When you need a backup heater for power outages or want to heat a garage, shop, tent, boat, or ice shanty but there is no other sources are available you can use Coleman 5053A751 ProCat Portable Catalytic Propane Heater. This electronic ignition cordless heater for indoor use is ready to go wherever you might need some warmth.
Constructed with 3,000 BTU output, the catalytic heater with platinum technology provides flameless heat from a pressure-regulated propane fuel system that produces a steady fuel stream, even in cold weather, at high altitudes, or when fuel is low. The starting mechanism is a fast-acting piezoelectric sparker that ignites the propane in the presence of atmospheric O2. Easy to operate, you simply screw a 16.4-ounce propane cylinder on the back, turn the knob to “on” for a few seconds, and hit the ignition switch. The portable heater moves the heat efficiently with a fan, powered by two D batteries (not included), for better circulation. The Coleman ProCat operates for up to eight hours on 16.4-ounce Coleman propane cylinder.

The heater has a piezoelectric start which usually fires up right away. It puts out a fair sized fireball when it starts which can startle you if you are not ready for it. It takes about 3 minutes to warm up and really start radiating the heat but once it gets going it puts out quite a bit of heat. It is a flame less heat and although it will not catch anything on fire the heat is hot enough to melt synthetic items that get too close. Coleman 5053A751 ProCat Perfectemp Heater price is $84.00 at Amazon