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-   -   single pole vs. double pole circuits (http://www.diychatroom.com/f18/single-pole-vs-double-pole-circuits-23997/)

DannoW 07-20-2008 11:16 PM

single pole vs. double pole circuits
 
i am wiring a new water heater that calls for 4 40 amp or 2 75 amp circuits. Am i able to use single pole 40 amp circuits with #8 wire, or do I need to use double pole 40. I dont want to use the 75 amp due to the #4 wire I would have to use, and I dont want to use 8 slots in my box for the 4 double pole 40s. What do I do?

Thanks,

DannoW

Cow 07-20-2008 11:59 PM

Quote:

Originally Posted by DannoW (Post 141303)
I dont want to use the 75 amp due to the #4 wire I would have to use, and I dont want to use 8 slots in my box for the 4 double pole 40s. What do I do?

Pick one, those are your choices.

Pudge565 07-21-2008 12:01 AM

what does the owners manule say? By what you describe I take it that this is an ondemand water heater? If so from what I read on here in other threads that you need at least a 200 amp service for those. But back to your question I think it would need double pole breakers.

frenchelectrican 07-21-2008 12:14 AM

What model number of this tankless waterheater is ??

and are you in USA or Canada ? there is two diffrent codes on this one.

Merci,Marc

Speedy Petey 07-21-2008 07:03 AM

Quote:

Originally Posted by DannoW (Post 141303)
What do I do?

Thanks,

DannoW

Get rid of that #$%&* tankless electric water heater!


Don't dealers of these things go over this stuff before hand to let folks know what a hassle it can be???
Oh yeah, duh, they might not make the sale that way.

nap 07-21-2008 07:13 AM

the theory of these things is great.

that is where things end from what I see. The power requirements, either electrical or gas, often require such major work, the installation costs a fortune. On top of that, it seems they are not all they are cracked up to be. Too many folks either not setting then correctly, not understaning their limitations, or not buying a large enough unit.

BigJimmy 07-21-2008 09:36 AM

Quote:

Originally Posted by nap (Post 141365)
not buying a large enough unit.

I think that this is the biggest problem.

I considered installing a natural gas unit. No picnic!

frenchelectrican 07-21-2008 10:20 AM

Somehow what.,, the Gaz fired units seems better than electric unit due the BTU rating and yeah of course you will hit the snag with gas system you will probly a good chance need to upgrade the pipeing system and Of course the gaz metering device it will have up upsized anyway.

Merci,Marc


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