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The efficiency of residential heating systems is influenced by more than the boiler’s combustion performance. Key factors include emitter efficiency, system water quality, circulation rates, insulation, ventilation, and environmental conditions. Many of these are interdependent, making controlled efficiency studies difficult. This trial simplifies the evaluation by focusing on measurable parameters before and after cleaning, including: This trial was conducted to evaluate the impact of system cleaning using Fernox Cleaner F3 on the efficiency of a residential hydronic heating system. Testing was performed in an occupied residential property without modifications to the boiler or system configuration. Results showed a 20.4% reduction in time to reach boiler high limit temperature and an