Test # 72
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1940 questions in 194 tests. Each test contains 10 questions.
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The Heliotrope is Germanys first eco and energy-friendly rotating house. Designed by architect Rolf Disch this is the first PlusEnergy house in the world. The architect created this house as his private residence in 1994. This house produces more energy than it uses and the energy it produces is emissions free. The house rotates to track the sunlight and harness maximum energy of the sun in the form of heat and light. This energy-efficient house is equipped with a grey-water cleansing system and inbuilt natural waste composting.