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Old 08-24-2013, 11:56 AM   #1
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Water Heater Breaker


I'm replacing my 20 year old 45 gal water heater with a new 80 gal unit. Both are 4500 watts. Currently I have a 20 amp breaker, which works fine. The manual for the new unit calls for a 25 amp breaker. Is there any reason to replace my 20 with a 25, if the 20 isn't tripping? Wire is 10/2 nm-b.

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Old 08-24-2013, 12:02 PM   #2
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Need to change the breaker.

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Old 08-24-2013, 12:06 PM   #3
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Quote:
Originally Posted by joecaption
Need to change the breaker.
Can I go to 30 amp since that is all that is available locally (even at electrical supply shop). Or must I get 25 amp?

Last edited by daveplot; 08-24-2013 at 12:10 PM.
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Old 08-24-2013, 12:12 PM   #4
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That water heater should be on a 30 amp circuit. Two pole 240 volts.

There is no such thing as a 25 amp breaker. So you go up to the next size. 30.

You have the right size wire by the way.
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Old 08-24-2013, 12:22 PM   #5
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Quote:
Originally Posted by J. V.
That water heater should be on a 30 amp circuit. Two pole 240 volts.

There is no such thing as a 25 amp breaker. So you go up to the next size. 30.

You have the right size wire by the way.
A GE THQL2125 would be the 25 amp breaker for my application, which I can get Tuesday, but I can do the swap this weekend with a THQL2130 from a local store.
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Old 08-24-2013, 02:56 PM   #6
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Water Heater Breaker


Quote:
Originally Posted by J. V. View Post
There is no such thing as a 25 amp breaker. So you go up to the next size. 30.
Haha, I thought the same thing when the inspector said I needed a 25 amp breaker for my A/C! I was surprised when I found they do exist, though only online it seems!

Knowing that the 25 amp breaker exists, i'd install the 25 amp breaker...
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Old 08-24-2013, 03:46 PM   #7
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Since a 30 amp breaker is fine for #10 cable, I would use the locally available (and cheaper) 30 amp as opposed to a special order 25 amp.

And would not think twice about it.
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Old 08-24-2013, 04:06 PM   #8
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It sounds to me that the NEC would permit either 25 or 30 wouldn't it?

422.13 states 125% which would be 25 amps
422.11(E)(3) states 150%, which would be 30 amps

The panel/circuit is from the 70s... So I'm assuming old code stated the current 20 amp breaker is ok.
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Old 08-24-2013, 04:14 PM   #9
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A 25 or 30 amp breaker will be fine.

All manufacturers make 25 amp breakers now.
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Old 08-24-2013, 04:18 PM   #10
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The 20 amp breaker never would have been code compliant

4500 / 240 = 18.75 amps x 125% = 23.5 amps.

Minimum breaker 25 amps (most common 30 amps)
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Old 08-24-2013, 05:05 PM   #11
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Quote:
Originally Posted by wirenut1110 View Post
A 25 or 30 amp breaker will be fine.

All manufacturers make 25 amp breakers now.
They have for as long as I have known. A real supply house will have them in stock in the brand of their choice.

But I agree. A 30A is FINE and typical for a 4500 watt water heater. I cannot think of any reason why a mfg would call for a 25A if #10 is used.
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Old 08-24-2013, 05:34 PM   #12
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go to the local lowes..or hd get a 30 amp breaker for your new water heater project complete...ben sr
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Old 08-24-2013, 08:37 PM   #13
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Quote:
Originally Posted by J. V. View Post
That water heater should be on a 30 amp circuit. Two pole 240 volts.

There is no such thing as a 25 amp breaker. So you go up to the next size. 30.

You have the right size wire by the way.
Yes you can actually get 25 amp 2 pole breakers,I argued with a guy one time for an hour saying you couldnt get one either.
Next time I was at the homeless depot after that little discussion I actually saw one on the shelf!
Boy did I feel like a dumbass,of course I always used 30s anyway since I kept them on my van.
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Old 08-25-2013, 08:16 AM   #14
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25A is a standard breaker size according to the NEC...I should hope they make 2P 25A breakers.
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Old 08-25-2013, 07:52 PM   #15
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I use `em all the time:


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