{"id":3550,"date":"2026-03-17T11:50:01","date_gmt":"2026-03-17T11:50:01","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/project62\/?post_type=case_studies&p=3550"},"modified":"2026-03-17T11:50:02","modified_gmt":"2026-03-17T11:50:02","slug":"de010-hemer-germany","status":"publish","type":"case_studies","link":"https:\/\/heatpumpingtechnologies.org\/project62\/case-studies\/de010-hemer-germany\/","title":{"rendered":"DE010 Hemer, Germany"},"content":{"rendered":"
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Full renovation and new, clean heating<\/strong><\/p>\n<\/div>\n\n

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The aim of this project was to protect the climate, increase security of supply and strengthen regional value creation at the same time.<\/p>\n<\/div>\n\n

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When you\u2019re looking for a new flat to rent, the heating costs matter. In Germany\u2019s western Sauerland region, non-profit housing association Hemer eG knew this, and made sustainable and affordable heating a priority when renovating a residential building in Hemer.<\/p>\n<\/div>\n\n

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It decided to put in nine decentralised ventilation heat pumps, one per apartment \u2013 covering 616 m\u00b2 of living space – to be used both for ventilation and for hot water from recovered waste heat. A modern air-to-water heat pump provided central underfloor heating. These replaced the old water heater and gas condensing technology.<\/p>\n<\/div>\n\n

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Key Facts<\/strong><\/p>\n<\/div>\n\n

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Buildings<\/strong><\/td><\/td>Heat Pump and Source<\/strong><\/td><\/td><\/tr>
Location<\/td>Hemer, Germany<\/td>Number of HPs<\/td>9+1<\/td><\/tr>
Construction<\/td>1952<\/td>recovered waste<\/td>recovered waste heat + air<\/td><\/tr>
Project type<\/td>retrofit<\/td>Type of system<\/td>individual<\/td><\/tr>
Heated distribution<\/td>underfloor<\/td>Capacity<\/td>40kW<\/td><\/tr>
Heated space<\/td>616 m\u00b2 total<\/td>Model<\/td>Dimplex LA 40TU<\/td><\/tr>
No. of aparments <\/td>9<\/td><\/td><\/td><\/tr>
Insulations<\/td>retrofitted<\/td><\/td><\/td><\/tr>
<\/td><\/td><\/td><\/td><\/tr>
Space and Domestic hot water
heating<\/strong><\/td>		<\/td><\/td><\/td><\/tr>
Heating temperature<\/td>35\u00b0C<\/td><\/td><\/td><\/tr>
Heat output via<\/td>underfloor heating <\/td><\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n
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Description of the technical concept<\/strong><\/p>\n<\/div>\n\n

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The advantages of the compact hot water ventilation system made it easy for the installer: no new hot water pipes had to be laid through the entire building; instead, preparation and extraction are each located within one flat. This also greatly reduces energy losses. The short distances also made it unnecessary to install circulation pipes.<\/p>\n<\/div>\n\n

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“The house was built in 1952 and was half empty, That’s why we carried out a full refurbishment and rebuilt the staircases.” – Peter Meyer, spokesman for the Board of Directors of Hemer eG.<\/p>\n<\/div>\n\n

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“The flats, which range in size from 50 to 110 m\u00b2, have been fully rented again since the first ‘groundbreaking’ of the project. In addition, the tenants feel very comfortable in their new home, also due to the good indoor climate,” – Peter Meyer<\/p>\n<\/div>\n\n

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Case study delivered by: European Heat Pump Association<\/em> <\/p>\n<\/div>\n\n

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