Lochinvar is enhancing its top-performing high-efficiency condensing residential KNIGHT Fire Tube Boiler series with 95% DOE AFUE and advanced control functionality for optimized heating comfort. Now in its fourth generation, the designed, engineered and assembled in the US, the series contains 13 models — seven wall-mount options (55,000 to 399,000 Btu/hr) and six floor-standing models (55,000 to 285,000 Btu/hr) — with turndown ratios of up to 10:1.