Meross Thread Smart Thermostat Valve MTS155

Meross Thread Smart Thermostat Valve MTS155

A battery-powered radiator valve that speaks Matter over Thread and works with Apple Home, Alexa and Google Home directly, provided you already run a Thread border router.

12% OFF
$67.99
$59.99

Last recorded price

Launch Year: 2026

Model: MTS155

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Works with
  • Amazon Alexa
  • Google Home
  • Apple HomeKit
  • SmartThings
  • Home Assistant
  • Matter
Connectivity
  • Thread
  • Bluetooth
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Our review

Meross Thread Smart Thermostat Valve MTS155 Review: Matter Heating Without a Meross Hub

The verdict

The Meross Thread Smart Thermostat Valve MTS155 is a radiator thermostat that connects natively over Matter and Thread, so it works with Apple Home, Alexa, Google Home, SmartThings and Home Assistant without a Meross hub. It supports up to six heating periods a day across a 5 to 35°C range, adds window-open detection, automatic valve maintenance and a temperature display, and fits most radiators with the M30 x 1.5 mm connector and six adapters. The trade-off is that Matter setup needs a Thread border router, and there is no Wi-Fi, Zigbee or Z-Wave radio fallback and no external temperature sensor support.

Best for
  • Matter and Thread smart homes
  • Apple Home, Alexa and Google Home households
  • Per-room heating control on a budget
  • Renters who cannot touch the boiler

Pros

  • Native Matter over Thread, with no Meross hub required
  • Works with Apple Home, Alexa and Google Home, and reaches SmartThings and Home Assistant over Matter
  • Up to six heating periods a day across a 5 to 35°C range
  • Window-open detection pauses heating for 30 minutes
  • Automatic valve cycling keeps it calibrated and free of scale
  • On-device temperature display and heating history in the Meross app
  • M30 x 1.5 mm connector plus six radiator adapters included

Cons

  • Needs a Thread border router for Matter setup
  • No Wi-Fi, Zigbee or Z-Wave radio
  • Two AA batteries are not included
  • No external temperature sensor support
  • No geofencing, frost protection or child lock

Who is the Meross MTS155 for?

This valve suits households already running a Matter and Thread smart home, since it joins Apple Home, Alexa, Google Home, SmartThings and Home Assistant over Matter with no Meross hub in the middle. It is aimed at anyone who wants to heat room by room without replacing the boiler thermostat, and at renters who can swap a radiator valve head without altering the heating system. Because it relies on Thread, it fits homes that already have a border router such as an Apple HomePod mini, an Amazon Echo (4th gen) or a Google Nest Hub (2nd gen).

What stands out on paper

The headline is native Matter over Thread: the valve is a certified Matter device, so one pairing can expose it to several ecosystems at once instead of locking it to a single app. Control is local over Thread, while the Meross app connects over Bluetooth for advanced settings, heating history, temperature calibration and schedules of up to six heating periods a day between 5 and 35°C. A window-open detection feature pauses heating for 30 minutes when it senses a sudden temperature drop, and an automatic maintenance routine cycles the valve fully open and closed to keep it calibrated and free of scale. The round body carries its own temperature display, and the package includes the M30 x 1.5 mm connector plus six adapters for common European radiator valves.

What to know before you buy

The MTS155 is a Thread device, so a border router is mandatory for Matter use, and there is no Wi-Fi, Zigbee or Z-Wave radio to fall back on. It reports temperature but does not accept an external temperature sensor, and it has no geofencing, frost-protection mode or child lock. It runs on two AA batteries that are not included. Setup happens through the Meross app over Bluetooth, and the advanced scheduling and heating history live there rather than in the Matter controllers themselves.

Is the Meross MTS155 worth it?

For a Matter-first home, the MTS155 covers the essentials well: broad ecosystem support from a single Thread pairing, per-room scheduling, window-open detection and hands-off valve maintenance, all at a budget-friendly price and without a proprietary hub. The main caveats are the border router requirement and the absence of Wi-Fi or an external sensor, so it rewards anyone who already runs Thread and wants a straightforward, hub-free way to add smart heating to several rooms.

Frequently asked questions

Does the Meross MTS155 need a hub?

No Meross hub is required. As a Matter over Thread device it needs a Thread border router instead, such as an Apple HomePod mini, an Amazon Echo (4th gen) or a Google Nest Hub (2nd gen).

Which smart home platforms does it work with?

It works with Apple Home, Alexa and Google Home over Matter, and the same Matter pairing brings it into Samsung SmartThings and Home Assistant.

Does it use Wi-Fi or Zigbee?

No. The MTS155 connects over Thread and Bluetooth Low Energy only, so it has no Wi-Fi, Zigbee or Z-Wave radio.

What batteries does it take?

It runs on two AA batteries, which are not included in the box.

Will it fit my radiator?

It uses an M30 x 1.5 mm connector and ships with six adapters (Danfoss RA, RAV and RAVL, M28 x 1.5, Caleffi and Giacomini), which covers most thermostatic radiator valves.

Can it use an external temperature sensor or geofencing?

No. It measures the room temperature at the valve and supports neither an external temperature sensor nor location-based geofencing.

At a glance

Summary

Everything this radiator valve supports, grouped by category.

Size & Materials
3.2 × 2 × 2 in (82 × 50 × 50 mm)
Connectivity
BluetoothThread Protocol (Thread Border Router required)
Integrations
Google HomeAlexaApple HomeKitSamsung SmartThingsHome AssistantMatter
Sensors
Temperature
Scheduling
Manually
Features
Display Temperature

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Company
Meross logo

Meross

4.3/ 5 avg ratingChina flagHeadquartered in China

Meross is a smart home brand offering affordable connected devices such as smart plugs, switches, garage door openers, LED lighting and sensors. Many Meross products support Apple HomeKit alongside Alexa and Google Home, making them a budget-friendly option for HomeKit users. The brand is popular for adding smart control to everyday home fixtures.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials
Dimensions

3.2 × 2 × 2 in (82 × 50 × 50 mm)

Weight

?

Power
Battery Type

2x AA

Battery Life

?

Connectivity
2.4 GHz WiFi

NO

5 GHz WiFi

NO

Bluetooth

YES

Z-Wave

NO

Zigbee

NO

Thread Protocol

Thread Border Router required

Integrations
Google Home

YES

Alexa

YES

Apple HomeKit

YES

Via Matter

Samsung SmartThings

YES

Via Matter

Home Assistant

YES

Via Matter

Matter

YES

Display
Screen

YES

Screen Type

?

Sensors
Temperature

YES

Humidity

NO

Scheduling
Manually

YES

Automatically

NO

Suggestions

NO

Features
External Temperature Sensors

NO

Geofencing

NO

Frost Protection

NO

Child Lock

NO

Display Temperature

YES

Automations

YES

Required to work

You need a Thread border router for this

View all
Why it needs a Thread coordinator

The Meross Thread Smart Thermostat Valve MTS155 speaks Thread, which needs a border router on your network to reach your phone and your automations. These are the border routers in our catalog that can run it.

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