Thanks everybody; I'm at a loss too.

I've found Pulse (1988), which has the premise of a disturbance in the electrical grid acting intelligent, and reportedly features a woman being scalded in the shower;

and Amitville: The Evil Escapes (1989), features a malevolence using a garbage diposal to hurt some one.

Interested to hear there is a genre described as "Canadian Tax-Loss movies of the 70s-80s". Maybe I will start with Cathy's Curse and look up some of the other credits of the keycast members.

Who would have thought a freak typhoon would have come out of nowhere and wrecked all calculations?