KN family of boilers: KN-4
Innovation sized to meet the low fuel use,
low installed cost, small footprint
demands of today's condensing light commercial and commercial boiler markets.
The KN-4 boiler is the ideal boiler for not only new construction, but for retrofit applications as well. It's perfect for the constantly growing radiant heat and radiant snow melt markets with its large Delta T capabilities. The KN-4’s small vent size allows the removal of older boilers while utilizing the existing vent as a chase for the new equipment, further lowering installation costs.
Condensing performance, cast-iron longevity
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Low Installation Cost
Low Operation Costs
Factory piped & wired packaged boiler in a compact footprint; capable of being rigged via pallet jack through a standard doorway.
Single field adjustment required: zero governor gas valve controls CO2 by a simple metric allen key setting.
Variable water flow heat exchanger accepts up to 10:1 range, minimizing piping costs.
Venting runs of up to 80 equivalent feet each, exhaust and air intake.
Low Fuel Usage/Emissions
Unrivaled heat retention: high mass cast iron heat exchanger with 5x the the wall thickness or copper holds heat energy longer.
State of the art HeatNet integral control provides user-friendly Multi-function monitoring of all boiler operations with intuitive diagnostics and easy to read text displays.
Down-fire design offers easy accessibility to all components for annual service and maintenance.
High Performance Engineering
88% combustion efficiency a full input. 99% combustion efficiency at minimum input (5:1 turndown).
Optimal fuel utilization and boiler performance thru integral HeatNet control module.
Low NOx and CO2 emissions - Reduces greenhouse gases.
Meets South Coast Air Quality Management Division (SCAQMD) Rule 1146.2 standards.
Made in the USA
Ultra efficient Tru-Flow symmetric air/fuel coupling design burns clean while insuring proper combustion at all firing rates.
5:1 continuous modulation for maximum efficiencies at all levels of heat demand.
Proven 8,000 btu pilot or "mini burner" with interrupted spark ignition and air-cooled UV sensor for enhanced reliability.
Low pressure drop thru the boiler does not require high velocities and allows good flow-balancing thru multiple boiler configurations with reverse-return piping.
Improve your boiler efficiency while cutting your outside air louver size by 70 to 80% while maintaining an ideal boiler room environment
| 400,000 BTUH|
| Gas pressure,|
| Voltage, 120 V|
| Flow, GPM||4||72|
| Temperature rise, F||20||100|
| Flue length, equiv. Ft.||0||100|
| Air inlet length, equiv. Ft.||0||100|
| Water volume, gals||4.5|
| Flue diameter, in||4"|
| Current, amps||5|
| Cv, GPM @ 1psid||30|
| Boiler HP||10.4|
| Input MBH||399|
| Output MBH||369|
| Fuel Type||Nat. Gas/LP|
| ASME Design Data Max||100PSI +250°F|
| Negative Flue Pressure||-0.2" W.C.|
| Positive Flue Pressure||0.25" W.C.|
| Height||51 7/8"|
| Width||35 3/8"|
| LBS.||638 lbs|
INTUITIVE and INTELLIGENT
The HeatNet integrated boiler control built into every KN can connect up to 16 units using only a
standard Ethernet cable: truly plug and play, with no external wall-mounted controls.
Use our interactive map of North America to find the sales rep servicing your area.