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To heat a marquee you need a heater that:
1. Produces a LOT of heat
and
2. Generates CLEAN heat
Unless your marquee is quite small, affordable electric heaters are too small to generate enough heat to make a difference to the temperature - given that it's not aswell insulated as your house and it's outside - and in some cases the marquee doesn't even have sides.
You can try to use a large number of electric heaters but this typically runs you into another problem, having enough power to run them all - you regularly just end up tripping one or more of the fuses in the fuse box.
Using a collection of patio heaters puts you in a position where you run two risks:
1. You could burn the marquee
2. You could burn the marquee's occupants
A wide variety of heaters can generate large enough amounts of hot air to warm up the marquee, but it's the clean part that whittles down the options.
Propane heaters are direct fired which mean that their heat stream contains a mixture of clean heated air PLUS the combustion byproducts - which gives you the equivalent of lining up the party members in front of the exhaust pipe of your car.
Most diesel, paraffin and kerosene heaters work the same way. Large amounts of heat with enough dirty exhaust gases mixed in to completely ruin the party.
Indirect heaters are the only type of space heater that generate large amounts of clean air by using a combustion chamber to separate the stream of clean heated air from the exhaust gas stream.
For large marquees, they are the only safe option.
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