Patio Heater needs 20lb. Propane Tank for an extra charge or you can use your own. Each 20 LB. propane tank lasts 4 to 6 hours depending on weather temperature and temperature setting.Most heaters are stainless steal, color and style may vary. Patio heater are not to be placed under tent, customers responsible for tent damage. Please request our 170,000 BTU heater to heat tent space.