Mechanical Thermostat STELPRO SWT1C | Montreal, Laval, Longueuil, South Shore and North Shore

There are still places where an electronic thermostat is neither needed nor wanted: a garage, a heated shed, a storage room, a utility room, a workshop you rarely use, or simply a room where you would rather have a knob you turn. For these uses, the Stelpro SWT1C is a proven solution. This line-voltage mechanical thermostat controls electric heating units up to 22 A, from 120 to 277 VAC, with a dial marked in degrees Celsius. At AirGreen, we install it where simplicity and durability come first.

Mechanical simplicity for electric heating

A mechanical thermostat has no display, no battery and no electronics. You set the temperature by turning the dial, and the thermostat opens or closes the heating circuit based on the room temperature. This design makes it very tolerant of harsh environments, like a garage where the temperature swings a lot, and it does not depend on any configuration. It works as soon as it is installed, with no setup.

A 22 A capacity

The SWT1C is designed for 22 A from 120 to 277 VAC, with a 1/2 hp rating. That current capacity lets it control fairly powerful electric heating units, including in buildings supplied at 277 V. Before installation, our technicians check the voltage and current of the unit being controlled to confirm they stay within these ratings.

A practical temperature range

The dial covers a range of 10 to 30 °C. In a garage or shed, it is usually set at the low end of the range to keep the space mild without heating it like a living area. In an occupied room, you set it higher, depending on the comfort you want. Adjusting it is easy, with a simple turn of the dial.

Single-pole, 2-wire

The SWT1C is the single-pole, 2-wire version, in white. Stelpro also offers the SWT1CSW variant, single-pole in soft white, to blend in better with some decors, and the SWT2C, a double-pole, 4-wire model with an OFF position that lets you cut power to the unit completely. The choice between single-pole and double-pole depends on the existing wiring and your needs. Our technicians recommend the right variant for you.

Where to install it

The SWT1C suits attached or detached garages, heated sheds and storage rooms, utility and mechanical rooms, workshops, locker rooms and storage spaces. It is also popular in seasonal cottages, where you want a thermostat that works with no setup and no electronics sensitive to big temperature swings. Its 22 A capacity and compatibility up to 277 V also let it serve in some commercial and light industrial buildings.

Mechanical or electronic

Let's be clear about what a mechanical thermostat does. It is less precise than an electronic thermostat, like Stelpro's ST models, which hold the temperature within ±0.5 °C and offer an ECO mode or programming. In a bedroom or living room heated by baseboard heaters, an electronic thermostat is the best choice for comfort and energy use. The SWT1C belongs in secondary spaces, where durability and simplicity matter more than precision.

A clean look

The SWT1C stands out for its clean, simple look and compact dimensions: 74 mm wide, 116 mm high and 29 mm deep. It is easy to install and use, and temperature adjustment takes no effort.

Technical specifications

• Type: line-voltage mechanical thermostat
• Systems: line-voltage electric heating units
• Capacity: 22 A from 120 to 277 VAC; 1/2 hp
• Display: none (mechanical dial marked in °C)
• Setting range: 10 to 30 °C
• Configuration: single-pole, 2-wire
• Dimensions: 74 mm (W) × 116 mm (H) × 29 mm (D)
• Colour: white (SWT1C); soft white variant SWT1CSW
• Double-pole variant: SWT2C, 4-wire, with OFF position

Installation by AirGreen and tips for use

Even though it is a simple thermostat, installing a line-voltage thermostat is electrical work. Our qualified technicians shut off the circuit at the panel, confirm there is no voltage, then check the voltage and current of the unit being controlled. They also check the wiring: the single-pole SWT1C connects with two wires. If the installation calls for cutting power completely at the thermostat, we suggest the double-pole SWT2C instead. The thermostat is then mounted, power is restored and operation is checked by turning the dial.

We pay close attention to location. In a garage or workshop, the thermostat should not be exposed to direct airflow from the heater, a door that opens often or the sun. Otherwise, it would read a misleading temperature.

Saving energy in secondary spaces

In a garage, shed or storage room, the goal is rarely comfort. It is about protecting what is inside from extreme cold. Set the dial at the low end of the range and only turn it up when you are using the space. Remember to turn it back down when you leave: a mechanical thermostat will not do it for you. Good insulation on the door and walls of the heated space also goes a long way toward reducing energy use over the winter.

Maintenance

The SWT1C needs almost no maintenance. Dust it off now and then, especially in a workshop or garage where dust builds up. Keep the heater clean and clear, with no materials, tools or boxes stored in front of it, and check that it works in the fall, before the first deep cold.

Why AirGreen

AirGreen is a family-owned HVAC company with an RBQ licence, more than 15 years of experience and a showroom in Boucherville. For each space, we choose the most suitable control, whether mechanical, electronic or smart.

To buy the Stelpro SWT1C mechanical thermostat and have it professionally installed, contact AirGreen. We serve Montreal, Laval, Longueuil, the North Shore and the South Shore.

Stelpro documents

Stelpro spec sheet (PDF) · Stelpro installation guide (PDF)