[rohrmann]

We have full timed for six years, have never kept one or the other tank closed, and the auto changeover valve always switches to the full tank when the other runs out. The lever will not move on it's own, but the red/green indicator will switch from green to red, telling you that the tank it's pointing at is empty, and when you manually move the lever the other way, the indicator will turn green, telling you that the tank it is now pointing at is full. We have never had to get up in the middle of a cold night to switch tanks, and don't understand why anyone would want to do that, when these things work so well. Once you move the lever to the good tank, you close the valve on the empty tank, disconnect the hose, and remove the tank to get it filled. Once filled, put it back in, connect the hose, and then, SLOWLY open the valve until all the way open. You are now good to go until the other tank gets empty. In colder weather, I usually check the tank indicator every day or every other day, and you will get used to how long a tank will last, and have never run out of the second tank.