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    fmiro's Avatar
    fmiro Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Apr 1, 2014, 08:47 AM
    Replacing a 4500 watts water heater for a 11 kw tank less water heater. Any problem?
    The water heater in my house 4500 watts @ 230v. I am replacing it with a Titan tank less water heater model N-120, which is rated at 11 KW @ 230 V. My main beaker is 150 amps, the panel is rated at 200 amps. Any problems with the main breaker?
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Apr 1, 2014, 09:13 AM
    The only thing I question is whether an 11kW heater will keep up. Most whole house units are far bigger.
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
    Ultra Member
    		  
    #3

    Apr 1, 2014, 09:35 AM
    along with Stan's comments, you may be ok as the load for 11kW @ 240 is 46 amps.
    Now, what you don't know is the load of everything else...
    If you are already at 80% load you may be overloading your service...
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #4

    Apr 1, 2014, 05:20 PM
    If you have 150 main, the panel may be rated for 200 but you won't get more than 150. That's a lot of draw for 150 Amps.
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #5

    Apr 2, 2014, 05:47 AM
    Why? Electric tankless heaters are energy hogs, not savers. And as stanfortyman said, it may not be enough. An 11K heater is half of what most tankless heaters are for residential use.
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