Fresh water tank under camper-Camping in colder weather.

While in use you are generally fine down to about 25F. Maybe lower. If the tank is less than full a little freezing will cause no harm.

Yes an RV tank heater will work great and will take you below zero when properly equipped.

Otherwise just carry some jugs of water to flush, clean and cook.

Although there is plenty of other fresh and waste water pipes to be concerned about too.

www.ultraheat.com