Trusted since 1946, Russell manufactures a complete line of commercial refrigeration equipment and solutions—energy-efficient unit coolers, condensing units, condensers, air handlers, coils and packaged systems—to match any refrigeration requirement. Part of the Rheem family of brands. Join us in celebrating 75 years of innovation.

Quickly access valuable information and resources for Russell, Witt, Kramer and ColdZone product lines. Brand logos, sales flyers, product images, presentations, and more. Installation and Operations Manuals, Shipment Lookup, Equipment Inventory, Technical Data and more.

Heat Transfer Products Group (HTPG) designs, manufactures and markets energy-efficient commercial and industrial refrigeration equipment & system solutions sold under the trusted premium brands: Russell, Witt, Kramer, and ColdZone.

ColdZone delivers green refrigeration technologies and is the world’s leading manufacturer of refrigeration equipment—evaporators, compressor units, chillers, fluid coolers, and defrost controls—specifically designed for the foodservice and convenience store industries. Part of the Rheem family of brands.

Kramer, founded in 1914, is a leading manufacturer of energy efficient large refrigeration units, split systems, condensers and evaporators for the foodservice, food retail warehouse, industrial, and pharmaceutical industries. Kramer’s patented energy-saving technologies are recognized as the most efficient in the industry.

Since 1961, Witt has been a leading manufacturer of OEM commercial heat transfer equipment including unit coolers, air-cooled condensers, condensing units, air handlers and heat reclaim equipment. Part of the Rheem family of brands. Sometimes you just need a little help. Please check this section if you have questions.

Find the Htpg style guide with brand assets such as logos, colors, fonts, and more.

Our four brands have combined experience of over two centuries of refrigeration success. Each of our brands has the expertise to create unique refrigeration solutions for the markets they serve. Since 1946, contractors have trusted the Russell name for their commercial refrigeration projects.

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HTPG designs and manufactures heat transfer components and equipment for refrigeration applications in the food service, food retail and other non-consumable markets.