Mysa Baseboard 3: Overview and product specifications

Last updated: October 5, 2026

Baseboard 3 is Mysa's next-generation smart thermostat for compatible line-voltage electric heating.

At a glance

  • 120 V, 208 V, or 240 V AC

  • Maximum 16.7 A

  • Maximum 2,000 W at 120 V or 4,000 W at 240 V

  • Triac control for proportional heat output

  • 2.4 GHz Wi-Fi and Bluetooth setup

  • Matter support for Apple Home, Google Home, Amazon Alexa, SmartThings, and Home Assistant

  • Temperature and humidity sensing

  • Energy charting, Zones, Saved Schedules, Smart Alerts, adaptive brightness, and Wake on Approach

  • Cloud-based Smart Early-On and temperature offset

Compatible heating systems

  • Electric baseboard heaters

  • Electric convectors

  • Fan-forced convectors

  • Radiant ceiling heating

Baseboard 3 is not compatible with 24 V central HVAC or electric in-floor heating.

Controls and display

  • 5 × 7 LED matrix display

  • Capacitive up/down controls

  • Manual and adaptive display brightness

  • Wake on Approach

  • Hardware Lockout Options for controlling what can be changed at the thermostat

Sensors and readings

  • Ambient temperature and humidity

  • Current and voltage sensing

  • Instantaneous power

  • Light and proximity

Smart features in the Mysa app

  • Manual schedules, 9–5 schedule wizard, and My Routine schedule wizard

  • Saved Schedules

  • Home, Away, and Vacation shortcuts

  • Geofencing

  • Smart Early-On

  • Per-device and whole-home energy charting

  • Environmental Smart Alerts

  • Temperature offset

  • Zones

Smart-home control

Baseboard 3 is Matter certified. Complete setup in the Mysa app first, then use the Matter code from Menu → Home Assistants → Mysa Baseboard V3 to add the thermostat to a compatible platform.

Through Matter, supported controls include current temperature, heating setpoint, Heat/Off mode, voice control, and platform automations. Continue using the Mysa app for schedules, heater type, temperature offset, geofencing, zoning, and other Mysa features.

Certifications

  • CSA C-828

  • Matter

Baseboard 3 works with compatible Apple Home, Google Home, Amazon Alexa, SmartThings, and Home Assistant platforms through Matter. It does not use the older native smart-home certification and account-linking flow used by V2 and Lite.

Physical specifications

  • Model: MYSA BB V3-0

  • Dimensions: 5.7 × 3.9 × 1.9 in (144.78 × 98.28 × 47.71 mm)

  • Production firmware at launch: 5.1.4 or later

What is in the box

  • Mysa Smart Thermostat V3

  • 3 wire nuts

  • 2 mounting screws

  • User guide