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Old 08-13-2012, 02:55 PM   #1
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Water Heater Electrical Requirements


I got a free water heater from my electric company and am trying to install it. My weak point(more like no clue) is the electrical part of the installation. I was installing it in a utility room that has 2 220V plugs.

Is there a way to use that plug or the wiring from that plug to hardwire the water heater? I just spent a fortune upgrading the wiring and I didn't think about this when they were out because I was going to get gas.

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Old 08-13-2012, 03:11 PM   #2
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I would say hard wire it. Are the recepticles 30amp?

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Old 08-13-2012, 03:22 PM   #3
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Water Heater Electrical Requirements


Yeah, it is. I'm trying to cheat the system somewhat. My electric company offers a free water heater and my gas company offers $800 to switch to a tankless. I'm trying to get this up so my electrical company is happy and then converting to a tankless.

I may end up keeping the electrical heater if it is sufficient though. My box is full and the electrical company wanted $1000 to add a subpanel.
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Old 08-13-2012, 03:40 PM   #4
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Well if the recepticle is near the water heater, you could remove it and put in a junction box.
Then run 10/3 from j box to water heater.

If the panel is nearby, it would be best to run new 10/3 from the existing 30amp 2 pole breaker.
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Old 08-13-2012, 04:38 PM   #5
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Well if the recepticle is near the water heater, you could remove it and put in a junction box.
Then run 10/3 from j box to water heater.

If the panel is nearby, it would be best to run new 10/3 from the existing 30amp 2 pole breaker.

Is there a safe way to add more of the same wire so that I have enough from the j box to the water heater? It's new wiring so I'd be able to get the exact same wire but as far as connecting them. On my jeep I'd use electrical tape but obviously you would not use that in this situation.
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Old 08-13-2012, 04:49 PM   #6
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Water Heater Electrical Requirements


Yes, it should be #10/3. That is two hots, one grounding conductor, and bare ground. 4 wires, black red white bare.
Get the length you need to run from the j box to the water heater. Obiously not straight, the wire must be secured from A to B.

Yah, black tape is not sufficient. Use proper sized wire nuts instead.
Also if the j box is metal you must attach a piece fo bare copper to a ground screw(sold separately) on the metal box.
Then twist together this "pigtail" with the other two bare copper wires, and nut them.

When nutting wires, use linesman or needlenose pliers to twist them together first.
Simply putting a wire nut on is not sufficient to hold wires together.
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Old 08-13-2012, 04:51 PM   #7
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Water Heater Electrical Requirements


A water heater should only need a 10/2.
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Old 08-13-2012, 05:03 PM   #8
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A water heater should only need a 10/2.
and a disconnect if not within sight of the panel
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Old 08-13-2012, 05:05 PM   #9
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When nutting wires, use linesman or needlenose pliers to twist them together first.
Simply putting a wire nut on is not sufficient to hold wires together.
You will get more than a few different opinions on that comment. BTW I twist but many do not.
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Old 08-13-2012, 05:31 PM   #10
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You will get more than a few different opinions on that comment.
After we're done with that debate, can we go to the plumbing section and ask if the toilet flange should be flush with the finished floor or on top?
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Old 08-13-2012, 06:32 PM   #11
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Simply putting a wire nut on is not sufficient to hold wires together.
Actually it is. Most wire nuts do not require pre-twisting, and to prove it to yourself, twist one on without pre twisting and then remove the wire nut, you will be impressed how nice it came out.

BTW, I twist sometimes, usually out of habit from being in the trade (x) amount of years.
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Old 08-13-2012, 07:30 PM   #12
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Actually it is. Most wire nuts do not require pre-twisting, and to prove it to yourself, twist one on without pre twisting and then remove the wire nut, you will be impressed how nice it came out.

BTW, I twist sometimes, usually out of habit from being in the trade (x) amount of years.
I agree with you. I like to throw that in for noobs in case they use junk nuts, or dont nut wires well. Especially on a hot water heater.
Glad u guys chimed in anyway
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Old 08-13-2012, 07:31 PM   #13
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I agree with you. I like to throw that in for noobs in case they use junk nuts, or dont nut wires well. Especially on a hot water heater.
Glad u guys chimed in anyway
Funny... but I agree with your logic.

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