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Opentherm & Weather Comp Boilers

Discussion in 'Plumbing and Central Heating' started by D_Hailsham, 16 Apr 2021.

  1. D_Hailsham

    D_Hailsham

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    Does anyone know if there is a list anywhere online of current boilers which support Opentherm and/or Weather Compensation? I haven't managed to find one, but that could be because I'm not asking the correct question!

    Why is this information not included in the Product Characteristics Database (successor to Seedbuk) as the information is used to determine ratings?
     
  2. muggles

    muggles

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    The OpenTherm Association website will tell you which ones properly support OpenTherm. The list is short. Some manufacturers who claim OT support aren't fully compliant (IE they've bu99ered around with the protocol to sit their own ends, or only used the most basic control IDs).
     
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  4. D_Hailsham

    D_Hailsham

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    So short that there is only one boiler listed; and that's a "liquid fuel" of a make I've never come across. I remember reading, a long time ago, that the OT Associationw were stopping testing boilers for compatibility, only testing controls. Weather comp is, obviously, not mentioned.

    There is a table at https://otgw.tclcode.com/matrix.cgi showing details of many boilers, with the ID numbers they recognize, but this has been produced by boiler owners' and depends on the specific combination of boiler/control they own. Many of the boilers are not available in the UK and some of the information is obviously incorrect. There is also a table following showing information about thermostats, but this is also not always correct.
     
  5. muggles

    muggles

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    Hmm I'm obviously out of date, I was sure there were boilers listed last time I looked but I don't see them now! Bit of a pain, will have to be a long winded research exercise
     
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  7. vulcancontinental

    vulcancontinental

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    The OT Association are doing their best to standardize with the new testing device. They also issue updates to try to clarify areas of confusion of which there were a few. Control design started in the early 00's when there was little co-ordination within the Association; that has changed but it has not got sharp teeth.

    There are manufacturers who are members and who did not see the need to be tested as complying as they use the protocol for their own OT controls and boilers and do not intend to promote other combinations; a bit of a oxymoron regarding the 'Open' but here you go..

    Other manufacturers who did not like the idea of getting their products tested at the only testing establishment available a while ago looked to group together set up competitor testing house to bring the price down (hence the new OT Association test kit).

    For a boiler manufacturer alone it is relatively straightforward, what temperature shall I fire at? It is simply a kettle to make hot water. What information am I programmed to I send to the control if asked? That is less important as the control simply presents zero's to an unanswered enquiry.

    We'll get there in the end.
     
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