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A 5.5-kW water heater operates at 240 V. i. Should the heater circuit have a 20A...

A 5.5-kW water heater operates at 240 V.

i. Should the heater circuit have a 20A or a 30A circuit breaker? [2 marks]

ii. Assuming 85% efficiency, how long will the heater take to heat the water in a 0.2085-m3 tank from 20°C to 80°C? The density of water is 1,000 kg/m3 and the specific heat capacity is 4,200 J/kg/°C.

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