01 / Your system comes first
Three different jobs. Different controls.
24 V heating & cooling
Compatible furnaces, air conditioners and heat pumps. Check equipment stages, control wiring and C-wire requirements.
Compare HVAC modelsLine-voltage electric heat
Supported 120–240 V baseboard, convector or fan-forced heaters. Match voltage, load, wiring and wall-box fit.
Check the US electric modelWater-based heating
Boiler controls, underfloor actuators and radiator valves have different jobs. Region and control interface matter.
Understand the distinctions02 / Compare the fit
Choose within your system type.
Four 24 V HVAC options and one line-voltage electric-heating option, with their differences made explicit. These comparisons draw on manufacturer documentation; we have not performed hands-on testing.
24 V HVAC · configure the equipment first
Meross MTS300MA
A Wi-Fi thermostat for compatible North American heating and cooling systems. Choose it after checking your HVAC configuration and power supply, not simply because your existing thermostat looks similar.
- Power & system
- 24 V AC / 50–60 Hz · 1 A maximum output
- Connection
- Matter over 2.4 GHz Wi-Fi
- Linked model / package
- Amazon: MTS300 White · one thermostat · C-wire adapter not included. Meross store: MTS300MA-US.
What your setup needs
- A C wire or compatible power arrangement is required. Use Meross’s system checker and have an HVAC professional confirm the installation.
- The Meross app is required for initial HVAC configuration. Matter setup alone does not configure the heating and cooling equipment.
- A compatible Matter controller for your chosen platform; advanced scheduling and energy features may remain in the Meross app.
Check before choosing
Not a 120–240 V electric-baseboard thermostat. Meross recommends this housing and model for North America, not Europe.
Amazon: MTS300 White · one thermostat · C-wire adapter not included. Meross store: MTS300MA-US.
Confirm the exact model, finish, accessories and current terms at the retailer.
View model details →
24 V HVAC · learning schedules and a room sensor
Nest Learning Thermostat (4th gen)
A thermostat with learning schedules and a separate room-temperature sensor. Google’s compatibility checker is the starting point for your system, including multi-stage equipment and any power accessories.
- Power & system
- Compatible 24 V HVAC · C-wire needs vary
- Connection
- Matter over Wi-Fi · 2.4 / 5 GHz
- Linked model / package
- Polished Silver · thermostat + one 2nd-gen Nest Temperature Sensor
What your setup needs
- Check the exact HVAC system with Google. This model can work without a C wire in many installations; some need a C wire or Nest Power Connector.
- Google’s version 2.4 update, dated April 30, 2026, adds on-device setup and Matter bridging for thermostat sensors. Check the installed firmware and your platform’s support.
- Your chosen third-party Matter platform may require its own controller. Advanced Nest settings and learning behavior are not identical in every Matter app.
Check before choosing
The linked offer is Polished Silver with a 2nd-gen sensor. Obsidian and Gold are different finishes; the 2020 Nest Thermostat and earlier Learning generations are different products.
Polished Silver · thermostat + one 2nd-gen Nest Temperature Sensor
Confirm the exact model, finish, accessories and current terms at the retailer.
View model details →
24 V HVAC · scheduled temperature control
Nest Thermostat (2020)
The non-Learning Nest Thermostat uses a programmed schedule. Its system support and accessory requirements differ from the 4th-gen Learning model, so compare the exact model before deciding.
- Power & system
- Compatible 24 V HVAC · 20–30 V AC supply
- Connection
- Matter over Wi-Fi · 2.4 / 5 GHz
- Linked model / package
- Snow · Nest Thermostat (2020)
What your setup needs
- Check heating/cooling stages with Google. Some systems, including heating-only, cooling-only, zoned and heat-pump configurations, need a C wire or Nest Power Connector.
- Matter support arrived in firmware 1.3–10 in June 2023. Check that the unit is updated; Google lists later maintenance releases.
- Google Home is used for setup and remote features. Check the Matter controller requirements for other platforms.
Check before choosing
This is not the Nest Learning Thermostat and does not include the Learning model’s remote sensor bundle. Confirm the Snow finish and included parts at checkout.
Snow · Nest Thermostat (2020)
Confirm the exact model, finish, accessories and current terms at the retailer.
View model details →24 V HVAC · check the exact X2S model
Honeywell Home X2S (RTH2SMC/N)
A Wi-Fi wall thermostat for compatible heating and cooling systems. The manufacturer manual includes base model RTH2SMC; the reviewed Amazon listing identifies RTH2SMC/N in White.
- Power & system
- 24 V AC · C wire required
- Connection
- Matter over Wi-Fi · 2.4 / 5 GHz
- Linked model / package
- X2S RTH2SMC/N · White
What your setup needs
- Have the exact HVAC stages and power arrangement checked against the RTH2SMC manual. This model is not for 120–240 V electric-baseboard heaters.
- The reviewed manual uses the First Alert by Resideo app for configuration. Check current app and firmware instructions and your platform’s Matter controller requirements.
- The manual excludes external sensor inputs and accessory relay outputs for this model. Do not borrow accessory support from other Honeywell Home thermostats.
