Will it work with your system?
Works well with
- Baseboard and wall heaters
- Room-by-room electric heat
Check first if you have
- Furnaces, boilers and heat pumps (24 V)
- Loads above its rating
What it controls
The Cadet T521-W Line-Voltage Thermostat is a line-voltage for electric heat that runs at line voltage (240 V per the maker).
The listing doesn't state a maximum load. Don't install it until you've confirmed the rating covers your heaters' total watts. How to work out the load.
It's single pole. Single-pole models break one leg; the heater stays connected to the other.
Connectivity: Wired, so the schedule and setpoint can be changed from a phone.
Line voltage can kill: switch the breaker off and confirm it's dead before touching the wires, and use a licensed electrician if you're unsure. Line vs low voltage.
Also on the listing: dimensions of 8.75 in (D) x 4 in (W) x 2 in (H), a weight of 4.54 g and a analog.
Compatibility and specs
These come from the maker's listing for this exact model; the source of each is marked. Anything the maker leaves out is marked not stated.
| Model number | T521-W | Retailer |
|---|---|---|
| Model name | T521-W | Retailer |
| Dimensions (seller) | 8.75"D x 4"W x 2"H | Retailer |
| Works with | Dial | Retailer |
| Features (seller) | Temperature Control | Retailer |
| Connectivity | Wired | Retailer |
| Power | Corded Electric | Retailer |
| Voltage | 240 V | Retailer |
| Display | analog | Retailer |
| Mounting / installation | Wall Mount | Retailer |
| Max load | 24 W | Retailer |
| Material | Plastic | Retailer |
| Product weight | 4.54 g | Retailer |
| Schedule | non-programmable | Retailer |
| Poles | single pole | Retailer |
Strong points and weak points
Strong points
- single pole
- Wi-Fi control
- 240 V
Weak points
- Household-voltage wiring
- Max load not stated
- One thermostat per heater circuit
Wiring and install notes
- Compatibility statements are the maker's own. Confirm with the maker's compatibility checker, turn the power off before wiring, and leave line-voltage and furnace work to a licensed electrician or HVAC technician.
Thermostats to compare it with
FAQ
How many heaters can the Cadet T521-W Line-Voltage Thermostat control?
Can the Cadet T521-W Line-Voltage Thermostat run a furnace or heat pump?
Other line-voltage thermostats with similar wiring
- Honeywell Home CT410B Line-Voltage Thermostat
- Cadet T522-W Line-Voltage Thermostat
- Honeywell Home T410A1013 Line-Voltage Thermostat
- Honeywell Home RLV3120A1005 Line-Voltage Thermostat
All line-voltage thermostats in one grid · Every Cadet control listed
Our take
A fit for baseboard and wall heaters.
Where to get it
The link goes to this exact model's listing. Check that the box includes the trim plate or C-wire adapter you need, and confirm your wiring with the maker's compatibility checker before you order.
Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure