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			{{multiple issues\|{{more footnotes needed\|date=February 2022}}
⚫	]]]Built originally in 1994 as the private residence and special project of ], the ] is a one-of-a-kind design. The Heliotrope in ] was the first building in the world to create more energy than it uses, of which is entirely renewable, emissions free and CO<sub>2</sub> neutral. The structure physically rotates to track the sun, which allows it to harness the maximum natural sunlight and warmth possible. Several different energy generation modules are used in the building including a 603 ~~ft<sup>2</sup>~~ ], a ], a ] and ] balcony railings to provide heat and warm water. These innovations ~~in combination~~ with the ~~superior~~ insulation of the residence ~~allow~~ the Heliotrope to ~~produce~~ anywhere between four to six times its energy usage depending on the time of year. The Heliotrope is also fitted with a ] and built-in natural waste composting.
			{{advert\|date=February 2022}}
			{{COI\|date=February 2022}}
			{{More citations needed\|date=July 2022}}}}
			]]]
			The '''Heliotrope''' is an ] housing project by German architect ]. There are three such buildings in Germany. The first experimental version was built in 1994 as the architect's home in ], while the other two were used as exhibition buildings for the ] company in ] and a dentist's lab in ] in ].

		⚫	Several different energy generation modules are used in the building including a {{convert\|603\|sqft\|m2\|abbr=on}} ], a ], a ] and ] balcony railings to provide heat and warm water. These innovations along with the favorable insulation of the residence allows the Heliotrope to capture anywhere between four and six times its energy usage depending on the time of year.<ref>{{Cite web \|title=PlusEnergyHouse "Heliotrope" {{!}} sdg21 \|date=16 August 2004 \|url=https://sdg21.eu/en/db/plusenergyhouse-heliotrope \|access-date=2023-04-28 \|language=en-GB}}</ref><ref>{{cite news \|title=Solceller \|url=https://photonic.se/solceller/ \|publisher=Solar Energy}}</ref> The Heliotrope is also fitted with a ] and built-in natural waste ].
⚫	At the same time ~~Freiburg’s~~ Heliotrope was built, ] contracted ] to design and build another Heliotrope to be used as a visitor’s center and showroom in ], ]. A third ~~Heliotrope~~ was then contracted and built in ], ] to be used as a technical dental laboratory. ~~Disch’s~~ unique design accommodates different ~~utilization~~ from private residences to laboratories, and nevertheless maintains the ~~structure’s~~ positive energy balance.~~<br><br>In~~ ~~addition~~ to the original Heliotrope design, Rolf Disch has drawn plans for larger versions of the project to be built as a rotating hotel, which gives every guest a beautiful view, as well as administrative buildings and even an exhibition pavilion for the ] in ].
	<gallery>
⚫	~~Image: LuftHeliotrop.JPG~~\|Bird's eye view of the Heliotrope in Freiburg
⚫	~~Image: Heliotrophotel_ansicht.jpg~~\|Heliotrope-Hotel Schloss Waretenstein
	</gallery>

		⚫	At the same time that Freiburg ’s Heliotrope was built, ] contracted Disch's architecture practice to design and build another Heliotrope to be used as a visitor’s center and showroom in ], Germany. A third one was then contracted and built in ], ] to be used as a technical dental laboratory. Disch's unique design accommodates different utilizations from private residences to laboratories, and nevertheless maintains the structure's positive energy balance.{{citation needed\|date=February 2022}}{{multiple image
	----
			\| direction = horizontal
		⚫	\| image1 = Heliotrop (Gebäude).jpg
			\| caption1 = Heliotrop Rotating House
			\| image2 = LuftHeliotrop.JPG
		⚫	\| caption2 = Bird's eye view of the Heliotrope in Freiburg
			\| image3 = Heliotrophotel_ansicht.jpg
		⚫	\| caption3 = Heliotrope-Hotel Schloss Waretenstein
			}}