Check before choosing
FocusPRO S200 and RTH2CWF are different variants. The catalog’s historical S200 / X2S family certificate has not been independently matched to this exact retail SKU.
X2S RTH2SMC/N · White
Confirm the exact model, finish, accessories and current terms at the retailer.
View model details →
Manufacturer illustration · phone not included
120–240 V electric heating · a different electrical system
Meross MTS215MA US
For compatible electric baseboard, convector and fan-forced heating. This US model switches line-voltage heating loads; it is not interchangeable with a 24 V thermostat or the European MTS215B boiler control.
- Power & system
- 120–240 V AC / 50–60 Hz · 16 A maximum
- Connection
- Matter over 2.4 GHz Wi-Fi
- Linked model / package
- MTS215MA US · one thermostat
What your setup needs
- Manufacturer output limits: 1,920 W at 120 V or 3,840 W at 240 V. Have an electrician confirm the load, wiring and wall-box fit.
- Use the manufacturer’s compatibility checker and exact US manual. Do not infer wiring requirements from the 24 V MTS300 or European MTS215 variants.
- A compatible Matter controller for your platform. App scheduling and energy-monitoring features do not imply the same functionality through every Matter platform.
Check before choosing
Not for 24 V HVAC, heat pumps or conventional air conditioning. Meross recommends the US housing for North America, not Europe; do not assume all radiant or underfloor systems are compatible. Manufacturer-claimed Matter support is documented, but the catalog’s retained CSA certificate covers European electric underfloor heating and does not verify this US model.
MTS215MA US · one thermostat
Confirm the exact model, finish, accessories and current terms at the retailer.
View model details →The line-voltage MTS215MA US serves a different system and is shown separately above.
03 / Keep model families separate
More models, with requirements to confirm.
These regional references still need an exact retail match before becoming a buying recommendation.
Regional wall controls and radiator valves are separate
Eve Thermostat & Eve Thermo
Eve Thermo is a radiator valve. Eve Thermostat’s European model is a wall control for compatible water-based underfloor heating, using Thread and a compatible Matter controller / Thread border router. Eve’s US page currently describes its North American Thermostat as coming soon.
A European 230 V actuator-control product is not a US 24 V HVAC replacement. We have not established an exact purchasable regional unit for this catalog family. Confirm regional model, supply, actuator and platform requirements with Eve.
Boiler / water underfloor heating · European model
Meross MTS215B EU
Meross identifies MTS215B EU as a boiler or water-underfloor control with a 100–250 V AC supply and 3 A maximum output. Its regional form factor, power supply and control connections differ from MTS215MA US electric-baseboard and MTS300 24 V HVAC models.
We have not established a matching purchase offer for this boiler model. Confirm the exact heating-control interface, live/neutral supply, wall-box fit and regional installation rules with Meross and a qualified installer.
Matter thermostat FAQ
Can any Matter thermostat replace my existing thermostat?
No. Matter describes smart-home communication, not electrical or heating-system compatibility. Match supply voltage, heating and cooling stages, control type, power requirements and region first. Use the exact manufacturer compatibility checker and have an HVAC professional or electrician confirm the fit.
What is the difference between 24 V HVAC and line-voltage electric heating?
A 24 V HVAC thermostat signals compatible heating and cooling equipment. A line-voltage thermostat such as Meross MTS215MA US controls supported 120–240 V electric-heating loads. They are not interchangeable. A water-heating control or radiator valve is another distinct product.
Do all smart thermostats require a C wire?
No single rule covers every model. Meross MTS300 needs a suitable C-wire power arrangement or compatible adapter. Nest requirements depend on the model and system; the 4th-gen Learning thermostat may work without a C wire, but some installations need one or a Nest Power Connector. Check the manufacturer requirements rather than guessing from wire colors.
Does Matter replace the manufacturer setup app?
Not always. Meross MTS300 requires the Meross app for initial HVAC configuration. Google’s April 2026 version 2.4 update adds on-device setup to the 4th-gen Nest Learning Thermostat. Firmware, remote access and advanced features still have model-specific requirements.
Does Matter support every schedule, sensor and energy feature?
No. Available controls and accessories vary by firmware and platform. Google’s 4th-gen version 2.4 adds Matter bridging for thermostat sensors, but that does not establish support in every app. Manufacturer-app schedules, reports and learning features are separate from the basic controls a platform exposes.
Is Eve Thermostat the same as Eve Thermo?
No. Eve Thermo is a radiator valve. Eve Thermostat includes distinct regional wall-control products; the European model is for compatible water-based underfloor heating, while the North American product has separate requirements. Check the exact regional model, not just the Eve name.
How this guide was prepared
We reviewed manufacturer specifications, current support information and exact retailer identities on September 16, 2026. Firmware entries, consumer models, regional versions and bundles are kept separate. A certification record does not establish every retail variant or the software currently installed on it.
This is a source-based comparison, not a lab test, installation tutorial or exhaustive ranking. We do not promise savings or publish unverified prices and availability. Manufacturer compatibility checks and professional installation advice take precedence over a shopping summary. Read our editorial policy.