we recently bought a new triple burner gas log unit. the propane co set us up with a 100 gal temp tank [filled with 50 gals] because of new construction, with a larger buried tank to follow. well we were immediately impressed with the heating capabilities of the unit, and soon found out that the front burner was all we needed. well after about 15 hrs of use the pilot went out and the tank was empty. this is only a backup heat source, more for looks than use, and i'd always heard that these things are pretty efficient. well, a little math told me this insert costs about 5 bucks an hour to operate. before i call anyone and ask stupid questions , i figured i'd ask y'all first. that is not efficient, as a matter of fact my oil furnace, that heats the whole house, would cost half that, and firewood half again. suggestions?Oo.