I am building my house now and want to plan for a hot tub. I have a gas line running for a grill right by where the hot tub would go. Gas is a lot cheaper than electricity where I live, so it seems gas would be a great choice for me. But then I read that gas heaters in hot tubs will freeze up and break in harsh winter conditions. My worst case is -15F at night for a couple weeks. On average mid-winter is about 15F at night with a high of 40F. Can gas work even if the tub was a couple thousand more expensive to buy?