It depends; if you have a shed or a small guest bathroom that is heated with electricity anyway for instance, you don't burn any more money when switching from a resistive to a 'semiconductor-based' electric heater.

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I just checked their Indiegogo updates page and there was an update only a few minutes ago. They make the housing in other colors now, which I find unnecessary, but what's more exciting is that they finished making some demo units and started production.