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    AI Overview
    Opentherm Battery Operated Digital Programmable Room ...
    Wired, battery-operated OpenTherm thermostats provide modulating boiler control for improved energy efficiency, connecting via two cables while using batteries for power. Top options include the EPH CP4B (a battery-operated programmable model) and the smart Tado Smart Thermostat X. 
    Key Options & Models: 
    • EPH CP4B OpenTherm® Thermostat: A battery-operated, wired digital programmable room thermostat.
    • Tado Smart Thermostat X (Wired): A modern, battery-powered smart thermostat compatible with OpenTherm, Matter, and Thread.
    • Resideo T3M / T4M Series: Wired, 7-day programmable thermostats (models T4H310A3032/T3H310A0045) designed for 24-230V OpenTherm appliances.
    • E-TOP Wired Room Thermostat: A battery-powered, weekly programmable unit with an LCD display. 
    Show more

    Web results

    T4H310A3032 T4M Wired OpenTherm® thermostat


    Resideo
    https://www.resideo.com › programmable-thermostats
    Resideo
    https://www.resideo.com › programmable-thermostats
    The Honeywell Home T4/T4M/T4R are designed to provide automatic time and temperature control of heating systems in homes and apartments.Read more
    Wired battery Opentherm Thermostat from www.resideo.com

    EPH CP4B OpenTherm® Battery Operated Programmable ...


    Pirate Heating Supplies
    https://pirateheatingsupplies.com › product › eph-cp4b-...
    Pirate Heating Supplies
    https://pirateheatingsupplies.com › product › eph-cp4b-...
    This wired, battery operated digital programmable room thermostat is suitable for controlling 1 heating zone. It features OpenTherm®, Optimum Start, TPI and On ...Read more
    Wired battery Opentherm Thermostat from pirateheatingsupplies.com
    £41.82 · 15-day returns

    OpenTherm® Battery Operated Programmable Thermostat


    EPH Controls
    https://www.ephcontrols.com › Product Sections
    EPH Controls
    https://www.ephcontrols.com › Product Sections
    This battery operated digital programmable room thermostat is suitable for controlling 1 heating zone. It features OpenTherm®, Optimum Start, TPI and On/Off ...Read more
    Wired battery Opentherm Thermostat from www.ephcontrols.com
    Videos
    How to wire in the Baxi OpenTherm RF Thermostat (twin ...
    YouTube · Baxi - sustainable heating and hot water solutions
    3 weeks ago
    YouTube · Baxi - sustainable heating and hot water solutions
    5:08
    Baxi - sustainable heating and hot water solutions
    YouTube·
    Mar 24, 2026

    How to wire in the Baxi OpenTherm RF Thermostat (twin ...

    YouTube·Baxi - sustainable heating and hot water solutions·Mar 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
    Nest Thermostat - 2 Wire boiler wiring - How to - Gen 3 ...
    YouTube · IdeaMan4k
    Dec 8, 2025
    YouTube · IdeaMan4k
    1:24
    Use a 24-volt adapter with one wire to R (with the red wire) and the other to C. Plug the adapter into the basement outlet.
    IdeaMan4k
    YouTube·
    Dec 8, 2025

    Nest Thermostat - 2 Wire boiler wiring - How to - Gen 3 ...

    YouTube·IdeaMan4k·Dec 8, 2025
    YouTube
    View all

    Web results

    High quality Opentherm wired room thermostat ...


    etopcontrols.com
    https://www.etopcontrols.com › opentherm-wired-room...
    etopcontrols.com
    https://www.etopcontrols.com › opentherm-wired-room...
    Jan 12, 2023 — Opentherm wired room thermostat: Battery power supply, Weekly programmable, big LCD diplay, connect to opentherm boiler with two cables.Read more

    Wired Smart Thermostat X


    Tado
    https://shop.tado.com › products › smart-thermostat-x-...
    Tado
    https://shop.tado.com › products › smart-thermostat-x-...
    The Smart Thermostat X is compatible with most boilers and heat pumps (Relay or OpenTherm). You can also use it to control your water-based underfloor heating.Read more
    €69.99 · In stock · 4.7(42) · 30-day returns

