World Marketing TT-15S Propane tank Top Heater, Single Burner Feature: The low cost outdoor heater is the perfect solution to cold weather work and play! It attaches easily to a standard 20lb LP cylinder. (Sold Separately) to provide instant infra-red heat. Includes adjustable heat control value and built-in safety shut-off. Dual burners can be independently aimed in different directions. Propane tank Top Heater, Single Burner - Provides up to 15,000 BTU's of quiet, instant infra-red heat; uses 20 lb. propane tank (not included); heavy duty steel construction BTU: 9-12-15,000 Radiator Material: Propane Thermostat: Yes Room Size: Medium