AFAIK those thermal controls use around 15W when off during the day, arouns 10W in the heater for the bimetallic strip, the rest in the CDS cell and resistor. At night it uses under 5W.
The electronic versions vary from 2W during the day to 15W, depends on the manufacturer and the design.
If you live in an area with cold weather ( really not applicable where I live near the tropics) the thermal cells are self defrosting and self cleaning snow wise, the electronic can I hear freeze solid at times.
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