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![Ignore the efficiency claims made by heat pump [water heater] manufacturers". No standard reporting temps for COP. Huge COP range vs temps. : r/heatpumps](https://external-preview.redd.it/ignore-the-efficiency-claims-made-by-heat-pump-water-heater-v0-7syHBixjQM-Y6V8pjdAQJXapMGjXorKtn-xdoIjt7VI.jpg?width=640&crop=smart&auto=webp&s=500f35c4d62bb96fd284193587fdaa1f84508767 "Ignore the efficiency claims made by heat pump [water heater] manufacturers\". No standard reporting temps for COP. Huge COP range vs temps. : r/heatpumps")