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single pole vs. double pole circuits

4K views 7 replies 7 participants last post by  frenchelectrican 
#1 ·
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
 
#3 ·
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.
 
#5 ·
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.
 
#6 ·
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.
 
#8 ·
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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