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    Mr.C.'s Avatar
    Mr.C. Posts: 1, Reputation: 1
    New Member
    		  
    #1

    May 4, 2011, 05:03 PM
    Wire gauge water heater
    Looking at an on-demand water heater rated at 240V 27A. Have previously wired 10/2 MC wire and 2pole 30A breaker on a 208V bus. Service is 3 phase into sub-panel. Do not want to re-wire, can I just upgrade breaker to a 35 amp?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    May 4, 2011, 08:07 PM

    No can do, 10 gauge is only rated for 30 amps. If you increase the breaker to 35 amps without changing to 8 gauge wire you make the wire the weak link and could cause a fire. Copy this chart somewhere for future use.
    #14 15 A. 15 A.
    #12 20 A. 20 A.
    #10 30 A. 30 A.
    #8 45 A. 40 A.
    #6 65 A. 60 A.
    #3 105 A. 100 A.
    The center column is for copper wire and the right column is aluminium
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