Originally posted by splin
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And as far as who is to blame in the compatibility issue, (Honeywell or the boiler maker) I would have to lean on the side of the boiler maker for two reasons - one is that many boilers do work correctly with Evohome, and secondly OpenTherm is actually a protocol that was designed BY Honeywell, and then made available for others to use. So if anyone is going to get the protocol implemented correctly I think it would be Honeywell with their flagship product!
On the other hand OpenTherm is an optional, afterthought checkbox feature on many boilers, so I doubt they put much effort into making sure the implementation is correct, bug free and robust, especially those brands that actively avoid selling the OpenTherm module for their boilers into the UK market...
If I owned the affected boiler I would be feeling fairly aggrieved at being fobbed off, and one thing is sure - if I was in the market for a new boiler I would only choose one that was known to work properly with Evohome using OpenTherm. I wouldn't buy it on checkbox compatibility alone.
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