The reading may be zero, as stated, and for reasons of the current being below the threshold, as stated, but if like mine it is warm then it must be burning electricity to some small extent.

Any warm device which is switched off at the device but on at the mains is suspect. The industry should be banned from producing products which 'require' continuous consumption.

I believe the greatest benefit from our new condensing gas boiler is that there is no pilot light burning 24/7. This is just what we now need in every electrical device.
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muymalestado