Fresh & Grey Water Tank Heaters

Discussion in 'Tech/Mech General' started by veletron, Feb 7, 2010.

  1. veletron

    veletron Read Only Funster

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    Hi

    I've heard of people fitting 12V, ~30W tank heaters to their underslung grey water tanks to prevent freezing in cold weather. I've had a wee google, but am unable to source such a beast. Is anyone able to provide the name of somewhere that sells them?

    Cheers

    Nigel
     
  2. Terry

    Terry Funster

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    Try looking for fish tank heaters :thumb:
    terry
     
  3. Terry

    Terry Funster

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  4. Douglas

    Douglas Read Only Funster

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    Hi Nigel, dont forget that a 30w heater will take 2.5 amps/hour from your battery. Thats 60amps/day. not very practical!

    Doug...
     
  5. Larrynwin

    Larrynwin Funster

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    KWKPR a member on www.rvoc.co.uk listed under classified, mhf sister site has some 12v American self adhesive tank heaters for sale 26" X 7 1/4" £35 each
     
  6. activecampers

    activecampers Read Only Funster

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    cak tanks ( www.caktanks.co.uk ) sell them
    I only have it installed in fresh (DIY) and insulated. Waste - erm....
    Think its 2A drain but on thermostat. It was absolutely needed on our last trip (mainly wild) and also when snowboarding (hookup) and did the job.
    But yeah - will kill batteries if you aren't driving every day or on hookup
     
  7. veletron

    veletron Read Only Funster

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    Thanks

    Hi

    Thanks all for the responses. Aye, I am aware of the current drain, but they are usually on a thermo, or I will just stick it on a switch (and fuse it), and remember to turn it off! In the recent cold weather, it would have been working all the time me thinks to keep the tank from freezing.

    The fresh tank is inboard, next to the boiler, so leaving the boiler on low does the trick to keep that from freezing.

    We almost always wild-camp (way too tight to pay £12-£20/night for a patch of grass, and some water!). We're pretty well kitted out for wild camping with 3x100AH batteries, 130W solar panel and a 50A sterling B2B charger.

    We use the van all year, heading north from home in Stirling. We're into all things outdoors all year around: hill walking, skiing, snowboarding, climbing, etc which sees the van surviving some harsh temperatures hence the need to stick a heater in the tank - although it might not get turned on until we return home and need to defrost the waste tank!

    Nigel
     
    Last edited: Feb 7, 2010
  8. ditchy

    ditchy Read Only Funster

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    hi cak tanks in kenilworth england they do them
     
  9. Mick H

    Mick H Read Only Funster

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    I've always used ordinary engine antifreeze in the waste tank.
    Buy the cheapest that you can find and only use it if the temperature dips well below freezing.
     
  10. oldun

    oldun Read Only Funster

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    I take it these are stuck on the outside?

    If so, unless these are very well insulated most of the heat will be lost outside the tank.
     
  11. derekfaeberwick

    derekfaeberwick Read Only Funster

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    Just leave the bloody things open. Problem gone.:Doh:
     
  12. Wildman

    Wildman Read Only Funster

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    It then becomes illegal to dump it anywhere!!!!!!!!!!!!!!!!!! antitfreeze ending up in your mains water supply is not good news.
     
  13. Larrynwin

    Larrynwin Funster

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    Yes they are stuck to the bottom but have a fairly thick bituminous felt type backing which looks to be a good insulator and of course the heat rises onto the tank bottom
     
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