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Gas heater in GH

I have been given a gas heater for my GH. Tried this but the condensation was terrible. Other than leaving a window ajar how can condensation be avoided? We have night temps of 5C forecast tomorrow night and the GH is full of young plants and seedlings, far too many to bring indoors!
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Gas or paraffin will always create condensation as it's a product of burning hydrocarbons (the other being mainly carbon dioxide.) The only thing you can do is ventilate. The best way to heat a GH is by a temperature controlled electric fan heater but that means having a supply to the GH of course which isn't always easy.