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Thanks for your reply and apologies for confusing ATAG Z-bus and Z-Wave. I'm not an expert in this area, but from what I understand based on information found online there are different versions of the E325C boiler. This overview by Plugwise for example shows that E325C boilers manufactured after Fe...

I consider using OpenTherm Gateway, but I'm unsure whether my boiler is supported. I have an ATAG E 325C boiler, which contains a blue ATAG Z sticker (see picture). This implies the boiler is using the ATAG Z-WAVE protocol. However, I read here and there that OpenTherm and Z-Wave are similar. Additi...