Will the water in an electric hot water heater freeze in an unheated crawl space if we turn the electricity off to the water heater? My guess is it will but was't sure if it was insulated on the inside and thus would not. The house is in NH and we will be there maybe 4 or 5 weekends during the winter.

If it will freeze what is the best solution.

Leave water heater on
Turn it off and drain it every time we leave
Heat the crawl space.

Thank you,