The portable 360 degrees indoor/outdoor LP heater works with a 1 lb.canister to provide instant heat anywhere. A 20 pound propane tank can also be used with separate/additional hose/filter (OUTDOOR ONLY). The heater holds two 1-lb. propane canisters and will provide heat up to 3.5 hours with two 1 lb canisters on low setting. - 360 degree heating - provides coverage for up to 450 square feet - up to 18K BUT's - two heat settings - 13.5K and 18K BTU's - CSA approved