It’ll cost me 4 hours at 750W to run a $60 distiller for 1 gallon of distilled water. Or I can buy a 1 gallon jug for 90 cents

I'm trying to math out the cost of using a distiller for my guitar room humidifier. It's not a big room, so the 2.5 day running time on 1 gal of water is probably going to stretch to 5 days per gallon.

Using it for the dry months, I'll need 48 refills of 1 gallons per year.

I don't know how to calculate the energy cost, but it seems like I'll only break even on the distiller after 2 years of use.

Anyone have similar experiences?