Heated mirror pads

Discussion in 'Electricians' Talk' started by lolhandy, Aug 13, 2012.

  1. lolhandy

    lolhandy New Member

    Can anyone tell me how much power heated mirror pads use?  Ideally in laymans terms - i.e. pounds, shilling and pence.  So, for example, if one of these is hooked up to the lighting circuit and someone takes a 20 mins shower, what would the cost be to use?
  2. seneca

    seneca Screwfix Select

    You need to look-up what the wattage rating is and work it out from there.
  3. lolhandy

    lolhandy New Member

  4. unphased

    unphased Screwfix Select

    Hi

    just checked out the info. The demister pad becomes effective after 2/4 minutes. It is 25W.

    25W over a 20 min period is 20/60h x 0.025kW=0.0083kWh

    If you look up the rate you pay per kWh and multiply it by 0.0083 that will tell you how much it costs. ie If ,say, your rate is 20p per kWh then 20 x 0.0083 = 0.17p.

    :)
  5. lolhandy

    lolhandy New Member

    Thank you very much.  I'm OK at DIY, but not great working out all the electrical bit!  Thanks for explaining - looks like the other half will insist on the pad :(
  6. J.P.

    J.P. New Member

    Hooked up to the lighting circuit
  7. Lokkars Daisy

    Lokkars Daisy New Member

    laymans terms
  8. Lectrician

    Lectrician Screwfix Select

    As UP calculates.

    I would do it slightly differently, although only to make it clearer in my mind.

    You pay 20p (say) per unit of electricity.  A unit of electricity is 1 kilowatt for 1 hour, (or half a kilowatt for 2 hours, or 2 kilowatt for half an hour).

    This unit is known as a KWh (Kilowatt Hour).

    To work out the cost, multiple the KW of the appliance (the wattage devided by 1000) and multiply this by the number of hours and the pence per unit.

    25watt / 1000 = 0.025KW

    0.25KW * 1hour * 20pence = 0.5pence  (thats 25watts running for a whole hour)

    0.5pence / 60minutes = 0.008333333333333333333pence per minute
    0.008333333333333333pence * 20minutes = 0.166666666666667pence.

    So, 0.17p per 20 minutes.

    Same result, swings and roundabouts :)

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