Washer Freezing In Garage

I live in Denver, where it freezes in the winter. I know it's advised not to put a washer in an unheated garage, but we have no other option. It's an attached garage, which only occasionally actually freezes, and the people who owned the house before had the washer in the garage.

Our first washer worked O.K. out there for a couple of years (except occasionally when it got below zero and the outgoing drain froze). Then I guess it got really super cold once and the pump cracked, so it leaked when we used it.

We just got a new washer. We have heat tape and insulation on the water supplies, and have raised it off the cold cement floor.

I hear there is something like heat tape, but you put it inside you’re outgoing drain pipe. Is this true?

As far as the pump freezing, can I zigzag some heat tape across the bottom of the washer, or point a space heater at it when it gets really cold?

Any help would be appreciated.