Dayton
Dayton 3UG91 2-pole baseboard heater thermostat 120-277V
A 2-pole mechanical dial thermostat for residential baseboard heaters, rated 18/22A across 120/208/240/277V AC with a 40-100°F control range
- Mechanical dial gives simple temperature control
- 40 to 100 degrees F range covers typical comfort needs
- 2-pole design switches both lines for safety
- 18 to 22 amp rating handles standard baseboard heaters
- 120 to 277 volt compatibility fits most residential circuits
Dayton 3UG91 Baseboard Thermostat
The Dayton 3UG91 is a mechanical dial thermostat designed for residential electric baseboard heaters. It mounts directly on the heater unit and provides manual temperature control from 40 to 100 degrees Fahrenheit. The two-pole switch interrupts both hot legs for safer servicing.
Replacing Single-Pole or Failed Units
This thermostat upgrades installations that previously used a single-pole control by breaking both supply conductors when turned off. The change is worth it when local code requires double-pole disconnection or when the original dial has lost calibration. It also replaces any failed 22-amp rated mechanical stat.
22-Amp Capacity at 120-277 Volts
The contacts handle 22 amps at 120, 208, 240 or 277 volts AC, covering standard North American residential and light commercial voltages. It comfortably runs typical baseboard loads up to the full 22-amp rating. The mechanical dial offers no programming or remote features, so it cannot support scheduled setback or smart-home integration.
Highlights
- Mechanical dial gives simple temperature control
- 40 to 100 degrees F range covers typical comfort needs
- 2-pole design switches both lines for safety
- 18 to 22 amp rating handles standard baseboard heaters
- 120 to 277 volt compatibility fits most residential circuits
Specifications
| Brand | DAYTON |
|---|
Questions about this item
What wall-box depth and screw spacing does the 3UG91 unit-mount base require?
The thermostat mounts directly to the heater chassis using the unit-mount tabs; no separate wall box is needed.
Which wires connect to the two poles on the 22 A / 120-277 V contacts during installation?
Connect both line conductors to the two screw terminals — one per pole — so the mechanical dial interrupts both legs of the circuit.
When should the mechanical selector dial be replaced if it no longer holds the 40-100 °F set-point?
Replace the thermostat if the dial slips or the contacts fail to open and close reliably at the chosen temperature.
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