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This is correct, but it’s also, it’s only 100% of the heat at that point in the circuit.
Technically, using natural gas to make electricity, then sending that electricity to an electric heater would be less efficient than burning that natural gas for heat at the source.
So it depends on where you start counting from.
I think they meant to rotate through different pictures, not to physically walk up and rotate the ipad every few hours.
Which is kind of the point of a digital picture frame, cause… why use an electronic device to display a single static picture. Just go to a store and get your picture professionally printed if you only want one.