To maximize hot water output and prevent overloading your tankless water heater, you should reduce simultaneous hot water fixture usage, clean the cold water inlet filter screen, and descale the heat exchanger to restore maximum thermal transfer efficiency. Operating too many heavy appliances at once exceeds the unit's maximum Gallons Per Minute (GPM) heating capacity. Verification: Measure output temperature while running only a single shower or faucet to confirm improved thermal performance.
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