Where is the best location for an expansion tank for a home in Eastern North Carolina, where the plumbing is exterior? i.e. in the crawl space. It's mostly copper piping. None of it is insulated, and it has never burst due to freezing. I don't think pipes would ever freeze since they are so close to the floor in the crawl space. It's an older house with no expansion tank currently installed. The water heater was just removed from under the kitchen cabinet, and a new bigger one installed in an exterior utility room, but no expansion tank yet. The old tank was 38 gal and the new one 50 gal. The newer plumbing that has been done is in PEX (so it won't support the weight of the expansion tank by itself.) The house and utility room are made from cinder block, so it will be a slight hassle to install strapping to hold the tank, but no big deal. Is there any danger of the expansion tank freezing if it's installed in the utility room? How about if it's wrapped in insulation like the new water heater is? Should the expansion tank go under the crawl space instead?