ATH – Hot Water Boilers
10:1 Turndown for KN-Series and KN-Series Plus
All ATH KN-Series boilers are available with the Virtuoso2 high turndown system. Working off the legendary Tru-Flow air/fuel coupling system, engineers at ATH have developed an air shutter-driven system expanding the KN’s turndown ratio to 10:1. The specially designed air shutter system is positioned between the venturi and the blower inlet. The air shutter opens and closes electronically at speeds dependent on the firing rate. The air shutter and blower protect against intake and flue pressure fluctuations by maintaining blower rpm. This provides complete combustion stability across the firing rate without sacrificing performance and reliability at any turndown ratio.
O2 Monitoring
Air density and temperature changes can affect boiler combustion. O2 sensors measure oxygen levels in the exhaust. The Virtuoso2 control platform incorporates a proven Bosch O2 sensor for real-time monitoring that can be instantly accessed by operators and technicians for instant adjustments for lower emissions and improved efficiencies.
Why is Cast Iron a Great Choice?
Cast iron is an ideal medium for condensing boiler applications due to its reliability and durability. Its corrosion-resistant properties make cast iron adverse to damage by acidic and basic pH levels. This casted metal is stronger than metals that are welded together. Set yourself apart on your next job with ATH KN-Series boilers.
Condensing, High Efficiency: 200,000 Btu
The Energy Star-rated KN2 cast iron boiler is ideally suited for residential and light commercial boiler applications, including new construction and retrofits. With a maximum output of 200,000 Btu and capable of modulating down to a 40,000-Btu minimum, the compact footprint of the KN2 makes this cast iron condensing boiler the ideal choice for hydronic space heat, radiant heat and snow-melting applications.
And don’t let its size fool you, the KN2 is built with the same quality, durability and levels of efficiency as the larger ATH KN-Series boilers. Constructed with the signature KN Series cast iron heat exchanger, the KN2 offers unrivaled heat retention, resulting in lower operating costs.
Features and Benefits That Come Standard
- 5x more wall thickness than stainless steel and aluminum
- Low NOx & CO2
- 90% AHRI-certified efficiency
- Accepts 10:1 range of water flows (variable volume systems)
- Tru-Flow Advanced Air/Fuel Delivery System
- 25-year heat exchanger warranty
- 100 psi maximum working pressure
- Assembled boilers use 80% post-consumer recycled materials
- LEED-qualified
- Plastic components are made from 40% post-consumer recycled materials
- Factory piped and wired
- HeatNet Control Platform with touchscreen
- Vent/intake runs of up to 80 equivalent feet
- Optional HeatNet Online Remote Monitoring
- Natural gas/LP gas/dual fuel
- 52″ x 29″ x 18″ HWD footprint
Condensing, High Efficiency: 400,000 Btu
Featuring large Delta Ts and fully modulating 400,000 Btu the KN4 cast iron boiler is the best condensing boiler unit to provide solutions to a multitude of challenges, including the growing radiant heat and snowmelt markets and other new construction and retrofit boiler applications.
KN4’s small vent size also allows the utilization of existing vent work as a chase for new equipment in retrofit applications. Its small footprint makes incorporating its power into new constructions as simple as ever. With 92.7% thermal efficiency at full input and 99% combustion efficiency at minimum input (5:1 turndown), the KN4 is a high-efficiency condensing gas-fired boiler option. Additionally, the durable cast iron engineering behind the KN Series, when coupled with HeatNet 3.0 boiler control technology, makes for efficient fuel utilization and increased boiler performance.
Features and Benefits
- Accepts 10:1 range of water flows (variable volume systems)
- 25-year heat exchanger warranty
- 5x more wall thickness than stainless steel and aluminum
- 90% AHRI-certified efficiency
- Tru-Flow Advanced Air/Fuel Delivery System
- 100 psi maximum working pressure
- LEED-qualified
- Assembled boilers use 80% post-consumer recycled materials
- Plastic components are made from 40% post-consumer recycled materials
- Vent/intake runs of up to 80 equivalent feet
- Factory piped and wired
- Optional HeatNet Online Remote Monitoring
- HeatNet Control Platform with touchscreen
- Low NOx & CO2
- Natural gas/LP gas/dual fuel
- 52” x 36” x 22” HWD footprint
Condensing, High Efficiency: 600,000 Btu
With 600,000 Btu in a compact footprint, the KN6 features a fully modulating, cast iron design and boasts increased condensing efficiency when compared to common condensing, gas-fired boilers. Built strong to handle the increasing demands of today’s commercial boiler applications, the KN6 is an ideal choice for boiler operations within corporate office facilities and educational centers.
