Line-voltage smart thermostat (120–240 V)
Mysa Smart Thermostat for Electric Baseboard Heaters
A line-voltage smart thermostat for electric baseboard and fan-forced heaters, rated 16 A — 3,800 W at 240 V — with schedules, geofencing and energy charts, and no subscription.
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Best for
One room of electric baseboard heat, replacing a dial or basic line-voltage thermostat
Specifications
| Systems | Line voltage 120–240 VAC: electric baseboard and fan-forced heaters |
|---|---|
| Max load | 16 A — 1,900 W at 120 V, 3,800 W at 240 V, for all heaters on the thermostat combined |
| Min load | 250 W |
| Circuit | Install on a 20 A breaker |
| Wiring | Needs a neutral or L2 wire (3–4 wires); single-pole internally |
| Features | Schedules, geofencing, humidity sensor (±2%), energy charts and monthly report |
| Works with | Apple HomeKit, Alexa, Google Home; Wi-Fi 2.4 GHz |
| Certification | UL 60730 |
| Subscription | None |
| Warranty | 5-year coverage |
Specifications as published by Mysa. Confirm against the current spec sheet before buying — manufacturers revise models without renaming them.
What's good
- Built for line voltage — the only kind of thermostat that is safe on a baseboard heater
- Tight electronic control instead of a dial's wide swings, which our baseboard guide credits with less overshoot
- Per-room schedules make baseboard heat's real advantage — heat only the rooms in use — automatic
- No subscription, ever, per Mysa
What's not
- Not for low-voltage (24 V) furnaces, central air or heat pumps, millivolt gas fireplaces, boilers or electric in-floor heat
- Needs a neutral or L2 wire at the box, and the heaters on it must total 250–3,800 W at 240 V
- Line-voltage wiring: if you aren't comfortable working on a 240 V circuit, have an electrician fit it
Our verdict
For baseboard heat, this is the upgrade our guide describes: an electronic line-voltage thermostat that holds a narrow band and can set back unused rooms on a schedule. Check two things first — that the wall box has a neutral or L2 wire, and that the heaters it will switch add up to no more than 3,800 W at 240 V (1,900 W at 120 V).
Compare with the alternatives
- ecobee Smart Thermostat Premium — a heat pump with electric backup, especially in a house where the thermostat's room isn't representative
- Google Nest Learning Thermostat (4th gen) — a heat pump home without a c wire that wants a remote sensor
- ecobee Smart Thermostat Enhanced — a heat pump with a single stage of backup heat, on a budget