The ideal recommended temperature setting for a residential tankless water heater is 120°F (49°C) under normal operating conditions. Setting the thermostat to 120°F provides plenty of hot water for domestic tasks, prevents scalding injuries particularly for children and elderly occupants, and minimizes standby energy consumption as well as mineral scale precipitation. If you require higher temperatures for commercial dishwashers, you can adjust it up to 140°F with caution. Verification: Measure water temperature at the nearest tap using a digital kitchen thermometer to confirm it reads 120°F.
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