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In Rhein-Erft-Kreis, 33 ZEWO LAMBDA heat pumps using propane (R290) replaced gas and oil heating in 24 multi-family buildings (~300 apartments) within 10 weeks. The project was delivered under an inter-building contract heating model by ZEWOTHERM, vaestro, and Wohnungsgesellschaft Erftland.
ZEWOTHERM will present at GET NORD in Hamburg (19–21 November, Hall A1, Stand A1.140) its expanded range of fully modulating air-source heat pumps ZEWO ALPHA running on propane (R290), the split combined storage tank ZEWO Copar, and the prefabricated energy station ZEWO PowerCube for serial heating replacement in multi-family and municipal buildings.
In the Stiftung Warentest 2025/2026 test, the Lambda EU10L (10 kW) received the highest rating among ten air-source heat pumps. According to Lambda, competing units consumed on average 20% more electricity. The model also ranked among the quietest and earned a "very good" (1.4) score for ease of operation.
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