Lochinvar announced the next generation of the KNIGHT XL commercial boiler product family. Available in five models, ranging from 399,000 to 1 million BTU/hr, the advanced units feature a 97% thermal efficiency, a 10:1 turndown ratio and an updated heat exchanger. Offer extended venting (up to 150 feet), backside connections and the ability to cascade multiple units for increased output, making it ideal for retrofit and new construction applications.