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Old 27-03-2016, 07:44   #1
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Hot water tank

Can I convert my hot water tank from 220v to 110v and have it run on my Yamaha 3000watts gen?
or I just need to buy a new one any advise will be appreciated
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Old 27-03-2016, 08:04   #2
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Re: Hot water tank

AFAIK a water heater is just a resistance load and all it cares about is watts. So at 110V it will draw twice the amps it draws as at 220V, and you will likely have to beef up the electrical cables.
That said I would check with the manufacturer. The internals of the heater may have limitations on the amount of amps it can handle.

John
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Old 27-03-2016, 08:15   #3
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Re: Hot water tank

At 120 volts, a 220 volt heating element will get barely warm and it will take days to make hot water. You need to find a 120 volt element for the water heater. It still won't heat water as fast as it does on 220 volts now but it will work.
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Old 27-03-2016, 11:01   #4
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Re: Hot water tank

Quote:
Originally Posted by jstevens View Post
AFAIK a water heater is just a resistance load and all it cares about is watts. So at 110V it will draw twice the amps it draws as at 220V, and you will likely have to beef up the electrical cables.
That said I would check with the manufacturer. The internals of the heater may have limitations on the amount of amps it can handle.

John
You are mistaken. The constant is resistance, not power. As you drop voltage to one half, resistance stays the same, current drops by one half and power drops by three quarters.

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Old 27-03-2016, 11:08   #5
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Re: Hot water tank

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Originally Posted by svlamorocha View Post
You are mistaken. The constant is resistance, not power. As you drop voltage to one half, resistance stays the same, current drops by one half and power drops by three quarters.

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^^+1. Correct!

Change out the 220V element to a 1.2kw 120V element. That will be a 10 amp load to the genny. Then the small generator will run it and will heat 5 GPH to 100 degree F. rise. Important. You may need to upsize the circuit wiring if its smaller the 14 gauge.
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Old 27-03-2016, 11:35   #6
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Re: Hot water tank

Jeez, I am getting old. Couldn't remember V=IR.

John
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Old 27-03-2016, 13:35   #7
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Re: Hot water tank

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Originally Posted by sailorchic34 View Post
^^+1. Correct!

Change out the 220V element to a 1.2kw 120V element. That will be a 10 amp load to the genny. Then the small generator will run it and will heat 5 GPH to 100 degree F. rise. Important. You may need to upsize the circuit wiring if its smaller the 14 gauge.
i will try to found that 1.2 kW element for my tank

Thank you every one for your help
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