UO3 Thermostat


A powerful and versatile choice, this thermostat works perfectly with most GeoStar systems — single or dual capacity units with ECM or PSC blower motors. Comfort Talk, text based output, and dual fuel capability are only a few of the features that make this thermostat a great partner for your geothermal system.

U03 Thermostat


Auto Changeover

Provides the option to automatically switch from heating to cooling with no effort.

Comfort Talk

Thermostat automatically translates Fault Flash codes to on-screen text for easy diagnosis.


Ability to regulate different temperatures for different days or times of day.

Dual Fuel

Thermostat automatically switches from geothermal to a supplemental heating source if needed.

Text Based

Current conditions and status messages are rendered on-screen in text.


Ability to gather additional data on indoor/outdoor temperature.


4.25” H x 6.25” W x 1.1”D
Download Owners Manual
Download Thermostat Product Line Brochure

Accessories available

TSU01 – Indoor surface mount sensor
TSU02 – Outdoor sensor
TSU03 – Indoor flush mount sensor

Suitable For

Single or dual capacity geothermal units with ECM or PSC blower motors.

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