I'm not sure how small you can get them, but if you used one of the propane catalytic heaters, it really wouldn't have an open flame for anyone to get upset about. On the other hand, depending on your water supply situation, a slow leak (to keep it from freezing up) might be a lot less expensive (even dragging the tank around to refill) than burning fuel.
Quick look shows a Coleman unit that claims to run 7 hours on a ~1lb tank for $50-100 depending on vendor. Seems pretty small, and reasonable time per fuel, especially if you used a 20-100 lb tank rather than a 1-lb tank - though that one may not be designed to use with a hose. I don't claim to have made an extensive search - I know there are large ones for big tanks, it's just a matter of how small you can get and make the connection to a large tank for your application.
A slighty more extensive look finds RV catalytics that run as small as 1/8 lb per hour consuption (slightly better than the above) but I suspect you'll need to find somewhere closer to you to get them from as I belatedly note that you are in Germany.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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