Indoor Products: Unit Heaters and Duct Furnaces

Sterling Unit Heaters and Duct Furnaces are a complete heat generating and distributing plant, equipped with automatic controls, and packaged in an attractive streamlined housing. Designed for ceiling mounting, they provide a convenient, low-cost method of heating stores, factories, warehouses and other large open areas comfortably.          Indoor Product Line >>

Self-Contained Rooftop Make-Up Air Unit

  • 4,501 - 10,000 CFM
  • Full Modulation 10:1
  • Operational to -30°F
  • 93% Operation Efficiencies
  • 800 - 1,200 MBH Heating Capacity
  • Exclusive Heat Loss Recovery System
  • High Efficiency Condensing Hydronic Heat Exchangers
More About the Xcelon Make-Up Air Unit ▶ Now Available!

A Leader in HVAC Innovation

Sterling has been an innovator in the HVAC industry since 1946 when we began producing finned-tube radiation in a rented garage in Westfield, Massachusetts. Today our modern 325,000 square foot manufacturing facility in North Carolina, USA now has the efficiency to produce both standard and custom product while providing short lead times. The independent representatives that work in partnership with Sterling are some of the best in their field and are strongly supported by a knowledgeable Sterling Technical Support staff.

Sterling unit heaters and parts are available from stock at many of the country's largest HVAC distributors.

Certified, Industrial Products

Sterling has been a major producer of CSA certified Gas Fired and Hydronic Unit Heaters for over 40 years. High and Low Intensity Infrared, Rooftop Duct Furnaces, Evaporative Cooling Units, Packaged HVAC Rooftop and Indoor Make-Up Air Units, and a full line of Industrial Products enhance Sterling's complete line of HVAC equipment.

Experienced Sales & Support

Sterling offers factory direct application specialists and local sales representatives to assist in the selection and applications of Sterling HVAC equipment. To contact your nearest Sterling representative, visit the Sales Reps section of this web site.

Engineer Specifier

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Made in the USA

Made in the USA
Sterling Gas Fired Unit Heaters, Hydronic Unit Heaters, Engineered Products and Direct Fired Products are proudly made in the USA