With over a century of industry expertise, Preferred partners with you to reduce emissions and boost efficiency for a sustainable future. Our capabilities include fuel oil handling systems, boiler instrumentation and controls, remote monitoring, low- and ultra-low NOx burners, renewable and bio-fuel combustion, waste-fuel applications, and nuclear outage reduction tools,engineered to deliver reliability, compliance, and performance.
Hansol Electronics Co., Ltd.
HANSOL ELECTRONICS CO., LTD. is a leading Korean manufacturer specializing in premium heating, cooling, and air treatment appliances. We design, produce, and export a wide range of industrial portable air conditioners, dehumidifiers, and infrared heaters under our own brand “NEXKO.” We provide customized OEM/ODM services tailored to our partners’ market needs, and all products comply with global standards such as UL, CE, and RoHS.
Duravent Group
The Duravent Group brings together 14 trusted brands—including Duravent™, Hart & Cooley®, Selkirk®, AMPCO®, Heatfab®, Builder’s Best®, and more—supported by partnerships with RUTLAND, Menzies Metal, and PrimexVents. With a legacy of innovation and proven product performance, we offer a comprehensive portfolio of venting, chimney, air distribution, and dryer venting solutions. Backed by deep industry expertise and a team focused on results, we continue developing reliable products that meet the evolving needs of professionals and homeowners.
DryAir Manufacturing Corp
DryAir Manufacturing engineers and manufactures advanced hydronic solutions for industries that demand precision, efficiency, and reliability. Our modular, high-performance equipment supports a diverse range of applications, including Data center testing & commissioning, Boiler tie-ins & fluid heating, Chiller testing & commissioning, Industrial heating & cooling, Ground thaw, concrete curing & emergency heat. Our systems help businesses reduce fuel consumption, lower operating costs, and meet environmental goals.
Diversified Heat Transfer, Inc. (DHT)
Diversified Heat Transfer (DHT) is a leading engineering and manufacturing company of heat exchange equipment for residential, commercial, and industrial markets. With over 85 years of experience, DHT can design, build, and manufacture innovative, technology-driven products that provide flexible, high-quality, and cost-effective solutions for a wide variety of applications. In 2022 Sussman Electric Boilers became a brand of DHT, bringing with it a century-long legacy of specialized electric steam and hot water experience.