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    An AI Overview is not available for this searchCan't generate an AI overview right now. Try again later.
    AI Overview
    OpenTherm is a communication protocol that allows a smart thermostat and a compatible boiler to communicate, enabling the boiler to modulate its output for increased efficiency. Instead of simply turning on/off, an OpenTherm thermostat instructs the boiler to lower its flow temperature to maintain a consistent, efficient, and cost-effective heat. 
    Top OpenTherm-Compatible Thermostats 
    • Tado Smart Thermostats: Known for wide compatibility and app control.
    • Drayton Wiser: Offers modular smart heating controls.
    • Nest Learning Thermostat (3rd gen/E): Supports modulation with compatible systems.
    • Honeywell Home (Resideo): Offers various OpenTherm-enabled models.
    • Ideal Halo Lite: Designed for modern combi boilers. 
    Key Benefits of Opentherm Technology 
    • Energy Efficiency: Reduces fuel bills through precise modulation (matching heat output to demand).
    • Increased Boiler Lifespan: Reduces "on/off" cycling, resulting in less wear and tear.
    • Better Comfort: Maintains more consistent room temperatures.
    • Remote Diagnostics: Often provides fault codes directly to the app. 
    Compatibility & Requirements 
    • Boiler: The boiler must support the OpenTherm protocol. It is not compatible with all, particularly older boilers or those using 230v switching.
    • Wiring: Generally requires 2-wire low-voltage communication. 
    Note: For the best results, check that both your specific boiler model and your chosen smart thermostat support OpenTherm. 
    • Smart thermostat with Opentherm for conventional/system boiler
      Feb 6, 2025 — According to a Reddit user, most boilers don't support OpenTherm and instead support their own proprietary comms protocol. Some sm...
      Reddit
    • OpenTherm and what Nest thermostats can do with it - Google Nest Help
      OpenTherm is a language that allows compatible thermostats and heating systems to communicate with each other. This allows thermos...
      Google Help
    • What is OpenTherm?
      This can increase the energy efficiency of a heating system while maintaining the desired set point temperature in the home. OpenT...
      Resideo
    • 5 Things You Didn’t Know About OpenTherm
      Apr 16, 2021 — OpenTherm is a communication protocol that allows modulating boilers to communicate with room thermostats. OpenTherm devices are c...
      Resideo
    • What is OpenTherm Technology and why use it? | The Smart Thermostat Shop
      Dec 18, 2014 — Benefits of using OpenTherm include: * **Increased efficiency of the heating system** * **Reduced boiler start/stops** * **Remote ...
      The Smart Thermostat Shop
    • Benefits of OpenTherm Connectivity | Blog | Ideal Heating
      Oct 30, 2019 — The Ideal Halo Lite OpenTherm Wired Combi is an OpenTherm room thermostat that's designed for Ideal Logic Combi C, Combi ESP1, and...
      Ideal Heating
    • T87M2036 OpenTherm Honeywell thermostat
      The Honeywell OpenTherm modulating digital room thermostat is a non-programmable thermostat for OpenTherm boilers. It has a modern...
      www.todo-control.com
    • What is OpenTherm Technology?
      hi guys I'm Steve at Amp Plumbing and Eating. i just thought I'd make a quick video on open therm. technology. um in an easy to un...
      2m
      The Boiler Doctor·Steven Thompson
    • Open Therm Controls. How Can They Save Me Money?
      May 23, 2020 — Open Therm controls have the following benefits: * **More accurate temperature control** Open Therm controls limit the temperature...
      Tom Sutton Heating
    • Smart thermostat with Opentherm for conventional/system boiler
      Feb 6, 2025 — According to a Reddit user, most boilers don't support OpenTherm and instead support their own proprietary comms protocol. Some sm...
      Reddit
    • OpenTherm and what Nest thermostats can do with it - Google Nest Help
      OpenTherm is a language that allows compatible thermostats and heating systems to communicate with each other. This allows thermos...
      Google Help
    • What is OpenTherm?
      This can increase the energy efficiency of a heating system while maintaining the desired set point temperature in the home. OpenT...
      Resideo
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    My Ad Center

    Web results

    Opentherm Wireless Boiler Control Thermostat


    Xiamen E-Top Controls Technology Co., Ltd.
    https://www.etopthermostat.com › wireless-gas-boiler-o...
    Xiamen E-Top Controls Technology Co., Ltd.
    https://www.etopthermostat.com › wireless-gas-boiler-o...
    This is a sophisticated room thermostat which provides modulating control of OpenTherm equipped condensing gas boilers.Read more

    Smart thermostat with Opentherm for conventional/system ...


