Lochinvar’s FTXL Fire Tube Boiler features a stainless-steel fire tube heat exchanger, which delivers 98% thermal efficiency and 10:1 turndown. Available starting in June 2014, the new line includes five models with inputs ranging from 399,000 Btu/hr. to 850,000 Btu/hr. Each model features the same compact size with a 6.2-sq.-ft. footprint. The FTXL boiler is equipped with Lochinvar’s most advanced SMART SYSTEM interface yet. Offering a wealth of new control features, the operating system allows for remote communication with the boiler via Wi-Fi or a wired Internet connection.