water tank heaters for winter

Discussion in 'Motorhome Chat' started by pappajohn, Jan 16, 2010.

  1. pappajohn

    pappajohn Funster Life Member

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    this tip was mentioned in a post by Snowbird a couple of weeks ago and i thought it worth another mention.

    a cheap option is a fishtank heater.

    they are usually 150w @ 230v but could be run on a small inverter when driving or off hookup.
    100% submersible and fully adjustable for temp + themostatic.

    the max power consumption is only 650miiliamp per hour so unless you park up for a number of days it shouldnt have a drastic effect on the leisure battery.

    cost.....£7 or £8 from most pet shops.
     
  2. Larrynwin

    Larrynwin Funster

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    A member on the sister site RVOC had some 12v self adhesive tank heaters 7.5 inch X 26inch at £35 each. They still appear to be for sale.
     
  3. hilldweller

    hilldweller Funster Life Member

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    Good idea apart from a tiny logical flaw -- that 650mA is at 240V, it's still 150W or 15A from you leisure battery.

    I'd add that unlike a fish tank we bounce our tanks around so you'd need to fasten it down securely.
     
  4. pappajohn

    pappajohn Funster Life Member

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    any idea of the wattage ?

    i would say for an average euro tank (80 to 100ltr) you would need at least a 100w heater in freezing conditions which, at 12v, will be 8.3 amps (150w = 12.5amps)
    fine if you're on hookup or on the move but a lot of power if you're wildcamping.
     
  5. pappajohn

    pappajohn Funster Life Member

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    :Doh:
    just checked it on my inverter.
    digital clamp meter and a 150w heater.......its drawing 17.5A on startup.
    forgot to do that simple convertion:Blush:

    still worth using when on the move on an inverter then on hookup once pitched.
    once its up to temp its thermostatic.
     
  6. hilldweller

    hilldweller Funster Life Member

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    You've had a hard week !

    Yes, definitely worth it.

    How bad is the water damage ?
     
  7. pappajohn

    pappajohn Funster Life Member

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    from another thread.....

     
  8. Macytia

    Macytia Read Only Funster

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    The minimum temperature seems to be 20 degrees, who needs a water heater:Rofl1:
     
  9. Kon tiki

    Kon tiki Read Only Funster

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    Our van has a heater for the waste tank as standard, I wonder what sort of power it uses as there is no info in the manual?
     
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