Sterling High-Efficiency Unit Heaters

BioTherm is proud to announce our new OEM relationship with Sterling to bring you a great option for your unit heater investment!

Available in multiple sizes, these heaters are designed to fit facilities of any size, are competitively priced, and offer greater efficiency than other models on the market.

Call 1-800-GET-HEAT to order!

Additional information

We offer a unit heater model for every size facility, designed to match the same models currently available on the market while providing enhanced efficiency and competitive pricing.

BioTherm is now offering the highest-efficiency unit heaters on the market!

  • Separated combustion is standard
  • Available with two-stage full modulating fire
  • 10 year warranty on all Sterling units
  • All units are made in USA


GG Series
82% Thermal Efficiency
Size Range: 30-120 MBTUH
NG/LP Compatibility


XF/XC Series
83% Thermal Efficiency
Size Range: 100-400 MBTUH
NG/LP Compatibility


Matrix Series – HIGHEST EFFICIENCY
93% Thermal Efficiency
Size Range: 50-400 MBTUH
Gas-Fired, Condensing Unit Heater

How it Works

Sterling unit heaters use a high-efficiency heat exchanger and forced air system to deliver consistent, evenly distributed warmth throughout the greenhouse. The unit draws in cooler air, heats it, and circulates it using a powerful fan, ensuring quick and reliable temperature control. When paired with a root zone heating system, the forced air maintains ambient warmth while the root zone heat targets plant roots, creating a balanced and efficient growing environment.

Why Buy Sterling?

Sterling unit heaters are the most efficient on the market, offering powerful and reliable heating designed specifically for greenhouse environments. Their forced air system integrates seamlessly with root zone heating for complete climate control and optimal plant growth.

Unmatched Efficiency

Sterling unit heaters are the most efficient on the market, delivering powerful, cost-effective heating for greenhouses of all sizes

Enhanced Climate Control

When paired with a root zone heating system, Sterling’s forced air provides complete climate control by maintaining ambient warmth while optimizing root zone temperatures

Built for Greenhouses

Designed for durability and reliability, Sterling unit heaters are ideal for greenhouse environments, offering consistent performance in even the most demanding conditions

Frequently Bought Together

Benefits & Features

Hear From

Our Happy Clients

Select from a wide range of high-quality coffee machines tailored to your office size and needs.

Fully Integrated Climate
Systems for Indoor Environments

With over 44 years of unparalleled experience, BioTherm has been at the forefront of revolutionizing greenhouse climate technologies. Our mission is to empower growers to craft their own ideal weather, fostering the perfect ecosystem for plants to not only grow but thrive.

Let’s Grow Together

With over 44 years of unparalleled experience, BioTherm has been at the forefront of revolutionizing greenhouse climate technology. Our mission is to empower growers to craft their own ideal weather, fostering the perfect ecosystem for plants to thrive.