Mr. Heater Portable Big Buddy™ Heater With the output to heat up to 400 square feet for up to 120 hours on a bulk cylinder, this powerful little heater is ideal for taking the chill off almost any place you need extra warmth. And because it’s equipped with a low-oxygen shut-off pilot safety, it can be used safely in tents, blinds, ice shacks and other enclosed areas. Three settings let you adjust the heat from 4,000, to 9,000 or 18,000 BTUs/hr.
