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    cjacoby's Avatar
    cjacoby Posts: 8, Reputation: 1
    New Member
    		  
    #1

    Mar 19, 2010, 02:18 AM
    How to Calculate Amp draw of pool pump and electric heater
    1.5 killowatt electric heater and 1hp 115v electric motor. Can both run on single 115v 20 amp breaker circuit at same time?
    cdad's Avatar
    cdad Posts: 12,700, Reputation: 1438
    Internet Research Expert
    		  
    #2

    Mar 19, 2010, 05:37 AM

    The standard is watts divided by volts equals amps.

    Does your electric motor have another rating besides HP rating?

    Just with the heater your at 10 amp already.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #3

    Mar 19, 2010, 06:53 AM

    The heater needs to be on a 20 AMP service by itself. That service has to be sized at 1.25 more than 1500/120.

    Is there any other info on the motor nameplate such as FLA?
    Motor breakers can be higher than the HP rating because of starting currents. They can differ based on motor construction.
    Dr_Spa's Avatar
    Dr_Spa Posts: 101, Reputation: 13
    Junior Member
    		  
    #4

    Mar 22, 2010, 06:44 PM

    NO! If it's a true 1hp motor you'd need a 25A circuit
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #5

    Mar 22, 2010, 08:03 PM

    Dr. Spa:

    Your unclear. What did the "NO" mean. I sized the heater only.
    Dr_Spa's Avatar
    Dr_Spa Posts: 101, Reputation: 13
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    #6

    Mar 22, 2010, 08:31 PM

    "1.5 killowatt electric heater and 1hp 115v electric motor. Can both run on single 115v 20 amp breaker circuit at same time?"

    NO
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