Is Mysa for Baseboards Compatible With My Heating System?

Is Mysa for Baseboards Compatible With My Heating System?

Mysa for Baseboards works with most electric line-voltage heating systems. This guide helps you identify your system type and confirm compatibility.

Warning Working with high-voltage wiring can be dangerous. Check local building codes — some regions require a licensed electrician for line-voltage thermostat installation.

Quick Compatibility Check

Mysa for Baseboards is compatible if:

You have an existing wall thermostat (not a dial on the heater itself)

Your heating system runs on 120V or 240V (line voltage)

You have electric baseboard, convection, fan-forced, or radiant heaters

Your thermostat gang box has 4 or more wires (two bundles)

Use the Mysa Compatibility Checker for personalized guidance.

Do You Have a Wall Thermostat?

Mysa replaces an existing wall-mounted thermostat. If your heater has a dial or controls built into the unit itself, there's no thermostat gang box to install Mysa into.

Wall thermostat — Compatible A separate thermostat mounted on your wall that controls the heater.

Dial on the heater — Not compatible Controls built into the heater unit itself. Mysa requires a wall thermostat location.

High Voltage vs Low Voltage

Mysa for Baseboards works with high-voltage (line voltage) systems only. Here's how to tell:

High voltage (120V/240V) — Compatible Thick wires connected with wire nuts. This is what Mysa for Baseboards is designed for.

Low voltage (24V) — Not compatible Thin strands of wire that connect directly to the thermostat terminals. If you have this, you need Mysa Smart Thermostat instead.

Wiring Requirements

Mysa for Baseboards requires 4 or more wires in the gang box — typically two bundles of wires connected by wire nuts.

Why this matters: Mysa needs dedicated power to run its display and Wi-Fi. With two wire bundles, power flows in from your breaker (line) and out to your heater (load), allowing Mysa to power itself while controlling your heater.

Only see 2 wires? This is extremely rare. Remove the old thermostat faceplate and check inside the gang box — extra capped wires are often tucked inside. Most setups have 4–6 wires total.

If you truly only have 2 wires, the thermostat location only breaks the circuit and cannot power a smart thermostat. Contact us at install@getmysa.com to discuss options.

Wattage Limits

Mysa for Baseboards supports up to 16 amps, which translates to:

Voltage | Maximum Wattage | Calculation

120V | 1900W | 16A × 120V

240V | 3800W | 16A × 240V

This covers about 90% of home installations. If your heater exceeds 3800W at 240V (or 1900W at 120V), Mysa for Baseboards is not compatible.

To check your heater's wattage: Look at the rating plate on your heater — it lists both voltage and wattage.

Note Mysa for Baseboards - V2 requires a minimum 0.3A load for power monitoring. Mysa LITE for Baseboards has no minimum load requirement.

Compatible Heater Types

Electric Baseboard Heaters

Standard electric baseboards that heat by convection. Select Baseboard mode in the app.

Fan-Forced Heaters

Heaters with built-in fans, including toe kick heaters and wall-mounted fan heaters. Select Fan-forced mode in the app — this uses a longer duty cycle to protect the fan motor.

Radiant Heaters

Radiant ceiling heaters and similar systems. Select Radiant mode in the app — this uses on/off control that only activates when the room is 0.5°C (1°F) below the setpoint.

Convection Heaters

Electric convection heaters work the same as baseboards. Select Baseboard mode.

Not Compatible

Mysa for Baseboards does not work with:

Heaters with built-in controls — If your heater has a dial on the unit, there's no thermostat to replace

24V (low-voltage) systems — Use Mysa Smart Thermostat instead

Hydronic (water-based) baseboards — These require a boiler thermostat

Gas heaters — These need a gas-compatible thermostat

Three-phase or commercial 208V systems — Only single-phase 120V and 240V supported

2-wire only setups — Mysa requires 4+ wires for power (this is rare — check for tucked wires)

Multiple Heaters on One Circuit

You can control multiple heaters with one Mysa thermostat if:

Total combined wattage is under 3800W (at 240V) or 1900W (at 120V)

Total amperage is under 16A

All heaters are on the same circuit

Add up the wattage of all heaters to confirm you're within limits.

Single Pole vs Double Pole

Mysa for Baseboards is a single pole thermostat. It can replace:

Single pole thermostats — Direct replacement

Double pole thermostats — Works, but check local building codes (some regions require double pole for baseboard heaters)

Note A double pole thermostat disconnects both legs of a 240V circuit when off. A single pole thermostat disconnects only one leg. Both are safe, but regulations vary by region.

Get Support

Not sure if your system is compatible? Take a photo of your existing thermostat wiring and heater rating plate, then contact our team.

Email: install@getmysa.com