On: DIY gadgets that could keep your energy bill down

[Nextgrid]

Watch out with smart plugs and heaters. I personally would only trust smart plugs to half their rated current.

[green-salt → Nextgrid]

Good call, I've had these Sonoff plugs run at 1000w for several days before (a big dehumidifier that maintenance put in to dry out a leak), but at "high" setting on the fan the inrush current goes to 15A, at medium the inrush is 7A and stable at 6.