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Lochinvar Boilers

Products - Lochinvar Boilers

Money-saving 95% efficiency and easier than ever to install!

Lochinvar® KNIGHT floor-standing fire tube-boilers feature reduced installation footprint for flexibility in boiler placement. Plus, all connections are on the top and left side, so KNIGHT is an easy drop-in replacement for older, less efficient boilers.


  • Con·X·Us® Remote Connect Capable
  • Loch-N-Link ® USB Drive Setup
  • 3 Setpoints with Outdoor Reset Curves
  • DHW Recirculation Pump Control
  • Floor-Standing Fire Tube Design 6
  • Models: 55,000 – 285,000 Btu/Hr
  • Up To 10:1 Turndown Ratio Direct-Vent Flexibility To 100 Feet


The KNIGHT fire tube boiler operates with low pressure drop. The design incorporates a small volume of water in the heat exchanger. This allows the boiler to be installed in a primary/secondary or a full-flow piped system. There is no need to change the piping to accommodate the boiler. The boiler adapts to the system. This flexibility allows for a faster, more cost-effective boiler upgrade.


Modulation turndown up to 10:1 means the firing rate automatically changes as the heat load varies. A KHN110 KNIGHT boiler fires at its maximum 110,000 Btu/hr rate when load is highest, then “turns down” to as low as 10% (11,000 Btu/hr) as load decreases. A modulating boiler runs smoothly and efficiently, without frequent on/off cycling.


KNIGHT boilers can operate with low gas supply pressure. Negative Regulation uses a pre-mix gas system instead of relying on utility pressure through the gas valve. The result is steady operation in low gas pressure systems or when gas demand is highest. Automatic fan control fine-tunes the air/fuel ratio, providing superior combustion throughout the operating range.


KNIGHT boilers can be installed with direct-vent air intake and exhaust runs up to 100 equivalent feet, using PVC, CPVC, polypropylene or AL29-4C stainless steel vent pipe.

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