valhalla360 wrote:
We prefer to only open 1 tank. If you open both, it's easy to find yourself with no propane.
If you run with 1 tank open, you know when the 1st tank is empty, so you can refill it before the 2nd tank runs dry.
I'd much rather get up at 2am, spend 2 minutes opening a valve than wake up at 2am freezing and there is no propane left.
Another idea is to open 1 tank. Then with furnace running before you go to bed, slide your fingers down the side of tank. When you find the level, decide are you sure it will last all night? If in doubt, open other valve. Morning coffee check to see if switched. Yes, pull tank. No, shut off, and repeat at bedtime. (The gods of propane will never let it switch in daytime)
Over time, you will learn how long a tank will last