Since its introduction in 2005, the KNIGHT modulating-condensing heating boiler has consistently delivered everything homeowners need for total comfort and long-term savings on energy costs.

With 5 floor-standing models and 5 compact Wall Mount units, Lochinvar offers the industry's broadest selection of modulating-condensing heating boilers. And KNIGHT is the industry's most advanced boiler design, including the SMART SYSTEM™ operating control that has quickly become a legendary benchmark among the trade!

KNIGHT safely and reliably operates with supply gas pressure as low as 4 inches water column, because "Neg/Reg" technology automatically adjusts gas pressure to ensure the correct volume of fuel and air entering the burner.

With each call for heat, two electrodes ignite the fuel/gas mixture. A third electrode then senses for flame. If no flame is detected, the system resets and attempts ignition four times. SMART SYSTEM will lock out and display a fault if ignition does not occur after four attempts.

A primary heat exchanger combined with a secondary heat exchanger capturing flue gas heat allows entering water temperatures as low as 32°F. The stainless steel, pH-tolerant design features a weld-sealed assembly with no O-rings or gaskets and does not require special glycol.

The SMART SYSTEM allows fully modulating combustion with 5:1 turndown. The burner can fire as low as 20% of maximum input, and modulates the firing rate up to 100% as demand increases. This allows KNIGHT's compact size to excel compared to units with larger multiple burners.