I practically never get faxes but each time the phone rings my Canon preheats. Not only does this waste as much energy as making coffee each time someone calls, but (I know this isn't ideal but it's my only choice for now) my Canon [1200 watts] and AC [1300 watts] are on the same electrical circuit. If the phone rings while the AC is running it will overload the circuit. I always turn off the AC before printing but I have no control on when the phone rings.
Other than unplugging it from the phone line (I do send faxes occasionally), isn't there a setting so that it doesn't preheat when the phone rings? I tried to set the receive options to off/manual but it still does it.
The only advantage is that if the phone recently rang I don't need to wait 2 minutes for it to preheat before it starts printing.