KN’s advanced gas train design is responsive and completely adaptable. Tru-Flow Fuel/Air Coupling is a unique boiler control system developed to keep KN-Series cast iron boilers running cleanly and efficiently. By constantly monitoring and regulating the flow of both fuel and air, Tru-Flow can achieve an optimal 1:1 fuel mixture and is capable of automatic adjustments if the flow is compromised, ensuring continuous, safe and reliable operations. Working in conjunction with integrated HeatNet 3.0 boiler management system controls, Tru-Flow helps match load conditions with boiler output for optimal energy efficiency.

• Full burner modulation safely and accurately
• Burner efficiencies up to 99%

In an age where we are obligated to protect the environment for future generations: greener is better. There’s nothing greener than the KN-Series cast iron boilers. There is no other piece of equipment in the world as environmentally friendly as the KN-Series condensing cast iron boilers. As condensing boilers, the KN-Series units are constructed with a durable cast iron heat exchanger, enabling each unit to cycle longer and less frequently, as it retains latent heat longer and requires less energy to bring back to operating temperature. When coupled with the precise digital controls of HeatNet 3.0 boiler control software, KN-Series offer optimum efficiencies through full modulation.

The specially designed cast iron heat exchangers at the core of all KN-Series boilers are manufactured utilizing over 90% post-consumer recycled materials, which makes them completely recyclable! KN-Series condensing boilers are quiet and operate efficiently with low NOx and CO₂ levels.

In combination with custom-engineered, onboard boiler controls, KN-Series boilers' patented cast iron sections accommodate a wider range of piping and water flow conditions more so than any other material or technology on the market.

All KN-Series condensing boilers are capable of variable volume water flow up to 10:1 range and have low-pressure drops through the cast iron heat exchanger, and are also capable of delta T's of 20-100 with single pump system piping (reverse return) or primary/secondary piping. In direct comparison, competitive units typically have delta T's in the 20-40 range due to high-pressure drops and are not capable of single pump piping.

In addition to carrying a 25-year heat exchanger warranty, KN-Series boilers have virtually no inlet water temperature limitations making them the perfect condensing boiler unit for one of the fastest growing segments in the hydronic heating market: snow melt and radiant heating.