It's printed in the Truma manuals, and also on Truma stickers on or near the fires. For example, my front fire in the S700 is a Trumatic E2800. The label says "Anschlussvert 0.24 kg / hr - which I take to mean 240 grams of gas an hour at full whack. The 2800 means it's the equivalent of 2.8 kw. So rounding up, if you leave the fire on maximum, it will use a kilo of gas every 4 hours, or 44 hours from an 11kg bottle. I have no idea how much the cooker uses, but it's not a fair comparison! Fulltiming in freezing weather, sat in the van all day and sleeping with the heating on medium, normal cooking, and fridge on 24 hours a day on gas, I reckon to use an 11k bottle in a week - 5 days if we don't care and just want to be warm. With gas at 55p a litre (approx 2 litres to a kilo) thaat's about £12 a bottle - I'm happy with that. Electricity is approx 15p a kilowatt hour, so to keep a 3kw heater on for 12 hours would cost just over £5, so LPG is way cheaper at the moment. In summer, my 2 x 11kg bottles just go on and on and on......))
No matter which Truma heater you have it will be roughly similar, so these figures should be approx ok for just about any classic Hymer.
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