Thanks, 200 lb tank (is that the horizontal one that's about six feet long?) for three months. Sounds like her two eaches 100 gal tanks for five weeks of heat. That's running a lot of propane in a hurry.
One of these days, I've got to bubble check for leaks. In the meantime, the tanks are empty. And we're talking about getting a different supplier. So, if the tanks are exchanged, the installer should leak check. This supplier took four days to get a truck out, even having been told there is no heat, and she has a check waiting for them.