[Huck]

Terry,
We spent one winter in north west PA when my father in-law was in hospice care.
It was below zero for days at a time and below freezing for weeks at a time.
I used heat tape inside the foam insulation, then Y the hose to the fresh and flush inside the utility/hookup compartment. I also filled the lower and outer utility/hookup compartment with fiberglass insulation.
I also used a small thermostatically controlled electric heater in the utility area of the basement.
I don't know how the newer suites are built but the older ones have water lines(to the bath sink and washer) that are in the open area of the basement. I put foam tubes on them too.
After all of this, the only frozen water I ever had was one morning the water filter that hangs right next to the cold steel frame froze. And the electric heater was right on the other side of the filter, but not aimed towards it.
I also had a remote sensor thermometer in the lower area of the basement(down near the gray dump valve, on top of the insulation) to monitor the temp. down there.