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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. C

    NEST + OpenTherm/eBUS interface

    Hi there folks! I'm wondering to buy the eBUS/OpenTherm Interface to allow my Saunier Duval boiler (Bulex, Valliant,...) to modulate with Nest Thermostat v3. As much of you can guess, my boiler is not compatible with OpenTherm but eBUS.... 😖 So I have many options: Buy another boiler....(💸)...
    • caosmar
    • Thread
    • america ebus help interface nest opentherm saunier usa vaillant
    • Replies: 8
    • Forum: USA
  2. E

    Nest Opentherm wiring

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    • erion
    • Thread
    • america nest opentherm usa wiring
    • Replies: 14
    • Forum: USA
  3. J

    Vaillant Boilers, Nest and Opentherm

    Good evening you marvellous lot! So, i have a client that wants the Vaillant pure combi boiler (my go to rear flued boiler), with a Nest controller. As far as I can tell, there is no easy way of making these 2 work easily together. The only way I can find is to use the following thingy...
  4. J

    Boiler Plus - Smart Controls & OpenTherm

    Good evening All, I have come accross a situation and I would like some opinions. I am installling a combi boiler in a property with.......no internet! My usual MO has been to fit a combi and Nest combo to keep homeowners and the law happy. Specifically Ideal Vogue Max Combi using the...
  5. Husk24

    Question about opentherm

    hi guys Im thinking of buying a nest thermostat. I am aware my boiler is opentherm compatible. Im particularly interested in the way the boiler runs using opentherm. After installing this thermostat I decide do not like the way opentherm works, would it be easy as switching opentherm off from...
  6. D

    Complicated? Opentherm or on/off

    Sorry to trouble you but I wondered if one of you genius out there could help with some technical advice? I have a Vokrea i36 Utica (of which I am very pleased it’s a nice piece of kit). It is classed as an opentherm boiler. Additionally it modulates on a 10.1 ratio. Now. I have it wired to...
  7. wattsie1987

    Vaillant opentherm compatibility

    Hello lads are these Vaillant only controls for comp or are they opentherm compatible, seeing mixed opinions and some saying an ebus adapter is required? Cheers
  8. 1

    Help! Nest - Dual zone - Opentherm!

    Afternoon all After getting to a point where i am almost ready for my new boiler system to be fitted. I am going for either a Viessmann or unvented but i think swaying towards the unvented due to hot water contingency if the boiler goes down (too many stories of people waiting days for parts...
    • 1animal1
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    • Replies: 61
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  9. P

    OpenTherm on y-plan

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  10. M

    Nest , Intergas and Opentherm problems

    This guy decided to buy all his own materials to save money. Was advised that his proposed solution wouldn't work with Nest, and to but EvoHome. Didn't take the advice, and has apparently pestered the hell out of Intergas and Honeywell tech trying to make this setup work..
  11. P

    Nest , Intergas and Opentherm problems

    Hi All, I posted this on the ultmatehandyman forum as well, but I am abut desperate for help If anyone here has any thoughts as to what might be going on it would be gratefully received. Bit of a last dash attempt with this now to get it going before I pack it up and send it back to Nest...
  12. R

    Ideal Vogue & Opentherm via Honeywell T6 Lyric (wired version)

    Hey all, apologies for the long post: I've had a new Ideal Vogue boiler installed with a T6 wired thermostat so the OpenTherm is activated as confirmed by the boiler. I also have the outdoor sensor installed but I now understand that when OpenTherm is used it ignores the outdoor sensor...
  13. M

    Opentherm and weather compensation - detailed info needed please

    As above - I'm looking for information on Opentherm and weather compensation. If anyone has documentation, links to websites, manufacturers resources, etc etc. please would you share? Looking to get up to speed with the principles and theory behind this very quickly! Also, if anyone has...
  14. J

    Auto air vent placement

    If anyone can give me pointers I'd be most grateful. I have flow and return coming in at the floor level in one corner of a room that rises to ceiling level runs around three walls and drops to the ufh manifold. It is drained at the moment but when I refill Id like to have done the most I can...
  15. D

    Viessmann 100-W Vitodens with weather comp and opentherm query?

    Hi all, As you probably can tell i don't come on here much but I've come across a couple of teething problems with my new system which i have only just installed. OK here is my set up: Viessmann 100 -W WB1C 19kw system boiler utilizing the 4 pipe system Viessmann unvented cylinder connected to...
    • danny848
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    • 100-w controller opentherm query system viessmann vitodens water weather
    • Replies: 0
    • Forum: Plumbing Jobs | The Job-board
  16. R

    Can an Ideal Logic Heat boiler be controlled with opentherm?

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