Generally, no, you should not attempt to drain a leaking water heater unless you are specifically preparing the unit for complete removal and replacement by a professional plumber. Draining a tank with an active bottom leak is unnecessary and will not stop internal structural failures. Furthermore, if you drain an electric water heater while power remains active, or if you drain a gas unit incorrectly while sediment clogs the drain valve, you risk damaging heating elements or flooding your utility space. Verification: Shut off the cold water inlet valve and power source instead of draining.
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