The Mr. Heater Hero is a cordless propane heater, which means it's both portable and hassle-free. It comes with a 10-foot hose and regulator that can be connected to a 20-pound tank. A built-in battery powers the unit for up to eight hours on a single charge. To eliminate downtime, the 35,000-Btu heater also works while it is plugged in and the battery is charging. According to the manufacturer, it's half as loud as a standard heater and can warm up to 800 square feet.