Desa Tech A50S is a portable heater with a 50,000 BTU per hour output rating, making it suitable for use in large spaces. It features a solid state control system that shuts down the heater if it fails to ignite or if the flame goes out during operation, ensuring safety. The heater also has a thermostat control kit accessory that allows users to set the desired temperature and have the heater cycle on and off to maintain it. Additionally, the Desa Tech A50S has a fuel tank capacity of 4.5 gallons and a fuel consumption rate of 0.33 gallons per hour, providing extended runtime.