Given the lack of data on heat pump performance in customers’ homes, the Energy Saving Trust in partnership with the Open University undertook the first large-scale heat pump field trial in the UK to determine how heat pumps perform in real-life conditions. The year-long field trial monitored technical performance and customer behaviour observed at 83 sites across the UK. The findings provide valuable information about the factors that affect the success of a domestic heat pump installation. Instead of revealing outcomes along statistical grounds, or acting as a “brand-vs-brand” competition, the field trial findings provide a discussion of key points of interest to potential consumers, including:\ud • Measured coefficient of performance (COP) and system efficiency\ud • Installation practices (both system design and performance)\ud • Customer behaviour (contribution by the Open University)\ud • Heating patterns and average internal temperatures\ud • Economics\ud This report makes recommendations for consumers, installers, manufacturers and policy makers, and identifies areas that require additional investigation and research
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