Very much like an electric stove. Electricity is passed through a resistive coil, which gets hot. The coil is immersed in a tank of water, so the heat is transferred, by conduction, to the water around it.
Basically a water heater is a big water tank with insulation wrapped around it. cold water will then flow into it and will activate a thermostat. The thermostat will then either kick on an electric...
Hot water tanks Amps = Watts/Voltage. 4500/240 = 18 amps. You would use a #12 copper wire which is rated at 20 amps. On a hot water tank there is only one of the elements on at a time. The incoming...
A water heater heats the water to a very high temperature. This water is combines with normal temperature water to allow you control how hot or cold you would the water to be.