Wattage & Amperage Limits

Your heater's wattage must stay within these limits for Mysa for Baseboards to operate safely.

Wattage limits by voltage

These limits cover roughly 90% of homes.

Multiple heaters on one circuit

You can control multiple heaters with one Mysa thermostat if:

• Total combined wattage is under the limit for your voltage (see table above)

• Total amperage is under 16A

• All heaters are on the same circuit

Add up the wattage of all heaters on the circuit to confirm you're within limits before buying.

Where to find your heater's wattage

Check the rating plate on the heater itself, usually stamped or printed on a metal label. If you can't find it, take a photo of the heater and your existing thermostat wiring and email install@getmysa.com — our team can help confirm.

Baseboard 3 (V3) limits are different

These limits apply to Mysa for Baseboards V1, V2, and Lite. Baseboard 3 (BB-V3-0) is rated for 4000 W at 240 V or 2000 W at 120 V (about 16.7 A), and can be installed on a breaker up to 30 A with 10 AWG wire.

Do not install V1, V2, or Lite on a 30 A circuit. If your circuit is 30 A, you need Baseboard 3 or another thermostat rated for that circuit. A 30 A breaker is not a wattage rating — the combined heater load must still stay within the wattage limit for your model.

Get Support

Email: install@getmysa.com