is easy to service with wide flue ways, a flexible oil line, a dual-hinged swing door with left or right mount option, sight glass and a test port. The low mass design is eco-friendly, too, with AFUEs as high as 87% and low standby losses.