Go hog wild with the 4,000 BTU "Piglet" portable propane heater from Heat Hog. This durable indoor safe portable radiant space heater runs quietly on a 1lb cylinder propane tank and doesn't require any electricity. Giving you up to 5.3 hours of heat per tank max. Design and Details: Featuring a fixed 45-degree angled heat head Curved plaque technology for a wider heating angle All with up to 4,000 BTUs of radiant heat output.Using propane gas Small propane heater heats up to 100 square feet, running on a 1lb LP cylinder Stay warm indoors and outdoors with the Heat Hog portable propane space heater Great for small spaces like your garage. tailgating, ice fishing, hunting, camping, or anywhere you need reliable convenient heat Has a safety guard, a safety tip-over switch and an Oxygen Depletion Sensor (ODS) which detects low oxygen or accidental falls, automatically turning off the unit Reliable features that enable ease of use and performance include a Piezo ignition, sturdy handle, and a quick connect rail fuel connection