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    MBH927's Avatar
    MBH927 Posts: 1, Reputation: 1
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    #1

    Jul 17, 2010, 10:20 AM
    Baseboard Heater - Rating are 208/240 or 240/277. With 240V service, Does it matter?
    Selecting Replacemet Heaters - Voltage Rating choices.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Jul 17, 2010, 10:43 AM

    It might.

    It's pick the 208/240 because likely the mfr chose the midpoint as the resistance of the heaters to size them at. (240-208).

    The wattage has to be slightly different for each voltage: 208, 240, 277. Assuming R is constant at a given temperature. P(watts) = V^2/R where R is resistance in ohms.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #3

    Jul 18, 2010, 06:49 AM
    Yes it matters, 240-208 volt rated units used on a 240 volt service will operate at full power.

    277-240 volt units used on 240 volts will not.
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