Advanced Thermal Hydronics

What Advanced Thermal Hydronics does

Advanced Thermal Hydronics (ATH) designs, manufactures, and distributes high-efficiency condensing cast iron commercial boilers under the KN-Series and KN-Series Plus brands, with output ranging from 200,000 to 4,000,000 BTUs at 90% to 96% AHRI-certified efficiency. Core technology centers on a time-tested cast iron heat exchanger (more than 90% post-consumer recycled material) combined with proprietary systems: the Tru-Flow symmetric air/fuel coupling design, the HEATNET 3.0 digital boiler management platform with lead/lag cascade control for up to 16 units, the HEATNET Online web-based remote monitoring service, and the Virtuoso₂ high-turndown control with Bosch O₂ sensor enabling a 10:1 turndown ratio. The company has more recently extended into ATH Inverter Air-to-Water Commercial Heat Pumps with Enhanced Vapor Injection (EVI) technology for electrified hydronic heating and cooling down to -20°F ambient. ATH operates as a wholly-owned subsidiary of Mestek, Inc., with corporate headquarters in Westfield, Massachusetts and a manufacturing facility in Boyertown, Pennsylvania.

ATH serves commercial and institutional customers across North America — including hotels (Westin Diplomat), airports (Dwight D. Eisenhower National), stadiums (BMO Field), museums (California Academy of Sciences), schools (Hunter Elementary), utilities (Springfield Municipal Light Plant), religious facilities, and real estate portfolios — through an exclusive manufacturer representative network rather than direct sales. The business model is primarily hardware sales of premium-priced cast iron boilers with a 25-year heat exchanger warranty, supplemented by free technical and application training delivered through The Reed Institute at the Westfield headquarters and on the road. Pricing is not publicly disclosed; customers are routed to local representatives for quotes. Certifications include LEED Qualified status and ASHRAE-approved cast iron material for condensing applications. Revenue, headcount growth rates, and detailed financials are not disclosed in available source material.

Name

Advanced Thermal Hydronics

Legal name

Advanced Thermal Hydronics

Website

https://knseries.com

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

51–100 employees

Short description

Advanced Thermal Hydronics, a Mestek subsidiary, manufactures high-efficiency condensing cast iron commercial boilers (KN-Series) and air-to-water heat pumps for North American commercial and institutional customers, sold exclusively through a manufacturer representative network.

Ownership category

akta.pro rank

Product category

Commercial Hydronic Boilers

NAICS

Power Boiler and Heat Exchanger Manufacturing (33241), Heating Equipment (except Warm Air Furnaces) Manufacturing (333414)

SIC

Heating Equipment, Except Electric & Warm Air Furnaces (3433), Fabricated Plate Work (Boiler Shops) (3443)

akta.pro primary industry

Boilers, Furnaces & Process Heating Equipment (IMAHAKAD)

Keywords

• Commercial condensing boilers
• Cast iron heat exchangers
• Hydronic heating systems
• Boiler management controls
• Commercial heat pumps

Headquarters

HQ city

Westfield

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Commercial Boiler Sales: Sale of KN-Series and KN-Series Plus condensing cast iron boilers to commercial customers including hotels, schools, hospitals, airports, and office buildings. Products range from 200,000 to 4,000,000 BTUs.
2. Training Services: Free technical and application training classes offered at corporate headquarters in Westfield, MA and on the road throughout North America through The Reed Institute. Technical Service Training and Application Training (earning 8 Professional Development Hours) are provided at no cost to attendees.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Advanced Thermal Hydronics (ATH) manufactures high-efficiency condensing cast iron commercial boilers (KN-Series and KN-Series Plus) ranging from 200,000 to 4,000,000 BTUs, along with commercial inverter air-to-water heat pumps. Products are built at the company's Boyertown, Pennsylvania manufacturing facility using proprietary cast iron heat exchangers and integrated with the HEATNET 3.0 boiler management control platform. ATH sells its products to commercial, institutional, and industrial customers through a North American manufacturer representative network.

Product overview

Advanced Thermal Hydronics offers a portfolio of commercial heating products built around its core KN-Series and KN-Series Plus condensing cast iron boilers, complemented by commercial inverter air-to-water heat pumps. The KN-Series provides high-efficiency (90%) condensing technology with cast iron construction ranging from 200,000 to 4,000,000 BTUs, while the KN-Series Plus delivers ultra-high efficiency (96%) for the same BTU range. All KN boilers feature integrated HEATNET 3.0 control platform with optional HEATNET Online remote monitoring and Virtuoso₂ high turndown controls (10:1 ratio). The product line also includes ATH commercial heat pumps with EVI technology for heating and cooling applications. Products are manufactured in Boyertown, PA with a 25-year heat exchanger warranty and are LEED qualified.

Differentiator

Problem solved

Functional benefit

Brands

• KN-Series: High efficiency condensing cast iron commercial boilers ranging from 200,000 to 4,000,000 BTUs. The only high-efficiency cast iron boilers available for the commercial marketplace that combine condensing gas-fired technology with cast iron construction strength and durability.
• KN-Series PLUS
• HEATNET
• HEATNET Online
• Virtuoso₂

Products and services

• KN-Series Condensing Boilers

Quantifiable outcome

• 18-20% annual fuel savings at Westin Diplomat Hotel
• +4 more outcomes

Named customers9 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

Feature7 records

Scale indicators4 records

Recent moves6 records

Expansion highlights4 records

Peers

• Lochinvar:

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/KNSeriesHVAC
• Facebookfacebook.com/KNSeries
• LinkedInlinkedin.com/company/kn-series

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Advanced Thermal Hydronics