Laurence’s research is motivated by improving the efficacy of heat pump roll out in the UKs domestic heating sector, whereby the vast majority of installations will require replacing boilers in existing dwellings. Often, when replacing a boiler with a heat pump, radiators, which constitute the most common “heat distribution system” in the UK, are re-sized to work at the lower flow temperatures with which heat pumps operate, adding to the costs and disruption of installation. Currently, the methods used in this radiator re-sizing process have not been tested against measurements of real radiator performance, providing uncertainty in its necessity and accuracy of specification. Hence, Laurence’s PhD is addressing this research gap by using a data-driven approach to investigate the suitability of existing heat distribution systems, their impact on heat pump performance, and their relation to the whole building system. This approach will be compared to existing design methods, where insights could be applied towards improving existing methods, as well as, clarifying the use case for data-driven design of heat pump heating systems. The research is sponsored and supported by Passiv UK.