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The amperage of a water heater is governed by the wattage of the heating elements and the voltage that is applied to them. Amps = Watts/Volts. Once the amperage is calculated, the size of the fuse can be determined.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

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12y ago
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9y ago

It depends on the power of the water heater (in watts).

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Q: What size fuse in amps should a hot water heater have?
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