Arkaussie,
In below freezing weather we supplement our propane heater with two thermostat controlled ceramic heaters, one in the bedroom and the other in the kitchen. It is a balancing act to set the thermostats on the ceramic heaters such that the propane heater will still cycle on occasionally to keep the basement above freezing.
I rarely use the second propane heater in the bath area.
I used to worry about the water compartment freezing. I recently added a 110 volt outlet inside my water compartment. I plug in a digital thermostat controlled outlet with a 60 watt light bulb. Now the light goes on when the temp is below 40 degrees and heats the water compartment. I also added some foam insulation around the sewer hose. Now I forget about the water pump freezing.