New electric water heater


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Old 03-11-08, 11:33 PM
K
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New electric water heater

I purchased an add on 20 gal electric 120 volt hot water heater. It requires 10/2 wiring and 25 amp CB. Of course Siemens does not make a single pole 25 AMP CB. I was told a double pole 30 amp will work and to run the wht to one CB terminal and blk lead to the other CB terminal and the bare ground wire to the ground bus. I need to confirm the wiring to keep it 120v.
 
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Old 03-12-08, 02:44 AM
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By doing what you are describing, you will be hitting that water heater with 240 VAC. Each pole of that breaker will give you 120 volts separate of the other so you would be energizing the hot side of the heater with 120 and the neutral side with 120 volts.

It will be a sure fire way of burning up the hot water heater.

You may want to consider posting your problem in the electrical section of the forums where someone will be more likely to help you with the proper way to wire this heater.
 
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Old 03-12-08, 10:42 AM
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What hank said.

Look around and get a different water heater that will work.

I have flown in the kc135 on deployments. Best spot is the glass belly.

Good Luck!
 
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Old 03-12-08, 07:58 PM
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I turned it off at the breaker after posting last night. It just did not sound right, what I was told or I miss under stood. Managed not to trash the heater and found a single pole 30 amp that will work.
 
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Old 03-13-08, 04:57 AM
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I have an additional question. Why did you buy such a small water heater, and why 120 volts. You would have been better off with a 240 volt unit and a little larger water capacity if you are trying to boost what you already have. Are you running these water heaters in series or parallel?
 
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Old 03-13-08, 07:10 AM
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I'm running them in series. 120V is what the smaller tanks run on. Basically it's a cheap way to keep an extra 20 gallons in addition to the 50 I already have. The electric should only kick in to keep the 20 hot and when the 50 runs out. The 50 gal is gas so it kicks in 1st. When it runs out I have an additional 20 while the gas is 1st to recover since it's more efficient. I did not see the need for 30-50 gallons of hot water. Just enough to compensate for morning family surge.
 
 

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