Electric Water Heater Amperage
The amperage of an electric hot water heater is governed by the wattage of the heating elements and the voltage that is applied to them.
Electric water heater amperage. Should you decide to go with electric tankless water heaters you must take a look at the following facts. Multiply the current rating of the water heater with 125. Now in order to choose an electric breaker multiply the current draw of the water heater with 125 per cent in order to determine the size of the breaker you will need.
Our 60 imp gal tanks have 4500 watt elements with 10 2 breakered at 30 amps. Our 40 imperial canadian gallon electric hot water heaters roughly equivalent to the us 50 gal units have 3000 watt elements only and are breakered at 20 amps while using 12 2 wire. Electric water heater repair kit https amzn to 30ysvxk in this video.
Why the 4500 watt elements in a similarly sized unit faster recovery times. Lower wattage heats more slowly. A standard electric tankless water heater needs at least 120amps to run and the total capacity for an average home is 200amps.
You have stated that the calculated amperage load for 4500watt at 240volts is 18 75amps however nec article 422 13 states that the minimum circuit rating for a water heater must be 125 of the rated load so this 4500watt load requires a minimum circuit of 23 44 amps at 240volts. Water heaters running on 120 volt power have a long recovery time which is impractical for most households. Only for peak hours.
Dale if you have a gas water heater then the plug is providing power for the vent exhaust fan therefore it is on a shared circuit. Save water heater costs during peak electric pricing by converting water heater to 120v. It still takes same amount of energy to heat.
However if you are adding outlets to the basement you should consider installing a separate circuit for the new outlets. Electric consumption spreads across more hours. Not recommended for ordinary household usage.
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