Intimidated newbie question on water heater..

Sheri and I just purchased a 2006 2720SL and we can't wait to hit the road. I have to admit I'm a little intimidated by all the ways you can run the different appliances. I have a question..If we park our TM in the garage is it ok to leave the power hooked up all the time and run the water heater on electric to keep it from freezing? Any advice/suggestions is appreciated very much!!!!!