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.

Standard Features

• Up to 94.6% Thermal Efficiency
• Modulating Burner with 5:1 Turndown
• Direct-Spark Ignition
• Low NOx Operation
• Sealed Combustion
• Low Gas Pressure Operation
• Vertical & Horizontal Direct-Vent
• Category IV venting up to 100 feet
• PVC, CPVC or AL29-4C Venting up to 100 Feet
• Factory Supplied Sidewall Vent Termination
• ASME Stainless Steel Heat Exchanger
• Gasketless Heat Exchangerf
• 160 psi Working Pressure
• On/Off Switch
• Adjustable High Limit w/ Manual Reset
• Flow Switch
• Inlet & Outlet Temperature Sensors
• Flue Temperature Sensor
• Low Air Pressure Switch
• 50 psi ASME Relief Valve
• Temperature & Pressure Gauge
• Adjustable Leveling Legs
• Condensate Trap
• Zero Clearances to Combustible Material

SMART SYSTEM provides unequalled control and monitoring functions that are easy to understand and use.

• 2-Line, 16-Character LCD Display
• Password Security
• Building Management System Control
• PC Connection
• Outdoor Reset
• Night Setback
• System Pump Control and Boiler Pump Control
• Pump Relay with Freeze Protection
• Hot Water Generator Compatibility
• Inlet/Outlet and System
• Temperature Sensorsf
• Low Water Flow Indicator
• Product Service Indicator
• Field Connection Versatility