The Mr. Heater BIG Buddy Portable Propane Heater in Red (MH18B) is a powerful unit heater designed to cover areas up to 500 square feet. With a radiant heating system and a BTU rating of 18,000-19,999 BTU, this heater provides efficient and effective heat. The control style features a rotary knob and switch, while the power source can be electric, gas, or propane, making it versatile for various heating needs. The multicolor design and portable nature of the Mr. Heater BIG Buddy make it a convenient and reliable choice for home improvement projects involving heating, cooling, and air systems.