    Reddit · r/homeautomation
    3 comments · 1 year ago
    Reddit · r/homeautomation
    3 comments · 1 year ago
    With the cheap thermostat dhw works fine. The boiler has its own ntc sensor on the dhw tank and keeps it to temp automatically without opentherm ...Read more
    OpenTherm is really good : r/tado - Reddit
    42 posts
    Jan 26, 2024
    OpenTherm control of System Boiler (ideally with Smart ...
    4 posts
    Aug 11, 2025
    More results from www.reddit.com
    People also ask
    What is an OpenTherm thermostat?
    OpenTherm is a communication protocol between heating controls and the boiler to modulate the temperature flow through a heating system. This can increase the energy efficiency of a heating system whilst maintaining the desired set point temperature in the home.

    OpenTherm Explained - Drayton Controls


    Drayton Controls
    https://www.draytoncontrols.co.uk › news › opentherm-e...
    Drayton Controls
    https://www.draytoncontrols.co.uk › news › opentherm-e...
    Does my boiler support OpenTherm?
    Which products use Opentherm? 'Opentherm' is a common language developed by Honeywell that can be adopted by any boiler or heating control manufacturer so their products can work together. Baxi, Ideal, Viessmann, Ferroli and Main all manufacture combi boilers using the Opentherm technology.Apr 18, 2020

    Opentherm Boilers & Controls | Compatibility Guide


    The Heating Hub
    https://www.theheatinghub.co.uk › opentherm-boilers-c...
    The Heating Hub
    https://www.theheatinghub.co.uk › opentherm-boilers-c...
    Do I need a special thermostat for a boiler system?
    Does a boiler need a special thermostat? Yes, some boilers may require a specific type of thermostat compatible with hydronic heating systems, especially if they use features like zoned control or modulating temperatures.

    Boiler Thermostats: A Complete Guide to Control & Efficiency - Bryant


    Bryant
    https://www.bryant.com › controls-thermostats › for-boiler
    Bryant
    https://www.bryant.com › controls-thermostats › for-boiler
    How to wire an OpenTherm thermostat?
    The opentherm wire must be connected from the relay transceiver to the boiler. A separation of 10mm must be achieved between the opentherm wiring and 230V wiring. Use 0.5mmsq heat resistant flex. For routing of cable outside it is dependent upon the application, however cables can be run externally inside trunking.

    Installation guide - Ideal Boilers


    Ideal Boilers
    https://idealboilers.ie › uploads › documents › Touch_He...
    Ideal Boilers
    https://idealboilers.ie › uploads › documents › Touch_He...

    Web results

    OpenTherm and what Nest thermostats can do with it


    Google Help
    https://support.google.com › googlenest › answer
    Google Help
    https://support.google.com › googlenest › answer
    OpenTherm is a language that compatible thermostats and heating systems can use to talk to each other, enabling thermostats to control heating and domestic hot ...Read more
    Videos
    An overview of OpenTherm Thermostat and the Baxi heating ...
    YouTube · Baxi - sustainable heating and hot water solutions
    Feb 24, 2026
    YouTube · Baxi - sustainable heating and hot water solutions
    1:54
    OpenTherm is a protocol that sets the best operating temperature for the boiler to achieve a comfortable room temperature, increasing efficiency.
    Baxi - sustainable heating and hot water solutions
    YouTube·
    Feb 24, 2026

    An overview of OpenTherm Thermostat and the Baxi heating ...

    YouTube·Baxi - sustainable heating and hot water solutions·Feb 24, 2026
    YouTube
    OpenTherm Installation Guide | The Smart Thermostat Shop ...
    YouTube · MWPHS
    Jul 14, 2022
    YouTube · MWPHS
    9:31
    Identify OpenTherm terminals on the boiler, fit thermostat wires, and secure them. Wire the RF receiver to the OpenTherm terminals.
    MWPHS
    YouTube·
    Jul 14, 2022

    OpenTherm Installation Guide | The Smart Thermostat Shop ...

