Smart thermostat MEROSS MTS155MAT

The MEROSS MTS155MAT smart radiator thermostat allows you to conveniently control the temperature in your home, ensuring thermal comfort and helping to reduce unnecessary energy consumption. The device uses Matter over Thread technology, which allows it to work with popular smart home systems such as Apple Home, Google Home and Amazon Alexa. It allows you to remotely control your heating via an app and voice commands, as well as create schedules tailored to your daily routine. The open window detection function helps reduce energy loss, heating history makes it easy to monitor costs, and automatic maintenance ensures the valve is working properly. Thanks to the M30 × 1.5 connection and 6 adapters included in the kit, the thermostat fits many popular radiator valves.

Smart management of matter instead of thread

The MEROSS MTS155MAT can be integrated with various smart home systems and adjust the temperature using the app or voice commands for Siri, Alexa and Google Assistant. You don't have to go to the radiator to change the settings. The device supports Thread 1.4 and Bluetooth 6.0 and does not require a dedicated Meross gateway. However, to use Matter features, you will need a compatible Matter controller with a Thread edge router, such as the Apple HomePod mini, Amazon Echo 4th generation or Google Nest Hub 2nd generation.

Heating schedule tailored to your day

In the Meross app, you can set a heating schedule that automatically adjusts the temperature based on selected times. Set a higher temperature for the morning and evening when you are home, and a lower temperature when you are away. This ensures that your rooms are heated according to your daily schedule, without the need to constantly manually adjust the thermostat. It helps reduce energy consumption when intensive heating is not needed.

Open window detection – less energy loss

The MEROSS MTS155MAT thermostat is equipped with an open window detection function that helps reduce energy loss when ventilating a room. When you open a window, the device can automatically stop heating for a certain period of time. This prevents unnecessary operation of the radiator while ventilating a room, helping you save energy without having to manually change the settings.

Heating history and cost control

The Meross app allows you to track the history of temperature changes, heating times and valve positions. The data, presented in daily, weekly, monthly and annual views, allows you to analyze the efficiency of your heating and fine-tune your schedule. When you enter your heating price, the app can also help you estimate costs. This makes it easier to identify where you can save energy.

Automatic maintenance and improved design

The MEROSS MTS155MAT offers an automatic valve maintenance feature that can be enabled in the Meross app. The device regularly performs a full valve opening and closing cycle, helping to prevent limescale buildup and sticking of the mechanism. This ensures smooth valve operation and accurate calibration. In addition, the reinforced design increases the durability of the thermostat, and improved measurement accuracy helps maintain the set temperature.

Wide compatibility and easy installation

The thermostat is equipped with an M30 × 1.5 connection, and the kit includes 6 adapters: Danfoss RA, RAV, RAVL, Giacomini, Caleffi and M28 × 1.5. This allows the device to be installed on many popular radiator valves without having to replace the entire radiator. The housing, measuring 8.2 × 5 × 5 cm, has a compact design, and powering it with two 1.5 V AA batteries eliminates the need for wiring. Batteries are not included.

Included in the kit

• Smart radiator thermostat MEROSS MTS155MAT
• Danfoss RA adapter
• Danfoss RAV adapter
• Danfoss RAVL adapter
• Adapter M28 × 1.5
• Caleffi adapter
• Giacomini adapter
• User manual

Warranty: months

The text is machine translated.

It is important to know

When choosing, first check whether the thermostat suits your heating system and then whether it can be integrated into your existing smart home. Pay special attention to the compatibility of the Thread connection with the central unit or network equipment you already use.

• The radiator heating label is a significant limitation when choosing: this model is not a suitable choice for underfloor heating.
• Thread itself does not provide connectivity to every smart home app or system; check your equipment's support before purchasing.
• Since the thermostat is powered by a battery, check whether this power supply method is suitable for the intended location of use.

Source of editorial recommendations: ENAA guides and team experience.

In practice

🌡️ Heating control with radiators

🟢 Very suitable – the product is specified for radiator heating, therefore it is suitable for this method of use.

🧩 Integration into an existing smart home

🟡 Compatible with limitations - Thread connection is only useful if your system and required network equipment also support it. Please check compatibility before purchasing.

🏠 Use with underfloor heating

🔴 Less suitable – the product is intended for radiator heating, so it is not the right choice for an underfloor heating system.

Answers to frequently asked questions

Is this thermostat suitable for underfloor heating?

No. The heating type information defines it for radiators, so do not select it for underfloor heating.

What to check for a Thread connection?

Check if your smart home supports Thread and if you have the necessary compatible hub or network equipment. The Thread label alone does not confirm compatibility with every system.

Description updated: November 2026

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Why buy from ENAA?

• The descriptions on ENAA are designed neutrally, with clear summaries to help you make an independent decision.