Very efficient, cut my heating bill in half from a regular furnace.
All the ones I have seen are set up for duel fuel propane or natural gas.
I run natural gas in the house and propane gas grill bottles in the garage.
Insulation is not the best in the garage so in the dead cold 0 degrees in the winter, the most it will burn is two tanks in the winter. So $26 a week to heat the garage in the dead of winter.
