How much heating does my marquee need?

Very simply one this, to raise a marquees temperature by 20degrees you require 1KW/3500BTU for 5 cubic metres.

Some examples:

  • 4x4m Commercial DIY Marquee (average height is 2.5m) = 4x4x2.5 = 40 cubic metres so requires 8KW/28,000BTU’s
  • 6x12m Commercial DIY Marquee (average height 2.5m) = 6x12x2.5 = 180 cubic metres so requires 36KW/126,000BTU’s
  • 9x12m Deluxe DIY Marquee (average height 3.05m) = 9x12x3.05 = 329.4 cubic metres so requires 66KW/231,000BTU’s

Some things to point out:

  • Most room thermostats are around the 20degree mark so if it’s below freezing outside allow for more heating
  • If there are going to be lots of openings to the outside (rather than another marquee/the house) then allow for more heating
  • If it’s a formal evening function (think ladies in evening dresses) then allow more heating
  • Better to have several heat sources to create a more even room temperature than one large heat source which risks creating too hot and too cold areas in the marquee.
  • If it’s an 18th birthday party where everyone will be drinking and/or dancing then you can probably allow less heating

In short, I would always treat this number as a bare minimum, much better to have more heating than required so it can be turned down than risk having a function ruined through lack of heat.

The sort of figures quoted here can only realistically be achieved using gas or diesel/oil powered heaters. Save yourself a headache and avoid using any electrically powered heaters or infra-red heaters. They’re fine for taking the chill off on a patio or outside a pub, they are inadequate (not to mention expensive to run) in a marquee of any decent size.

Thanks for reading.

Spencer.

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*The largest Selection of fixed size marquees in the UK. Excluding modular and folding tents. Research taken on 21/3/16.

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