Designed for increased boiler performance and longevity, the KN6 was engineered with an ultra-efficient Tru-Flow symmetric air/fuel coupling design that burns clean while ensuring proper combustion at all firing rates, as well as 5:1 modulation for maximum efficiencies at all levels of heat demand.
Features and Benefits
- 90% AHRI-certified efficiency
- 25-year heat exchanger warranty
- Optional 10:1 turndown
- 5x more wall thickness than stainless steel and aluminum
- Accepts 10:1 range of water flows (variable volume systems)
- 100 psi maximum working pressure
- Plastic components are made from 40% post-consumer recycled materials
- LEED-qualified
- Tru-Flow Advanced Air/Fuel Delivery System
- Assembled boilers use 80% post-consumer recycled materials
- Factory piped and wired
- Vent/intake runs of up to 80 equivalent feet
- Natural gas/LP gas/dual fuel
- Low NOx & CO2
- 72” x 36” x 43” HWD footprint
- HeatNet Control Platform with touchscreen
- Optional HeatNet Online Remote Monitoring
Condensing, High Efficiency: 1,000,000 Btu
Producing 1,000,000 Btu, the KN10 is engineered to meet the low fuel use, low installation cost and small footprint needs of today’s commercial boiler market. Like all ATH KN-Series boilers, the KN10 combines cast iron’s condition-tolerant and heat-retaining characteristics with full-modulating condensing boiler performance fuel savings.
The KN10 boasts 5:1 continuous modulation and can handle variable volume flows, resulting in one of the most flexible, innovative, and efficient boilers on the market.
Features and Benefits
- 72” x 36” x 50” HWD footprint
- Optional 10:1 turndown
- 5x more wall thickness than stainless steel and aluminum
- 90% AHRI-certified efficiency
- 100 psi maximum working pressure
- Tru-Flow Advanced Air/Fuel Delivery System
- 25-year heat exchanger warranty
- Accepts 10:1 range of water flows (variable volume systems)
- Plastic components are made from 40% post-consumer recycled materials
- LEED-qualified
- Assembled boilers use 80% post-consumer recycled materials
- Vent/intake runs of up to 80 equivalent feet
- HeatNet Control Platform with touchscreen
- Factory piped and wired
- Natural gas/LP gas/dual fuel
- Low NOx & CO2
Condensing, High Efficiency: 1,600,000 Btu
The KN16 produces 1,600,000 Btu while maintaining the features that have made KN Series boilers the most recognized line of condensing, gas-fired boilers in the commercial boiler industry; long-lasting durability and ultra-high condensing efficiencies, all in a compact footprint.
Capable of rising to the challenge of any commercial boiler application, the KN16 was engineered on the solid foundation of a high-efficiency, condensing boiler with a cast-iron heat exchanger. Paired with the state-of-the-art HeatNet 3.0 boiler control platform, Tru-Flow “whirlwind” blower and gas valve package that replace traditional VFDs, the KN16 delivers pinpoint modulation, ensuring maximum performance at any firing rate.
Features and Benefits
- 72” x 35” x 60” HWD footprint
- Natural gas/LP gas/dual fuel
- Low NOx & CO2
- HeatNet Control Platform with touchscreen
- Optional HeatNet Online Remote Monitoring
- Factory piped and wired
- Vent/intake runs of up to 80 equivalent feet
- LEED-qualified
- Assembled boilers use 80% post-consumer recycled materials
- Plastic components are made from 40% post-consumer recycled materials
- 100 psi maximum working pressure
- Tru-Flow Advanced Air/Fuel Delivery System
- Accepts 10:1 range of water flows (variable volume systems)
- 5x more wall thickness than stainless steel and aluminum
- 90% AHRI-certified efficiency
- 25-year heat exchanger warranty
- Optional 10:1 turndown
Condensing, High Efficiency: 2,000,000 Btu
With an output of 2,000,000 Btu, the KN20 is built to withstand any harsh environmental conditions that come its way. Engineered with the signature KN Series cast iron heat exchanger and full-modulation condensing boiler performance, the KN20’s durability and reliability are second to none.
