I always want an auto changeover. My previous TT did not originally have one, but after a cold Thanksgiving and having to go outside at 2 am to change the valve, I made sure I changed it. This TT didn't have electronic ignition for water heater, so besides going out to change the propane valve, I had to go outside and light pilot on water heater before I could shower that morning. Below freezing and lighting pilot made a believer out of me.