Yes, you can still flush your toilet while your water heater is being replaced, as long as the plumber only shuts off the specific water supply valves feeding the water heater rather than your home's main water supply. Modern toilets draw cold water independently from the main supply line. However, if the plumber must shut off your entire house water supply to perform major pipe modifications, your toilet will only flush once using the remaining water stored in the tank. Verification: Test the toilet flush handle after isolating the water heater to confirm normal operation.
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