HIGH EFFICIENCY COMMERCIAL CONDENSING BOILERS
OPERATING CONTROL FEATURING
PERATING CONTROL FE
A BUILT-IN CASCADING SEQUENCER
5 MODELS: 399,000 – 800,000 BTU/HR
FIRING RATE MODULATION TO 5:1
LESS THAN 20 ppm NOx
DIRECT-VENT FLEXIBILITY TO 100 FEET
Up to 94.6%
Thermal Efficiency
Lochinvar.com
The Smartest Choice for Condensing Boiler Performance
The KNIGHT
The KNIGHT® XL, engineered with Lochinvar’s exclusive SMART
SYSTEM
it far ahead of any commercial heating boiler in its class. It promises
and delivers ultimate ease of installation and maintenance. With up
to 94.6% thermal efficiency, low-NOx emissions and a fully modulating
burner, it is the best ”green choice” for today’s environmentally
focused market.
Five modulating/condensing stainless steel KNIGHT XL boilers are
available, with 399,000–800,000 Btu/hr inputs, with remarkably
small space-saving footprints. All are equipped for direct-vent
installation with air intake and exhaust runs up to 100 feet using
PVC, CPVC or AL29-4C vent materials. This range of choices is ideal
for light-duty applications such as small hotels, schools and office
buildings. For higher-demand applications, up to eight KNIGHT XL
units can be installed utilizing the built-in cascading sequencer to
deliver up to 6.4 million Btu/hr heating capacity.
THE KNIGHT XL BOILER reflects Lochinvar’s constant commitment to
providing all the options you need to serve every application.
XL
™
control and an array of other innovative features, places
ineered with Lochinvar’s exclusive SMAR
This 4-unit installation
illustrates the spacesaving KNIGHT XL footprint.
The Knight XL Combustion System
Advanced Negative Regulation Technology
KNIGHT XL safely and reliably operates with supply gas pressure as low as 4 inches water column, as Negative
Regulation (Neg/Reg) technology automatically adjusts fan speed that ensures the correct volume and mix of
fuel and air throughout the firing range.
Two-in-One Stainless Steel Heat Exchanger
A combined primary and secondary heat exchanger captures flue gas heat
and allows entering water temperatures as low as 50°F. The stainless
steel, pH-tolerant design features a weld-sealed assembly with no
O-rings or gaskets, and does not require special glycol. ASME Section IV
approved and stamped.
Fully Modulating Burner
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.
The burner is a single stainless steel assembly covered with woven steel mesh, and fires in a 360°
pattern along the entire length of the primary heat exchanger. This allows the compact KNIGHT XL to
exceed the capacity of units with larger multiple burners.
esh, and fires in a 360°
he compact KNIGHT XL to