"Tom Lachance" wrote in message

He's right, but for the wrong reason. A propane tank needs the air around
it to vaporize properly. Propane boils at -44 degrees. This boiling occurs
on the part of the tank with that has liquid in contact with it. If the
tank is covered with snow, it acts as an insulator preventing the
surrounding air from coming in contact with the liquid surface area of the
tank.

The snow can be a good thing. If it is well snow packed and about 0
degrees, it will provide insulation if the air temperature suddenly drops
to -45.

In any case, I don't see how it would make any difference as the heater
burns vapor and the Btu content is not changed.