How to Replace a 220/240-volt Electric water Heater

A water heater that leaks should be replaced immediately to prevent expensive water damage. Leaks occur because the inner tank has rusted through.

When replacing an electric water heater, make sure the voltage of the new model is the same as the old heater. Water heaters are available with tank sizes ranging from 30 to 65 gallons. A 40- or 50-gallon heater should be large enough for a family of four.

Energy-efficient water heaters have polyurethane foam insulation and usually carry an extended warranty. These models are more expensive, but over the life of the water heater they cost less to own and operate.

The pressure-relief valve usually must be purchased separately. Make sure the new valve matches the working pressure rating of the tank.

How to Replace a 220/240-volt Electric water Heater

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1. Turn off power to water heater by switching off circuit breaker (or removing fuse) at main service panel. Drain water heater and disconnect water pipes.
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2.Remove one of the heating element access panels on the side of the water heater.
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3. Wearing protective gloves, fold back the insulation to expose the thermostat. Caution: Do not touch bare wires until they have been tested for current.
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4. Test for current by touching probes of neon circuit tester to top pair of terminal screws on the thermostat. If tester lights, wires are not safe to work on; turn off main power switch and retest for current.
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5. Remove coverplate on electrical box, found at side or top of water heater. Disconnect all wires, and label with masking tape for reference. Loosen cable clamp. Remove wires by pulling them through clamp. Remove old heater, then position new heater.
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6. Connect water pipes and pressure-relief valve, following directions for gas water heaters. Open hot water faucets throughout the house, and turn on water. When water runs steadily, turn off faucets.
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7. Remove the electrical box coverplate on new water heater. Thread the circuit wires through the clamp. Thread circuit wires through the cable opening on the water heater, and attach clamp to water heater.
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8. Connect the circuit wires to the water heater wires, using wire connectors.
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9. Attach bare copper or green ground wire to ground screw. Replace coverplate.
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10. Remove access panels on side of water heater (steps 2 to 3), and use a screwdriver to set thermostats to desired water temperature.
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