    ESPHome OpenTherm Thermostat


    DIYLESS Electronics
    https://diyless.com › blog › esphome-opentherm-thermos...
    DIYLESS Electronics
    https://diyless.com › blog › esphome-opentherm-thermos...
    Dec 5, 2024 — This wired solution is perfect if you're looking for a stable, low-latency connection with no reliance on batteries or wireless communication. # ...Read more
    Popular products
    • Ideal Boilers Controls ECO2 Opentherm Wired Room Thermostat 221527.
      Ideal Boilers Controls ECO2 Opentherm Wired Room Thermostat 221527
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      Ideal Boilers Controls ECO2 Opentherm Wired Room Thermostat 221527
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    • Danfoss ORT-01 OpenTherm Pi Control Room Thermostat Modulating LED 087N774300.
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    • Honeywell Resideo T87M2018 Temperature selector Room thermostat for connection to Opentherm New.
      Honeywell Resideo T87M2018 Temperature selector Room thermostat for connection to Opentherm New
      $69.90
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      Honeywell Resideo T87M2018 Temperature selector Room thermostat for connection to Opentherm New
      $69.90
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    • WHITE-RODGERS Classic 80 Series Thermostats, 5-1-1 Programs, 1 H, 1 C, Hardwired/Battery, 24VAC, 01F80 361.
      WHITE-RODGERS Classic 80 Series Thermostats, 5-1-1 Programs, 1 H, 1 C, Hardwired/Battery, 24VAC, 01F80 361
      $74.89
      Zoro
      Free delivery by Thu
      4.7(234)
      WHITE-RODGERS Classic 80 Series Thermostats, 5-1-1 Programs, 1 H, 1 C, Hardwired/Battery, 24VAC, 01F80 361
      $74.89
      Zoro
      Free delivery by Thu
      4.7(234)
    • King Electric KRFTP-B Radio Frequency Battery-Powered Thermostat.
      King Electric KRFTP-B Radio Frequency Battery-Powered Thermostat
      $284.95
      Walmart - King Electrical Manufacturing       & more
      Free delivery
      King Electric KRFTP-B Radio Frequency Battery-Powered Thermostat
      $284.95
      Walmart - King Electrical Manufacturing       & more
      Free delivery
    People also ask
    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...
    Why do hardwired thermostats have batteries?
    Even smart thermostats have batteries, and thermostat models that are wired into your home's electrical system often have a backup battery to retain their settings in the event your power goes out.Jul 27, 2023

    How to Change the Batteries in a Thermostat | Aspinwall


    Aspinwall Plumbing & Heating
    https://www.aspinwallplumbing.com › blog › july › how...
    Aspinwall Plumbing & Heating
    https://www.aspinwallplumbing.com › blog › july › how...
    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...
    Can I put batteries in a wired thermostat?
    Most smart thermostats take alkaline batteries (AA or AAA). These batteries are commonly available. Your thermostat has batteries to keep your programming saved when the power goes out. Even though your thermostat is wired directly to the furnace, a thermostat with a dead battery can lead to no heat.

    Change Your Thermostat Batteries - Salmon Plumbing & Heating


    Salmon Plumbing, Heating & Air Conditioning
    https://salmonplumbing.com › change-your-thermostat-b...
    Salmon Plumbing, Heating & Air Conditioning
    https://salmonplumbing.com › change-your-thermostat-b...

    Web results

    Good modulating/opentherm thermostat with local ... - Reddit


    Reddit · r/homeassistant
    10+ comments · 2 years ago
    Reddit · r/homeassistant
    10+ comments · 2 years ago
    I'd like to switch to a modulating thermostat (ie one that supports opentherm) and integrate it with HA. I'd prefer to avoid opentherm gateway.Read more
    Wired battery Opentherm Thermostat from www.reddit.com
    Does hardwired thermostat require batteries? : r/tado ...
    10 posts
    Jan 22, 2021
    Is it standard for thermostats attached to the wall to be ...
    9 posts
    Aug 22, 2025
    More results from www.reddit.com

    Honeywell Home DT4M Grey Hard Wired Thermostat ...


    Plumb2U
    https://www.plumb2u.com › honeywell-home-dt4m-gre...
    Plumb2U
    https://www.plumb2u.com › honeywell-home-dt4m-gre...
    This thermostat has easy-to-use features that make it a great choice: no installation hassle, automatic temperature control, and one-touch buttons for changing ...Read more
    £50.49 · 14-day returns

    Exploring Smart Thermostat Integration and OpenTherm ...


    Aqara Forum
    https://forum.aqara.com › exploring-smart-thermostat-i...
    Aqara Forum
    https://forum.aqara.com › exploring-smart-thermostat-i...
    Sep 21, 2025 — I've been researching alternatives and came across the Ideal Halo system, which supports OpenTherm and can modulate two heating zones. However, ...Read more
    People also search for
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    Wired battery opentherm thermostat installation
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    Honeywell Wireless Thermostat

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