My washer is pretty low power consumption. I forget what exactly I set the threshold to, but when I did I was watching its output history. It spends a lot of

My washer is pretty low power consumption. I forget what exactly I set the threshold to, but when I did I was watching its output history. It spends a lot of time under 100w, and only irregularly spikes higher. It is possible to watch much higher-power systems with power clamps--the same magnetic sensor kind you can put on your entire house power feed. I have one on my 220v dryer for completeness, although I never even bothered to rig up automation. There's no real penalty for ignored dry clothes like there is for ignored wet clothes--I guess it'd be useful for people with roommates, though. Specifics devices will depend on zigbee vs z-wave vs wifi. If I were starting totally fresh, I'd go all zigbee.