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Tado° V3 vs. X series compatibility concerns

Hi everyone,

I’ve been using the Tado° V3 range (thermostat and smart radiator valves) throughout my house for about 2 years. Recently, one device broke, and when I ordered a replacement, I discovered there's a new X series, which isn’t compatible with my V3 setup.

Does this mean that once the V3 devices are discontinued, I’d have to replace my entire system with the X series if any V3 device fails?

If so, would it be wise to purchase a few extra V3 devices now? What are your thoughts or experiences regarding this situation?

Thanks in advance!

Tim