CC BY 4.0Fischer, MarieMarieFischerHerceg, SinaSinaHercegWeiß, Karl-AndersKarl-AndersWeiß2024-09-182024-09-182024https://publica.fraunhofer.de/handle/publica/475247https://doi.org/10.24406/publica-367310.52825/isec.v1i.115710.24406/publica-3673As there is currently a lack of reliable guidance for investors to make the most sus-tainable choice when it comes to different renewable heating technologies for residential buildings, this contribution presents a methodological approach for a comprehensive compari-son, while also addressing data requirements. A focus point of the methodology development and the sustainability assessment lies on the integration of a dynamic electricity mix to ac-count for the continuous decarbonization in an energy grid that is more and more based on renewables. Its influence on the final environmental impact results of the presented exempla-ry system combining a solar thermal collector and an air source heat pump is assessed. The results indicate a significant influence of the electricity mix on the carbon footprint (- 48%) of the provided heat. The resource use is only slightly changed (+ 3%).enLife Cycle AsessmentHeat PumpSolar Thermal SystemElectricity Mixconference paper