4 ms·
Open by name but you need to join their OpenTherm Association to access the protocol spec (or use Google).
by nsteel 4y ago
Open by name but you need to join their OpenTherm Association to access the protocol spec (or use Google).
- IshKebab 4y agoYeah that's a bit disappointing but I can see why they would want to do that in order to force compatibility. There does seem to be a copy of the 2.2 version (latest is 3.0) floating around so nothing stops you using that - as someone has done: http://ihormelnyk.com/Content/Pages/opentherm_library/ http://ihormelnyk.com/Content/Pages/opentherm_library/ I couldn't find version 3.0 though.
- nsteel 4y agoI couldn't find setting flow temp in 2.2 (only reading) but I only skimmed it. Edit Although to be fair it's way more open than something like EMS, which is what my Worcester Bosch uses. There's some info on that from reverse engineering efforts but that's it. If I was buying a new boiler I'd try and get one with Opentherm support for future proofing. Surely more controllers will come out. Isn't much at the moment AFAIK.
- deleted 4y ago[deleted]
- IshKebab 4y agoYeah I also have a Worcester Bosch one and always was disappointed that it didn't support OpenTherm but it turns out they make a £40 adapter to convert EMS to OpenTherm! I've ordered it. We'll see. Looks like the "Control setpoint" is the relevant command for flow temperature.