Smart Thermostat V3 and it's batteries
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I’m assuming your old room thermostat was the mechanical type. I think every thermostat with a digital display is battery powered only, I’m yet to find one that isn’t.
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Well, there are different solutions for this. Some smart thermostats have a powersupply located at the boiler, that powers the thermostat via the same wires as are used for the control.
That solution of using mains power at the thermostat is of course possible, but is likely only used for native thermostats sold with the boiler and installed professionally. The "3rd party" manufacturers like Tado (or Google or others) would not want to use that because it is usually not available and there is a risk when such installations are tampered with.
The Tado thermostat can be used either wired or in a wireless configuration (with a wireless receiver or extension kit as it was previously called). I presume that is the reason why they use batteries.
My V3+ thermostat is running on its first set of batteries for nearly 2 years now. But I do not use the relay control, I use OpenTherm. That probably uses less of the battery power.
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