    YouTube·MWPHS·Jul 14, 2022
    YouTube
    In this video
    • 00:16
      Isolate Power Supply
    • 01:08
      Wiring the OpenTherm RF Receiver
    • 03:41
      OpenTherm Test
    • 04:12
      OpenTherm Gateway Installation
    • 05:40
      Setting up OpenTherm Monitor Software
    • 06:45
      OpenTherm Data Analysis
    • 07:01
      Demonstration
    • 07:35
      Troubleshooting
    • 08:24
      Relative Modulation
    • 09:15
      Summary
    What is Opentherm, whats makes a smart thermostat smart ...
    YouTube · Hydroheat
    Feb 18, 2020
    YouTube · Hydroheat
    11:54
    OpenTherm is a language created by Honeywang that allows smart thermostats to modulate boiler temperature for better efficiency.
    Hydroheat
    YouTube·
    Feb 18, 2020

    What is Opentherm, whats makes a smart thermostat smart ...

    YouTube·Hydroheat ·Feb 18, 2020
    YouTube
    In this video
    • 00:00
      What is a smart thermostat?
    • 00:47
      How a traditional thermostat works
    • 02:38
      Modulating Controls
    • 04:26
      Benefits of TPI
    • 06:40
      What is Opentherm?
    • 07:12
      Which boilers have Opentherm?
    • 08:02
      What is TPI?
    • 09:23
      Weather Compensation
    • 10:30
      Frequently asked questions
    • 11:23
      Thanks for watching
    View all

    Web results

    High quality opentherm wifi thermostat ...


    E-TOP Controls
    https://www.etopcontrols.com › opentherm-wifi-thermo...
    E-TOP Controls
    https://www.etopcontrols.com › opentherm-wifi-thermo...
    Looking for professional opentherm wifi thermostat manufacturer? E-TOP specializes in producing opentherm wifi thermostat, wholesale now!

    What is OpenTherm?


    Resideo
    https://support.resideo.com › article › What-is-OpenTherm
    Resideo
    https://support.resideo.com › article › What-is-OpenTherm
    What is OpenTherm? OpenTherm is a digital language that puts the boiler and thermostat in constant communication. This gives the boiler more information ...Read more

    Help choosing boiler: Is OpenTherm overhyped?


    Home Assistant Community
    https://community.home-assistant.io › help-choosing-bo...
    Home Assistant Community
    https://community.home-assistant.io › help-choosing-bo...
    Nov 17, 2025 — OpenTherm is a point-to-point communication system and connects gas central heating (condensing) boilers with room thermostats. The OpenTherm ' ...Read more
    Thermostat with OpenTherm and Zigbee? - Hardware
    Nov 26, 2022
    New Boiler - Options? Opentherm - Home Assistant Community
    Oct 18, 2021
    More results from community.home-assistant.io

    Opentherm Boilers & Controls | Compatibility Guide


    The Heating Hub
    https://www.theheatinghub.co.uk › opentherm-boilers-c...
    The Heating Hub
    https://www.theheatinghub.co.uk › opentherm-boilers-c...
    Apr 18, 2020 — These boilers are compatible with many mainstream smart and standard heating controls, including Nest, Tado and Honeywell.Read more
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    Web results

    T87M2036 OpenTherm Honeywell thermostat


    todo-control.com
    https://www.todo-control.com › ... › Wired Thermostats
    todo-control.com
    https://www.todo-control.com › ... › Wired Thermostats
    Simple non programmable thermostat for OpenTherm boilers, with no batteries required. Room temperature controlled by twisting the thermostat cover ring.Read more
    €55.00 · In stock

    Benefits of OpenTherm Connectivity | Blog


    Ideal Heating
    https://idealheating.com › blog › the-benefits-of-openth...
    Ideal Heating
    https://idealheating.com › blog › the-benefits-of-openth...
    Oct 30, 2019 — OpenTherm is a system of communication between modulating heating appliances and room thermostats which is not manufacturer dependent.Read more
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