			Disch also designed the '']'' office complex.
⚫	==]==
	] is a coined concept developed by Rolf Disch that indicates a structure’s extreme energy efficiency so that it holds a positive energy balance, actually producing more energy than it uses. With the completion of his private residence, the ], in 1994, Disch had created the first PlusEnergy house in the world. The sheer logic of a home that creates more energy than it consumes made perfect sense to Disch. His next goal in its development was thus the mass application of the concept to residential, commercial and retail space. As the concept further developed and gained financial backing as well, Disch built several more projects with PlusEnergy certifications. PlusEnergy is a simple concept that has been materialized in a technical design. “PlusEnergy is a fundamental environmental imperative,” Disch claims<ref>www.rolfdisch.de</ref>. Disch believes that passive building isn’t enough because passive homes still emit CO2 into the atmosphere – we can solar activate our homes!
	==Environment and Energy Needs==
⚫	The house is designed to face the sun during the heating months of the year and turn its highly insulated back to the sun during the warmer months when heating isn't necessary. This significantly reduces heating and cooling requirements for the building throughout the year which are provided for by a heat pump, while hot water is provided by vacuum-tube solar panels.

		⚫	==PlusEnergy==
⚫	Photovoltaic solar panels with a rated power of 6.6 kW on its roof provide five to six times more energy than the building uses, making the building energy positive (]). To further improve energy ~~production~~, the panels also rotate independently ~~from~~ the building to follow the sun, while being able to adapt its orientation in case of strong winds.
			] is a concept coined by Rolf Disch that indicates a structure's energy efficiency. A PlusEnergy building holds a positive energy balance, generating more energy than it uses. The first Heliotrope Disch built in 1994 was the first house to be ] certified. Disch built several more projects with ] certifications with the goal of bringing the concept to the residential, commercial and retail space. “PlusEnergy is a fundamental environmental imperative,” Disch claims.<ref>{{cite web \|url=http://www.rolfdisch.de/ \|title=Home \|website=rolfdisch.de}}</ref>{{nonspecific\|date=February 2022}} Disch believes that passive building is not enough because passive homes still emit {{CO2}} into the atmosphere.{{Citation needed\|date=December 2022}}

	==~~Water Usage~~ and ~~Natural Waste~~ ~~Management~~==		==Environment and energy needs==
		⚫	The house is designed to face the sun with its triple-pane windows (U = 0.5) during the heating months of the year and turn its highly insulated back (U = 0.12) to the sun during the warmer months when heating isn't necessary. This significantly reduces heating and cooling requirements for the building throughout the year, which are provided for by a ], while hot water is provided by vacuum-tube solar panels.{{citation needed\|date=February 2022}}
⚫	In order to limit water usage, a gray water circuit (for washing dishes and clothes) is used. ~~It also collects rainwater. Waste water~~ is purified in a ~~vegitated~~ cascade pond outside of the edifice.

		⚫	Photovoltaic solar panels with a rated power of 6.6 kW on its roof provide five to six times more energy than the building uses, making the building "energy positive" (]). To further improve energy generation, the panels also rotate independently of the building to follow the sun, while being able to adapt its orientation in case of strong winds.
⚫	Natural waste and excrement are dry composted in the structure as well.

			==Water usage and natural waste management==
	==Inhabitant Comfort==
		⚫	In order to limit water usage, a gray water circuit (for washing dishes and clothes) is used. Wastewater is purified in a vegetated cascade pond outside the edifice and it also collects rainwater.
	One of the main attractions of the house, apart from its low energy needs is its rotating view. As the building turns according to the sun's position, the view changes creating a spectacular view. This feature was later developed into a rotating hotel concept.

		⚫	Natural waste and excrement are dry composted in the structure as well.
	The roof deck includes a sun and viewing deck, as well as a garden terrace. The solar panels can be used for sun or rain protection while on the roof terrace.

	All floors are accessible from the spiral staircase reducing surface loss through hallways and corriodors.

	===Awards===		==Awards==
			* 2008 German Sustainability Award
	'''2008 German Sustainablity Award'''<br>2007-08 Japanese PEN-Magazine Creativity Award<br>2005 Wuppertal Energy and Environment Prize<br>'''2003 Global Energy Award'''<br>'''2002 European Solar Prize'''<br>2001 Photovoltaic Architecture Prize Baden-Württemberg
			* 2007–08 Japanese PEN-Magazine Creativity Award
			* 2005 Wuppertal Energy and Environment Prize
			* 2003 Global Energy Award
			* 2002 European Solar Prize
			* 2001 Photovoltaic Architecture Prize Baden-Württemberg

