The updated line of ARMOR condensing water heaters is available in 10 models, ranging from 399,000 to 4-million Btu/h. The larger input models are constructed with superior-grade 316L stainless steel, which reduces heat loss and provides a greater performance of up to 99% thermal efficiency and reliability for large commercial applications, Lochinvar explains. Features include a 10:1 turndown ratio, and direct vent flexibility up to 150’ in floor mount, wall mount, indoor, outdoor and convertible options.