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Viessmann was founded in 1917 by Johann Viessmann in Hof an der Saale, Germany, as a small workshop specializing in the construction of steel boilers. In April 2023, Carrier Global acquired Viessmann's climate solutions division for €12 billion. Today, Viessmann operates 22 production facilities in 12 countries with more than 14,500 employees and €4 billion in annual revenue. Known for German engineering quality with stainless steel heat exchangers and lifetime warranties on residential Vitodens boilers.

Nationwide Boiler Inc. was founded in 1967 by Dick Bliss, who pioneered the mounting of package boilers on permanent, highway-legal trailers, creating an entirely new business segment. Headquartered in Fremont, California, the company has grown into a world-class rental boiler company and industry leader providing equipment to end-users on six of the seven continents. The company pioneered numerous industry firsts including the world's first and largest trailer-mounted boilers, ultra-low NOx rental boilers, and the CataStak™ SCR system for emissions reduction. In 2019, they acquired Pacific Combustion Engineering, rebranding it as Nationwide Control Solutions in 2022. Over 100 rental boilers in fleet and 250+ successful CataStak SCR installations.

Rite Engineering manufactures high-efficiency commercial and industrial boilers since 1952. Holds multiple patents.

Heat Exchangers

Patterson-Kelley is one of America's oldest commercial boiler and water heater manufacturers, founded in 1880 as Benjamin F. Kelley & Company. In 1917, Frank L. Patterson merged with Kelley to form Patterson-Kelley Company Incorporated. With over 140 years of experience, Patterson-Kelley has maintained its headquarters and manufacturing exclusively in East Stroudsburg, Pennsylvania. Now part of SPX Technologies. Known for their 'through the door' design philosophy and proprietary NURO Touch Screen Control System enabling remote monitoring via mobile app. Member of the U.S. Green Building Council.

Fire-Tube Boilers

Mexican boiler manufacturer since 1951, specializing in industrial steam boilers, hot water heaters, and thermal fluid systems.

Industrial watertube boiler manufacturer specializing in custom-engineered packaged and field-erected boilers for power generation, process steam, waste heat recovery.

New Yorker Boiler manufactures reliable residential hydronic-heating products. Complete line of cast iron and steel boilers for water and steam, plus indirect water heaters. Emphasizes safety, economy, and serviceability.

Manufacturer of fuel-fired and electric steam boilers for dry cleaning, food processing, medical sterilization, and health club steam room systems.

Manufacturer of industrial firetube steam and hot water boilers, serving commercial and industrial customers with custom-engineered solutions.

Utica Boilers is a historic American heating manufacturer founded in 1928 by Earle C. Reed in Utica, New York. Today under ECR International (part of TerraVest Industries of Canada). Known for sponsoring the famous Boilermaker Road Race since 1978.

Manufacturer of Peerless-branded residential and commercial cast iron and steel boilers, offering efficient hydronic heating solutions.

Precision Boilers specializes in electric steam boilers for commercial and industrial applications since 1948.

AERCO (Angelery Engineering Research Company) pioneered on-demand water heating in 1949. First commercial condensing/modulating boiler (1988). 163,000 sq ft facility with AHRI-accredited lab.

Heat Recovery Steam Generator

Manufacturer of industrial watertube boilers and HRSGs, providing custom-engineered solutions for power generation and process industries.

Sellers Manufacturing Company, based in Danville, Kentucky, has been producing commercial and industrial boilers since 1947.

Fire-Tube Boilers

Columbia Boiler Company of Pottstown, Pennsylvania, has been manufacturing steam and hot water boilers since 1888. Specializes in vertical tubeless boilers, HRT boilers, and low-pressure steam generators.

Fire-Tube Boilers

Turkish boiler and pressure vessel manufacturer founded in 1986. Produces heating boilers, steam boilers, thermal oil heaters with ISO 9001 and CE certifications.

Fire-Tube Boilers

Taiwan boiler specialist established 1978 with 40+ years experience. Once-through steam boilers, thermal oil heaters, fire-tube boilers. ISO-certified, exports across Southeast Asia.

Fire-Tube Boilers

Mexican industrial boiler manufacturer providing steam generation and thermal equipment for commercial and industrial applications in Latin America.

Dunkirk Radiator Corporation founded 1928 by Earle C. Reed. Nearly 100 years of American manufacturing. Still manufactures in original Dunkirk, NY facility.