Electronic Thermostat STELPRO ST252NPFF 2500 W | Montreal, Laval, Longueuil, South Shore and North Shore

In many homes, the bathroom is where poor temperature control shows up first: too cold when you wake up, too hot once you're out of the shower. When that room is heated by a fan heater, the thermostat makes all the difference. The Stelpro ST252NPFF is a non-programmable electronic thermostat rated at 2500 W and designed for these units. It offers one-touch ECO mode, Boost mode for a quick temperature rise and Lobby mode, with the accuracy of thermistor-based control. At AirGreen, we recommend it for bathrooms, entrances and small rooms heated by a fan unit.

Fast, precise comfort with fan heaters

Thanks to its fan, a fan heater warms the air much faster than a baseboard heater. But the thermostat still has to know how to control it. The ST252NPFF uses a 3-wire connection, which lets it run the unit properly and offer Boost mode. When you turn it on, the temperature climbs quickly: the bathroom is comfortable in moments, and the entrance warms back up after the family gets home. Once the temperature is reached, the thermostat goes back to normal control.

ECO mode

ECO mode lowers the temperature with a single touch. In a bathroom, it keeps the room mild for the rest of the day, then lets you switch back to comfort when you need it. In an entrance, it turns the heat down during the hours when nobody comes through. It's a simple way to save without any programming.

Lobby mode

Lobby mode is designed for entrance halls and spaces people pass through. In a duplex, a triplex or a small building, it's a natural fit for shared entrances with a fan heater.

Accuracy and capacity

Thermistor sensing keeps the temperature within ±0.5 °C (1 °F) of the setpoint, over a range of 5 to 30 °C (41 to 86 °F). The digital display can be set to °C or °F. The thermostat runs on 120, 208 or 240 V and controls 150 to 1250 W at 120 V, 260 to 2160 W at 208 V and 300 to 2500 W at 240 V. That covers most wall-mounted fan heaters found in bathrooms and small rooms. It's certified to CSA C828-19 and housed in white moulded plastic.

Which rooms it's for

We install the ST252NPFF in bathrooms with a wall-mounted fan heater, in vestibules and home entrances, in laundry rooms and in some kitchens where there isn't enough wall space for a baseboard heater. It also works well in the shared entrances of plexes, where a fan unit quickly makes up for the cold air that comes in every time someone walks through. In all these cases, its 2500 W capacity at 240 V covers most installed units, and its three modes give occupants simple control over their comfort.

Compared with the other FF models

In Stelpro's FF series, the ST402NPFF offers the same features with a 4000 W capacity, for bigger units. The ST402PFF adds a programmable schedule with 4 periods on weekdays and 2 on weekends. The ST252NPFF is the logical choice for a lower-wattage fan heater when you'd rather have simple manual control. Note: for a baseboard heater or a convector without a fan, you need a thermostat from the standard NP series instead, such as the ST252NP.

Technical specifications

• Type: non-programmable line-voltage electronic thermostat for fan heaters
• Systems: electric fan heaters (3-wire)
• Voltage: 120/208/240 V
• Load range: 150 to 1250 W at 120 V; 260 to 2160 W at 208 V; 300 to 2500 W at 240 V (max. 2500 W at 240 V)
• Features: ECO mode (temperature setback), Boost mode (fast rise, 3-wire connection), Lobby mode
• Accuracy: ±0.5 °C (1 °F), thermistor sensing
• Setpoint: 5 to 30 °C (41 to 86 °F)
• Display: digital, °C or °F (your choice)
• Certification: CSA C828-19
• Colour: white, moulded plastic

Installation by AirGreen and practical tips

Our qualified technicians start by identifying the fan heater and noting its wattage, to confirm it falls within the ST252NPFF's range. Then they check the wiring at the thermostat box: this model needs a 3-wire connection. The circuit is shut off at the panel, we confirm there's no voltage, and the thermostat is wired and mounted. Once the power is back on, we test the heating, the fan and Boost mode, then show you how ECO mode works.

If the old thermostat was wired with only two wires, we assess the situation on site and go over your options with you before going any further.

Saving in the bathroom and the entrance

Bathrooms are often heated more than they need to be, all day long, for a few minutes of comfort in the morning and evening. With the ST252NPFF, a better approach is to keep the room in ECO mode and use Boost mode just before your shower. In the entrance, a moderate setpoint is enough, since warm air escapes every time the door opens. These small habits cut the energy use of rooms people often forget about when they look at their bill.

Maintenance

A fan heater's fan attracts dust and, in a bathroom, lint from towels. Clean the grille at the start of every heating season and whenever it looks dirty: a clean unit heats better, runs quieter and doesn't smell when it starts up. The thermostat itself only needs an occasional dusting.

Why AirGreen

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

To buy the Stelpro ST252NPFF 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 user guide (PDF)