The short version: Mysa’s in-floor model is a dedicated smart thermostat for electric radiant floor heating — bathroom and kitchen tile mats, mostly — with a floor sensor, floor-temperature capping by flooring type, and the same HomeKit/Alexa/Google app that Mysa uses across its lineup. It’s a different product from Mysa’s baseboard thermostat, built specifically for floor-heating wiring and safety features (GFCI protection, floor temperature limits) rather than adapted from it.

Who It’s For

This model is built for electric in-floor (radiant) heating: the resistive heating mats or cables installed under tile, hardwood, or laminate floors, most commonly in bathrooms, kitchens, and basements. It does not work with hydronic (water-based) in-floor heating, and it doesn’t control a furnace, heat pump, or baseboard heater — Mysa sells separate models for those.

If you’re renovating a bathroom with a heated tile floor, or already have an electric floor-warming mat controlled by a basic thermostat, this is the product category.

Design & Build

Same design language as the rest of the Mysa line: a compact white unit with a circular LED display and a touch ring for manual adjustment. It mounts flush to a standard wall box and is small enough to fit cleanly next to a light switch in a bathroom.

Setup & Compatibility

Voltage and wattage: Works with 120V and 240V systems. Maximum rated load is roughly 3,800W at 240V or about 1,900W at 120V — enough for most residential bathroom or kitchen floor-heating installations, but check your mat’s wattage rating before buying if you’re heating a larger area.

Floor sensor: Comes with a 15-foot floor sensor that installs under the flooring during the mat installation. In the app, you select your flooring type (tile, hardwood, laminate, luxury vinyl, etc.), and the thermostat automatically caps the floor temperature at the manufacturer-recommended limit for that material, typically around 86°F. This is a genuine safety and floor-protection feature, not just a display number — it prevents overheating flooring that isn’t rated for high sustained temperatures.

Built-in GFCI: Includes Class A ground-fault protection, standard and expected for any thermostat controlling a wet-location circuit like a bathroom floor.

Not compatible with: hydronic (water-based) floor heating, or low-voltage systems like 12V/24V setups tied to a boiler or furnace.

Installation: Floor-heating installs typically happen during a renovation, when the mat and sensor go in before the new floor. If you’re retrofitting a thermostat onto an existing floor-heating system, the wiring itself is line-voltage work — turn off the breaker, verify with a voltage tester, and follow the app’s wiring walkthrough. Hire an electrician if you’re not confident with line-voltage wiring or your local code requires one for this kind of swap.

App & Ecosystem

Same core app as Mysa’s other thermostats: weekly scheduling, geofencing, and energy reporting in kWh with cost estimates. For floor heating specifically, the app adds the flooring-type selector and floor-temperature cap described above.

Smart home support:
– Apple HomeKit: Supported
– Google Assistant: Supported
– Amazon Alexa: Supported

No hub required — it connects directly to 2.4GHz Wi-Fi.

Buyer Feedback: What We Found

Independent, in-depth reviews specifically for Mysa’s in-floor model are thinner than for its baseboard sibling — it’s a lower-volume product sold mainly through home improvement retailers (Home Depot, Lowe’s, Best Buy) and Mysa’s own site rather than a widely reviewed category. Available retailer listings and product documentation confirm the floor-sensor and floor-temperature-capping features function as described. We didn’t find a meaningful volume of independent long-form reviews or forum discussion specific to this model, so treat pros and cons here as spec-grounded rather than backed by a large body of owner sentiment.

Price & Value

Mysa In-Floor Heating
Price (USD) ~$150–190
Warranty 2 years
Subscription None
Hub required No

This is a single-zone purchase in most homes (one bathroom, one thermostat), so the price is straightforward compared to a baseboard install spanning multiple rooms.

Pros & Cons

Pros:
– Purpose-built for electric floor heating, not a repurposed baseboard thermostat
– Automatic floor-temperature capping by flooring type protects the floor covering
– Built-in Class A GFCI, appropriate for bathroom/wet-location installs
– HomeKit, Alexa, and Google Assistant support with no hub
– Freeze protection and remote scheduling via the Mysa app

Cons:
– Limited independent review coverage compared to Mysa’s baseboard model
– Not compatible with hydronic (water-based) floor heating
– Wattage cap (~3,800W at 240V) may not cover larger multi-room floor-heating zones
– Requires the floor sensor to be installed during the flooring work, so it’s most practical as part of a renovation rather than a same-day swap

The Recommendation

Buy Mysa for In-Floor Heating if you’re installing or already have an electric radiant floor-heating mat and want app control, scheduling, and automatic floor-temperature protection. It’s the most straightforward option for this specific use case sold at US retail, though independent review volume is limited, so confirm your mat’s wattage against Mysa’s rated load before buying.

Frequently Asked Questions

Does Mysa’s in-floor thermostat work with hydronic (water) floor heating?
No. It’s built for electric resistive floor-heating mats and cables only, not water-based systems.

What’s the maximum wattage this thermostat can handle?
Roughly 3,800W at 240V or about 1,900W at 120V. Check your specific floor-heating mat’s wattage rating against this before buying.

Does it need a floor sensor?
Yes, one is included. The sensor installs under the flooring and lets the thermostat cap floor temperature based on the flooring type you select in the app, protecting the floor from overheating.

Can I use this for a kitchen or basement instead of a bathroom?
Yes, as long as the installation is electric floor heating within the wattage limit. Bathrooms are the most common use case, but it isn’t restricted to them.

Does this model require a hub?
No. It connects directly to your home Wi-Fi, same as Mysa’s other thermostats.

Is this the same thermostat as Mysa’s baseboard model?
No. It’s a separate product built specifically for floor heating, with a floor sensor and floor-temperature capping that the baseboard model doesn’t have.