Unopened box ASSEMBLED IN USA - Product is proudly assembled in the USA. Skilled American workers manufacture the parts, assemble, and test our products. Only high-quality materials and parts are used in the manufacturing of our products. Our factory features state of the art manufacturing equipment. TECHNOLOGY - Maximum 28,000 BTU operates on using Propane Gas only which Heats up to 1,450 sq. ft Area. DEPENDABLE - Manual Control – High/Medium/Low/Off Settings, Ideal for greater heat flow that could add the warm atmosphere in your room. ECONOMICAL - 99.9% efficient with Vent Free gas burner. No outside duct or chimney needed! Environmental Protection and Energy Conservation. SAFE - Push button Piezo ignition with Built-in pilot oxygen depletion sensor (ODS) immediately shuts down the heater if carbon monoxide or lack of oxygen is detected. 1 Year Limited Warranty