# double check my amps calculations

Discussion in 'General Electronics Chat' started by ozzylr, May 7, 2015.

1. ### ozzylr Thread Starter New Member

May 7, 2015
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I am installing a tank heater which stated a 10000 watt heater. It has a 220 plug so ifPower equals E x I then I equals W/E or in this case 10000/220. Am I right.? Does the fact that the 220 is made up of 110 on each leg affect the formula or the overall current?

2. ### Dodgydave Distinguished Member

Jun 22, 2012
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10Kw @ 220V = 45.4amps,

Last edited: May 7, 2015
3. ### AnalogKid Distinguished Member

Aug 1, 2013
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No. 10 kW / 220 = 45.5 A. I'd say to use a 50 A breaker. but more experienced hands around here might recommend 60 A.

ak

Jan 15, 2015
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Here in the US for a 10 KW heater load I would run a 240 VAC 60 Amp service disconnect fusible type (2 fuse) 3 wire using AWG 6 3 conductor. Your current will be as Analog stated 10 KW / 240 V = 42 Amps or if the mains voltage for your location is 22 then about 46 Amps. Just make sure for your local you use a correct wire gauge for the load and meet any other building or code requirements.

Ron

5. ### dl324 Distinguished Member

Mar 30, 2015
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How is the thermostat wired? Most residential will only operate one heating element at a time (top then bottom).