With HeatNet 3.0's full digital and remote monitoring capabilities, KN Series’ line of durable, condensing gas-fired cast iron boilers deliver intelligent, environmentally friendly, high-efficiency boiler solutions to meet the demands of today’s commercial boiler marketplace.



HeatNet 3.0 digital boiler management system...


All KN Series boilers by ATH have certified...


Exciting News! Condensing in Cast Iron is...


Interested in learning more? Contact your local sales representative and ask them how you can make KN Series by ATH work for you. Use the interactive Rep Locator to find the representative nearest you.


Maximize the performance of your KN Series condensing boiler system from the most experienced instructors in the industry. The Reed Institute provides hands-on training and live demonstrations for an array of HVAC applications – at no cost to you.


With a complete listing of performance-certified HVAC equipment and components, the EnergyGuide continues to be the leading source of energy-usage information today. How do KN Series condensing boilers stack up against the competition? See for yourself.