Turn off power at the breaker
Verify power is off with a voltage tester
Shut off the cold water supply
Open a hot water faucet to relieve pressure
Attach a hose to the drain valve
Drain the tank completely
Disconnect the electrical wiring at the junction box
Label the wires before disconnecting
Disconnect the hot and cold water lines
Remove any straps, brackets, or mounting hardware
Move the old water heater out
Position the new water heater in place
Level the new water heater
Reconnect the water supply lines
Install new dielectric unions or fittings if needed
Reconnect the electrical wiring
Fill the tank by turning on the cold water supply
Keep a hot water faucet open until air is purged
Check all connections for leaks
Restore power only after the tank is full
Set the thermostat to the desired temperature
Test hot water operation
Dispose of the old water heater properly