Electronic Thermostat STELPRO ST302NP 3000 W | Montreal, Laval, Longueuil, South Shore and North Shore

When a home heated with baseboards switches from old mechanical thermostats to electronic ones, the 3000 W capacity is often the one that comes up most on the list of rooms. The Stelpro ST302NP covers this common need. This non-programmable electronic thermostat for electric baseboard heaters and convectors combines precise control, a one-touch ECO mode and a simple 2-wire installation on the S3 plate. At AirGreen, it's one of the models we install most often when we replace all the thermostats in a house.

Replacing mechanical thermostats, room by room

A mechanical thermostat with a bimetallic strip reacts slowly and lets the temperature drift. You set it to 21, the room climbs to 23, drops back to 19, then climbs again. Those swings mean discomfort and more consumption than necessary. The ST302NP measures the temperature with a thermistor and holds it within ±0.5 °C (1 °F) of the set point. According to Stelpro, this added precision can bring up to 12% in energy savings, based on an independent study. Multiplied by the number of rooms in a house, the replacement quickly becomes an easy project to justify.

A versatile capacity

The ST302NP runs on 120, 208 or 240 V. It controls 150 to 1500 W at 120 V, 260 to 2600 W at 208 V and 300 to 3000 W at 240 V. That range covers most medium-sized living rooms, kitchens, master bedrooms and family rooms. For smaller or larger rooms, the ST202NP, ST252NP and ST402NP models round out the lineup, and the ST302P offers a programmable version.

ECO mode, day to day

ECO mode lowers the temperature with a single button. It's a way to save that takes zero learning: you turn it on when you go to bed or head out, and turn it off when you get back. For people who don't want a programmed schedule, or whose schedule changes from one week to the next, it's often the most realistic way to cut consumption.

A clear display, a consistent look

The digital display shows the temperature in °C or °F, your choice. The set point range is 5 to 30 °C (41 to 86 °F). The white moulded plastic casing is identical to the other non-programmable models in the lineup, so you can replace every thermostat in a house and keep a uniform look, even when each room gets the capacity it needs.

A solid mount, a CSA-certified thermostat

It connects with 2 wires, like most existing baseboard thermostats. Stelpro's S3 mounting plate makes mounting easier, holds firmly and protects the connections. The thermostat is certified to CSA C828-19, the Canadian performance standard for electric heating thermostats.

Who it's for

The ST302NP suits homeowners who want to modernize their electric heating at a lower cost, plex owners replacing the thermostats in several units, and people who prefer controls without programming. In a rental unit, its simplicity cuts down on tenant questions, and its precision helps keep consumption in check.

Technical specifications

• Type: non-programmable electronic line-voltage thermostat
• Systems: electric baseboard heaters and convectors (2-wire)
• Voltage: 120/208/240 V
• Load range: 150 to 1500 W at 120 V; 260 to 2600 W at 208 V; 300 to 3000 W at 240 V (max. 3000 W at 240 V)
• Display: digital, °C or °F (selectable)
• Accuracy: ±0.5 °C (1 °F), thermistor sensing
• Set point: 5 to 30 °C (41 to 86 °F)
• Function: one-touch ECO mode (temperature setback)
• Connection: 2-wire; S3 mounting plate
• Savings: up to 12% according to Stelpro (independent study)
• Certification: CSA C828-19
• Colour: white, moulded plastic

A full replacement planned by AirGreen

When we replace the thermostats in a house, we work methodically. Our qualified technicians first go room by room to note the wattage of the baseboard heaters connected to each thermostat. They then match each room with the Stelpro model of the right capacity: the ST302NP for loads up to 3000 W at 240 V, a smaller or larger model elsewhere. On installation day, each circuit is shut off at the panel, the absence of voltage is confirmed, the S3 plate is mounted and the thermostat is connected. Once the power is back on, every room is tested.

This approach avoids two common mistakes: installing a thermostat that's too small for the load, or putting in mismatched models that make day-to-day use harder.

Saving through the Quebec winter

With electronic thermostats in every room, a few habits are enough to lower the bill. Turn on ECO mode in the bedrooms during the day and in the living spaces at night. Close the doors of unused rooms and leave their thermostats in ECO mode. Avoid setting the thermostat to the max to heat faster. If your home also has a wall-mounted heat pump, set the baseboards in the same zone a little lower, so the heat pump does most of the heating.

Maintenance

The thermostat only needs a yearly dusting. The baseboard heaters, on the other hand, collect dust, which can give off a smell the first time they come on in the fall: a good cleaning before the heating season takes care of that. Keep the baseboards clear of furniture and curtains. If a thermostat shows a temperature that doesn't seem right, check that it isn't in direct sunlight or near a heat source, like a lamp or an electronic device, before contacting us.

Why AirGreen

AirGreen is a family-owned HVAC company with more than 15 years of experience, an RBQ licence and a showroom in Boucherville. We modernize electric heating and install wall-mounted and central heat pumps, so we can advise you on your whole heating system.

To buy the Stelpro ST302NP thermostat and have it professionally installed, contact AirGreen. We work in Montreal, Laval, Longueuil, the North Shore and the South Shore.

Stelpro documents

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