	==Selected ~~Works~~==		==Selected works==
			{{More citations needed\|date=July 2022}}
	*], ] ], 1994
	*], ], 1994		* Heliotrope, ], 1994
	*], ], ~~1995~~		* Heliotrope, ], 1994
			* Heliotrope, ], 1995
	<gallery>		<gallery>
	~~Image~~:Heliotrop Freiburg.jpg\|] in ] ], 1994		File:Heliotrop Freiburg.jpg\|Heliotrope in ], 1994
	~~Image~~:Heliotrop Nacht.jpg\|] built for ] in ], 1994		File:Heliotrop Nacht.jpg\|Heliotrope built for ] in ], 1994
	</gallery>		</gallery>

	==See ~~Also~~==		==See also==
			{{div col\|colwidth=30em}}
	<div style="-moz-column-count:2; column-count:2;">
	* ]		* ]
	* ]
	* ]
	* ]
	* ]		* ]
	* ]		* ]
	* ]
	* ]		* ]
	* ]		* ]
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	* ]		* ]
	* ]		* ]
			* ]
	</div>
			{{div col end}}

			==Notes==
⚫	== External links ==
⚫	* {{en ~~icon~~}}
⚫	*
⚫	* {{ch ~~icon~~}}
	==References==
⚫	~~<br />~~
	<br />
⚫
	{{reflist}}		{{reflist}}

⚫	]
		⚫	==External links==
⚫	]
		⚫	* {{in lang\|en}}
		⚫	* (archived 2014)
		⚫	* {{in lang\|zh}}
		⚫	*
		⚫	* (archived 2014)

			{{DEFAULTSORT:Heliotrope (Building)}}
		⚫	]
			]
	]		]
	]		]
	]		]
		⚫	]

	{{germany-struct-stub}}

⚫	]
	]

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The Heliotrope is an environmentally friendly housing project by German architect Rolf Disch. There are three such buildings in Germany. The first experimental version was built in 1994 as the architect's home in Freiburg im Breisgau, while the other two were used as exhibition buildings for the Hansgrohe company in Offenburg and a dentist's lab in Hilpoltstein in Bavaria.

Several different energy generation modules are used in the building including a 603 sq ft (56.0 m) dual-axis solar photovoltaic tracking panel, a geothermal heat exchanger, a combined heat and power unit (CHP) and solar-thermal balcony railings to provide heat and warm water. These innovations along with the favorable insulation of the residence allows the Heliotrope to capture anywhere between four and six times its energy usage depending on the time of year. The Heliotrope is also fitted with a grey-water cleansing system and built-in natural waste composting.

At the same time that Freiburg ’s Heliotrope was built, Hansgrohe contracted Disch's architecture practice to design and build another Heliotrope to be used as a visitor’s center and showroom in Offenburg, Germany. A third one was then contracted and built in Hilpoltstein, Bavaria to be used as a technical dental laboratory. Disch's unique design accommodates different utilizations from private residences to laboratories, and nevertheless maintains the structure's positive energy balance.

Heliotrop Rotating House

Bird's eye view of the Heliotrope in Freiburg

Heliotrope-Hotel Schloss Waretenstein

Disch also designed the Sonnenschiff office complex.

PlusEnergy

PlusEnergy is a concept coined by Rolf Disch that indicates a structure's energy efficiency. A PlusEnergy building holds a positive energy balance, generating more energy than it uses. The first Heliotrope Disch built in 1994 was the first house to be PlusEnergy certified. Disch built several more projects with PlusEnergy certifications with the goal of bringing the concept to the residential, commercial and retail space. “PlusEnergy is a fundamental environmental imperative,” Disch claims. Disch believes that passive building is not enough because passive homes still emit CO₂ into the atmosphere.

Environment and energy needs

The house is designed to face the sun with its triple-pane windows (U = 0.5) during the heating months of the year and turn its highly insulated back (U = 0.12) to the sun during the warmer months when heating isn't necessary. This significantly reduces heating and cooling requirements for the building throughout the year, which are provided for by a heat pump, while hot water is provided by vacuum-tube solar panels.

Photovoltaic solar panels with a rated power of 6.6 kW on its roof provide five to six times more energy than the building uses, making the building "energy positive" (PlusEnergy). To further improve energy generation, the panels also rotate independently of the building to follow the sun, while being able to adapt its orientation in case of strong winds.

Water usage and natural waste management

In order to limit water usage, a gray water circuit (for washing dishes and clothes) is used. Wastewater is purified in a vegetated cascade pond outside the edifice and it also collects rainwater.

Natural waste and excrement are dry composted in the structure as well.