Immersion heater with plug-in timer?

Discussion in 'Electrics UK' started by Vicario, 7 Jun 2020.

  1. Vicario

    Vicario

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    When we have our new boiler fitted (later this summer) we have been advised to use our immersion heater for a few days. Problem is that it's plugged into a 13amp socket in the airing cupboard and hardly ever used. Can I use a timer in there for a week or so or is that dangerous?
    All the ones I've seen say not for immersion heaters but I reckon it will actually be timed on for about 4 hours each day.
     
  2. DetlefSchmitz

    DetlefSchmitz

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    You could consider just leaving it on. It will only heat the water when its temperature goes down. For one week it will be cheaper than buying, and perhaps installing a new timeswitch.
     
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  4. AndyPRK

    AndyPRK

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    or just turning it on once a day.

    a timer is OTT
     
  5. RF Lighting

    RF Lighting

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    The trouble with plug in timers is that generally they are built to a price, and they are normally used to switch things like lights and other smallish loads, so the manufacturers get away with using cheaper lower rated parts.

    If you plug in a heavy load such as immersion heater which can draw a large current for prolonged periods of time, there is a very good chance that the timer will either just fail, or there’s a chance it may go on fire.

    As others have said, leaving it plugged in will be the cheapest option. Once your tank is up to temperature, the thermostat in the heating element will click off and stay off for many hours as the large mass of water in an insulated tank takes a very long time to actually cool down.
     
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