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    AI Overview
    Modbus heat pump thermostats (typically using RS485 RTU) provide direct, granular control over HVAC systems, allowing for real-time monitoring and setting adjustments, often featuring WiFi for app connectivity. Key brands include E-top, Meitav-Tec, and Saswell, which offer programmable, multi-stage, or 2/4-pipe systems, ideal for integrating air-to-water heat pumps and fan coils into Building Management Systems (BMS). 
    Key Features and Capabilities 
    • Protocol: RS485 Modbus RTU interface for reliable, wired communication.
    • Heat Pump Control: Suitable for air-to-water units, supporting heating, cooling, and sometimes sanitary hot water modes.
    • Compatibility: Some models, like Saswell T29MTW, support 2-pipe/4-pipe fan coils and 2-stage heating/cooling.
    • Functionality: Precise temperature control (
      ±0.1∘
      𝐶
      ), programmable schedules, and frost protection.
    • Integration: Can be used with automation systems like Loxone via Modbus Air. 
    Installation and Setup Tips 
    • Wiring: Usually a 2-wire twisted pair connection for Modbus data, plus power (24VAC or 230VAC).
    • Addressing: Modbus devices must have unique addresses set, often via the thermostat menu.
    • Parameters: Baud rate, parity, and stop bits must match the heat pump controller.
    • Termination: A
      120
      Ω
       resistor may be required on the Modbus line for stable communication.       
    Common Models 
    • E-top Controls: Specializes in Modbus/Lora thermostats for heat pump master controllers.
    • Meitav-Tec: Offers ETNC-24-SUPER-MDB-01 and other BMS-compatible units.
    • Saswell: SAS908MTW for commercial DX units.
    • Pierre: Integration solutions for smart home control. 
    This video demonstrates how to connect a Modbus thermostat to a controller:
    Related video thumbnail
    1m
    i3 Engineering
    YouTube• Jun 30, 2025
    These thermostats allow for advanced automation, such as switching to cold mode based on summer settings or setting custom temperature, fan speed, and mode parameters directly from a central interface. 
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    • RS485 Modbus Smart Thermostat for fan coil, valve, heat pump or ...
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    • Air to Water Heat Pump RS485 Modbus Underfloor and Fan Coil ...
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    • OEM/ODM Air to Water Heat Pump Lora Modbus Thermostat for ...
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    • DX Thermostat with Modbus RTU for BMS Control - SASWELL
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    • MODBUS thermostats / controllers Archives - Meitav-Tec
      Modbus is a protocol interface for control solutions for HVAC systems. Some modbus thermostats include: * **ETNC-24-SUPER-MDB-01**
      meitavtecamerica.com
    • Modbus Thermostat for Commercial FCU & DX Unit Control
      Product Description. The Saswell T29MTW Modbus thermostat is a versatile commercial controller engineered for superior comfort and...
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    • MODBUS thermostats / controllers - Meitav-Tec
      Meitavtec offers many control solutions with modbus protocol interface for various hvac alternatives, by thermostats as well as dd...
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    • PIERRE Academy - Modbus Thermostat Integration
      Feb 14, 2025 — welcome to this Pierre Academy tutorial today we will integrate a Modbus thermostat into our smart system allowing precise tempera...
      YouTube·PIERRE Smart Home Solution
      3m
    • 2 - Worcester Bosch Modbus Connection
      Jun 26, 2024 — foreign the homely Hub controls the heat pump over a two-wire modbus connection single twisted pair must be used a small screwdriv...
      YouTube·Homely Energy
      1:42
    • NEW: Wirelessly integrate Modbus RTU I 2023 I 4K
      Jul 25, 2023 — most of you will know from your experience on a construction site that it is not always possible to lay a cable in a building or t...
      YouTube·LOXONE – International
      2m
    • Mitsubishi Electric Ecodan Air-to-Water heat pumps to Modbus ...
      Aug 22, 2025 — the new plug-and-play gateway for Mitsubishi. Ecodan systems delivers integration into Moddis RTU or Backnet MSTP protocols to fac...
      YouTube·Intesis by HMS Networks
      0:22
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    Discussions and forums
    Automation for sending temperature value to heat pump via Modbus TCP
    Reddit · 
    r/homeassistant
     · 6 months ago
    Automation for sending temperature value to heat pump via Modbus TCP
    Reddit · 
    r/homeassistant
     · 6 months ago
    Automation for sending temperature value to heat pump via Modbus TCP ... r/homeassistant - Looking for a smart thermostat compatible with ...  More
    Modbus heatpump issue configuration Esphome
    Home Assistant Community · 
    2 years ago
    Modbus heatpump issue configuration Esphome
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    2 years ago
    I have a heat pump boiler with modbus protocol but I can ... thermostat. - name: "Cooling Setpoint" slave: 1 address: 7203 ...  More
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    2 years ago
    Samsung Heatpump via MODBUS/RS485 - Hardware
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