Coleman 5038-850 BlackCat Perfectemp Catalytic Propane Heater with Instastart Technology

The Coleman 5038-850 BlackCat Perfectemp Catalytic Propane Heater with InstaStart Technology provides you with comfortable warmth indoors or in a tent. This catalytic heater has an electronic ignition which is not only quicker and easier that using a match, but is much more reliable in cold, windy weather.
This Coleman BlackCat heater is incredibly portable for its heat output, with an easy-to-grip handle that makes it easy to carry, and compact legs that integrate into its collar for easy storage. The BlackCat's 3,000 BTU output will operate for up to seven hours on one 16.4 ounce cylinder of propane (not included).
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Mr. Heater 125,000 BTU Propane Forced Air Heater

The MH125FAV is the least powerful of Mr. Heater's line of propane forced-air heaters for larger jobs (see the MH170FAVT and the MH400FAVT). Even so, it still gives you up to 125,000 Btu--enough to heat 3,000 square feet. Though the larger models give you more Btus, the heaters in this line share the same basic features, including an automatic shutoff with loss of flame or power supply and a high-output fan that circulates heat quickly. Hooking the heater up to the 40-pound propane cylinder (not included) is easy, and the 10-foot hose and regulator are included.
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Mr. Heater 14,000 BTU Propane Tank-Top Radiant Heater

If you're looking for simplicity and convenience in an outdoor-only heater, the Mr. Heater MH12T 8,000-14,000 Btu single tank-top propane heater may be the answer. As the name implies, this unit mounts directly to the top of a five- to 20-pound propane cylinder (sold separately). To allow you to choose between conserving fuel or kicking out more heat, the MH12T has three settings, Hi (14,000 Btu), Med (12,000 Btu), and Lo (8,000 Btu). The heater shuts off automatically with loss of flame. Do not use in unventilated areas. One-year limited warranty.
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