Lochinvar is enhancing its top-performing high-efficiency condensing residential KNIGHT Fire Tube Boiler series with 95 percent DOE AFUE and advanced control functionality for optimized heating comfort. Now in its fourth generation, the designed, engineered and assembled in the U.S.A. KNIGHT Fire Tube Boiler contains 13 models — seven wall-mount options (55,000 to 399,000 Btu/hr) and Read more