The KN20 enables low installation cost alongside optimal fuel utilization in a small footprint regardless of the boiler application size. When integrated with HeatNet 3.0 boiler control software, the KN20 can be used in conjunction with other KN Series boilers in a master/member network of up to 16 units and other units using HeatNet 3.0 software, creating a custom boiler network to meet the heating demands of the most extensive commercial boiler operations.
Features and Benefits
- 72” x 35” x 67” HWD footprint
- Optional 10:1 turndown
- Plastic components are made from 40% post-consumer recycled materials
- LEED-qualified
- HeatNet Control Platform with touchscreen
- Optional HeatNet Online Remote Monitoring
- Natural gas/LP gas/dual fuel
- Factory piped and wired
- Vent/intake runs of up to 80 equivalent feet
- Low NOx & CO2
- Tru-Flow Advanced Air/Fuel Delivery System
- Assembled boilers use 80% post-consumer recycled materials
- 5x more wall thickness than stainless steel and aluminum
- 90% AHRI-certified efficiency
- Accepts 10:1 range of water flows (variable volume systems)
- 100 psi maximum working pressure
- 25-year heat exchanger warranty
Condensing, High Efficiency: 2,600,000 Btu
The KN26 continues the ATH KN-Series boilers’ tradition of excellence with its cast-iron heat exchanger and full-modulation capabilities. Producing 2,600,000 Btu within such a reduced footprint makes the KN26 a versatile condensing gas-fired boiler sized to meet the most demanding operations within the commercial boiler industry.
From single boiler applications to multiple boiler master/member networks controlled by HeatNet 3.0 software, the KN26 is built for the long haul. Developed for maximum efficiency, the KN26’s cast iron heat exchanger retains heat longer, allowing for shorter cycling and, most importantly, lower operating expenses.
Features and Benefits
- 72” x 35” x 78” HWD footprint
- 90% AHRI-certified efficiency
- 25-year heat exchanger warranty
- Optional 10:1 turndown
- Accepts 10:1 range of water flows (variable volume systems)
- 100 PSI maximum working pressure
- 5x more wall thickness than stainless steel and aluminum
- Plastic components are made from 40% post-consumer recycled materials
- LEED-qualified
- Tru-Flow Advanced Air/Fuel Delivery System
- Assembled boilers use 80% post-consumer recycled materials
- Factory piped and wired
- Optional HeatNet Online Remote Monitoring
- Natural gas/LP gas/dual fuel
- Vent/intake runs of up to 80 equivalent feet
- HeatNet Control Platform with touchscreen
Condensing, High Efficiency: 3,000,000 Btu
At 3,000,000 Btu, the KN30 is the largest boiler in the KN Series line. Without sacrificing reliability for size, the KN30 is designed to conquer the most significant, most challenging demands of the modern commercial boiler market, using a historical favorite, cast iron.
Condition-tolerant and heat-retentive, cast iron heat exchangers make the KN30 stronger and allow for short cycling, reducing boiler installation and operation costs over its lifetime. And when paired with full-modulation capabilities and HeatNet 3.0 boiler control software, the KN30’s high-efficiency condensing boiler technology continues to exceed industry standards and expectations.
Features and Benefits
- 25-year heat exchanger warranty
- Optional 10:1 turndown
- Accepts 10:1 range of water flows (variable volume systems)
- 72” x 35” x 86” HWD footprint
- 5x more wall thickness than stainless steel and aluminum
- 90% AHRI-certified efficiency
- HeatNet Control Platform with touchscreen
- Optional HeatNet Online Remote Monitoring
- Low NOx & CO2
- Natural gas/LP gas/dual fuel
- LEED-qualified
- Factory piped and wired
- Vent/intake runs of up to 80 equivalent feet
- Assembled boilers use 80% post-consumer recycled materials
- Plastic components are made from 40% post-consumer recycled materials
- 100 psi maximum working pressure
- Tru-Flow Advanced Air/Fuel Delivery System
In a commercial market where efficiency is everything, the KN-Series stands out among the crowd as the only high efficiency, cast iron line of boilers to combine condensing gas-fired technology, with the strength, durability, and heat retention of cast iron construction. Durable, rugged and long-lasting, cast iron is the ideal material for condensing boiler systems that are built to last the long haul.
Facts:
- Industry’s best 25-year heat exchanger warranty
- KN-Series boilers have an installation base of over 26,000 units since their introduction
- KN-Series boilers have not had one documented failure associated with corrosion
- Cast iron is an acceptable material for use in condensing boiler applications by ASHRAE
- Cast iron has been the material of choice in the boiler industry for over 150 years
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