Replacing a standard residential water heater typically takes between two to four hours for a professional plumber working in an accessible location. This timeframe covers draining and removing the old tank, positioning the new unit, re-connecting water and gas or electrical lines, installing required safety valves, and testing the system. If the replacement involves complex code upgrades—such as adding a thermal expansion tank, upgrading gas lines, modifying rigid flue venting, or switching from an electric tank to a complex hybrid heat pump system—the installation can easily extend across a full working day.
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