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opentherm

OpenTherm (OT) is a standard communications protocol used in central heating systems for the communication between a central heating boiler and a thermostatic controller. As a standard, OpenTherm is independent of any single manufacturer. A controller from manufacturer A can in principle be used to control a boiler from manufacturer B. However, OpenTherm controllers and boilers do not in fact always work properly together. The OpenTherm standard comprises a number of optional features and some devices may include manufacturer-specific features. The presence or absence of such features may impair compatibility with other OpenTherm devices.

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  1. nick_p

    Vaillant Ecotec system boiler with VR66 and Opentherm (VR33 and Nest)

    Hi everyone, Just wanted to share my experience with "upgrading" an S plan setup to Opentherm and Vaillant Control Center (VR66). There are a few threads on a few different forums but I wanted to share a full write-up with all the steps needed, benefits and costs. Overall, I fully recommend...
  2. R

    Weather comp (baxi ifos) with nest opentherm thermostst

    Hi all, I have just bought a google nest 3rd gen thermostat to be connected opentherm. I currently have the baxi ifos rather comp fitted. I was told that it was either one or the other, but baxi technical dept have said I can wire an opentherm controller alongside the ifos system. Boiler is...
  3. A

    ATAG OpenTherm and/or weather comp

    Hello everyone, I am new to the forum, thanks for having me. Tomorrow I am getting an ATAG i28C installed but, unfortunately, the gas engineer that will fit it is not an ATAG partner. Therefore, I spent the weekend trying to understand a bit more about what options I would have to control the...
  4. yngndrw

    Which Controls: OpenTherm with Hot Water Priority

    Hello all, I'm looking for suggestions on heating controls. We'll be upgrading our boiler (To a modulating oil system boiler - EOGB Sapphire) and unvented cylinder (To a Mixergy cylinder) as we currently have a 13 year old fixed output combi boiler with a unvented cylinder which is fed solely...
  5. N

    Baxi 600 without opentherm

    I've got a Baxi 600 combi, with a Google Nest thermostat, fitted a year ago. I've just learnt about OpenTherm, so went into my Nest settings, and found that it is disabled (only on/off mode is selectable, OpenTherm gives an error message). I spoke to the installer who says that he never...
  6. F

    Ideal boiler cycling with Nest & Opentherm

    Hi all, I have an Ideal Logic max 35 and have just connected my Nest thermostat via opentherm. The boiler modulates the water temp fine but as the heat reaches the the target temp on the thermostat, the boiler turns the flame off, keeps the pump running and then every 90-120seconds refires the...
  7. R

    Wireless opentherm upgrade ?

    Hi all Had my old baxi 105 replaced with a baxi 630. Got the ifos fitted and set to curve 40. So far all ok. My controls are a salus iT500. Now I realise this is not opentherm compatable, so is worth upgrading to an opentherm smart thermostat to work along side the weather compensation ?? I...
  8. K

    Going mad about system boiler efficiency - HELP!

    I'm a Worcester man. Hello! Anyone still there?.... I tried viessmann to up the efficiency and altho the boiler was nice, I couldn't live with their stupid vicare stat and lack of control and I'm a big believer in matched controls. I like the Worcester easycontrol (in essence) and the ability to...
  9. I

    Baxi system boiler and Opentherm

    Hello Does anyone know if its possible to connect an Opentherm thermostat such as a Nest to a Baxi 800 System boiler. I know its possible with a Baxi 800 Combi but I cannot find any information on achieving this with a system boiler. I wondered if its possible to control the radiator flow...
  10. S

    IDEAL icos he30 boiler Opentherm

    Hi all, I have an IDEAL icos he30 boiler. I understand that this is not Opentherm capable, as it is quite old. But I was wondering if there is a way to do this, as I would like to use a Tado or Nest thermostat on it? Any advice would be appreciated. Thanks
  11. G

    Recommended smart thermostat/controller for ATAG combi (ATAG or Tado)

    Hi all I'm considering getting an ATAG IC Economiser (combi), and to take advantage of the 14 year warranty I need to get one of 2 smart controllers: ATAG One Zone Tado v3+ An annoyance about the Tado is that the UK version doesn't support OpenTherm (unlike the EU model), but this is...
  12. S

    Baxi Potterton Performa 30 HE OpenTherm and Tado

    Looking to connect a Tado extension kit and smart thermostat to a Potterton Performa 30 HE boiler. Is this boiler OpenTherm compatible, or does it have some other eBUS for digital control? I can find absolutely nothing online and the the installation manual does not mention digital control. If...
  13. albert85

    System Boiler (Y-plan) with Google Nest 3rd Gen and OpenTherm?

    Hi I've got an Ideal Logic+ System Boiler (installed by my plumber as a Y-plan currently in the simple on/off mode) with Google Nest 3rd Gen. Is it possible to upgrade my system so that the Nest 3rd Gen controls the boiler via the OpenTherm protocol for both the heating and for the hot water...
  14. PedroM

    Nest Thermostat can't detect OpenTherm connection on a Baxi boiler

    Hi, I live in Lisbon and I've just installed a Baxi combi boiler and connected it with a Google nest 3rd generation thermostat as the picture below depicts. The issue is that the nest thermostat can't detect the Boiler's OpenTherm connection and displays the following error: Does anyone has...
  15. G

    Competent heating installer wanted in West Yorkshire

    I am urgently in need of a new boiler install in Huddersfield. My plan was to go with twin Opentherm boilers around 30KW each System is a very large listed home with currently a failed Potterton Eurocondense EC 65 KW, evoHome and pressurised water cylinder. Fan has died and is discontinued. If...
  16. M

    Switching to OpenTherm with Ideal Vogue Max 40

    Hi I have a normal on/off thermostat connected to my Ideal Vogue Max 40 and have been looking through the installation manual (here) to see how to connect an Opentherm stat. The instructions say "The link wire on the 230V installer room stat/timer connection gives a demand in conjunction with...
  17. M

    ESRTP4RF+ Opentherm

    Hi, new here. I just had an Ideal Vogue Max 40 fitted and it has an ESI ESRTP4RF+ connected to it. I purposely asked for a cheap and cheerful control device so I could do my own research and choose a better control method in the near future. Plumbers were superb, clean, tidy and the job is...
  18. R

    Hive vs Opentherm energy savings

    Hi, we've recently moved into a home with a Hive thermostat (no hub) and an old regular boiler. We are looking to replace the regular boiler with a combi (probably Ideal Vogue) as we are mainly interested in reducing our large energy bill. We are also considering adding TRVs to avoid heating the...
  19. L

    Vaillant boiler - what do the buttons do, controlling the boiler, and opentherm

    Hi, I've got a "Vaillant ecotec pro 28 VUW GB 286/3-3", I think it's around 10+ years old or so. I don't have a user manual, and I can't find one for this model online on any of the "manual websites" on the internet. The control panel looks like this - see the attached picture. What do those...
  20. D

    Vokera and Nest opentherm.

    Hi All Just to ask. I’ve a Vokera Unica, i36 (ERP), great boiler by the way. I have an external sensor. Apparently, I can wire up the nest (3rd gen) and use that as an opentherm stat. At the moment I’m assuming it’s an on off stat. I have been advised that I just wire the stat in the heatlink...
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