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I have been thinking of this a lot, and have decided to get as efficient of electric kettle as possible to replace using our old tea kettle on our propane burning kitchen stove. Our electricity is solar and wind produced (with our own PVs and wind generator), so our electricity is almost free, or more accurately, our electric bills were paid in a lump, many years ago, when we bought and installed the PVs and wind generator.
For me, it is a choice between buying propane to heat the water, or using "free", non polluting electricity.
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