cross-posted from: https://lemmy.world/post/34021020
I recently installed an Emporia Vue with monitoring for the individual circuit my water heater is on. It captured the very significant difference in energy usage from replacing resistive heat with heat pump.
For areas where you want to cool or dehumidify the air these help though. So where I live, during the summer these would effectively be “free” - you were going to use that energy to cool the house anyway with your AC, now you’ve just put that heat in water instead.
You can also connect it through the wall so that it uses outside air for its energy. Modern heat pump technology is so good it can remain effective all the way down to -25C.