My wife needs a CPAP machine for sleep apnea. One of the things her model does is humidify the air. To do this it evaporates about 1 cup (237 mL) of water every night.
One is strongly advised to use distilled (i.e. deionised) water as, if one uses the hard tap water, limescale quickly builds up.
Now while distilled water is not expensive (though it does add up), I am wondering if I can get it for free from one of the devices in my house.
I have noticed we have a few machines that produce a fair bit of water:
dehumidifier - My notion is since it is pulling water vapour our of the air, the fact that it is vapour means it can't have much impurities dissolved in it. Though vapour isn't a gas so maybe it can.
condensing clothes drier - After drying a load of washing it needs at least 2 cups (473 mL) of water to be drained. If all that water is being evaporated (rather than spun) out of the cloths then it should be pure.
window vacuum - You use this to wipe/suck condensation off of windows. It doesn't make much water but it does make some.
Maybe other devices too, like fridges?
The water doesn't need to be perfect, and certainly doesn't need to be food grade. But I am wondering is any of my household see devices are producing distilled water?