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Discuss Only a third tank of hot water in the Renewable Energy area at UKPlumbersForums.co.uk.

  1. John kronberg

    John kronberg New Member

    I have solar panels and in the summer we use the power generated to heat the immersion hot water tank, the only problem is the element goes into the tank via a top entry thus only the top of the tank water gets hot. I have put a longer element in (27 inch) which just about gives a shallow bath full of hot water.
    Someone has said that he as heard of some kind of tube that can be fitted around the element which will somehow circulate the water around the tank thus heating the whole tank.
    Alternately is there some way of fitting a circulating pump into the system to heat the whole tank.
    You advice will be greatly appreciated.
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Really you need a tank designed for that purpose

    I'm guessing your cylinder is open vented ?
     
  3. Best

    Best Trusted Plumber

    A cylinder with elements at the sides would mean you could heat most of cylinder using the lower element.
    If your cylinder is open vented, there is the alternative to simply having a Willis immersion heater fitted - (which is an external heater and adds heat immediately to top of cylinder and is therefore very rapid and will heat entire cylinder if needed)
     
    • Winner Winner x 1
  4. Dkdc71

    Dkdc71 Member

    Just asking why are you even using the immersion in summer there should be plenty of sufficient hot water without having to use your immersion .is your solar system working properly or has it been checked
     
  5. Best

    Best Trusted Plumber

    I initially read it same as you. Think the OP has electric panels.
     
    • Agree Agree x 3
  6. Dkdc71

    Dkdc71 Member

    Sorry just re read it again think your spot on Best thought he had a seriously f****d up solar system thanks
     
    • Funny Funny x 1
  7. bogrodder

    bogrodder GSR

    I use to do a fair bit of thermal solar a few years back and every now and again we’d install a retro fit immersion coil, to overcome your exact issue we’d fit a destratification pump.. yes I know there’s the running cost, but that wouldn’t apply to your free electricity! I’d circulate the hot from the top with a bronze pump to the cold feed at the bottom.

    Job done
     
  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    cant fit them on an open vented system
     
    • Like Like x 1
  9. bogrodder

    bogrodder GSR

    Why not Shaun corbs?
     
  10. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    would pump over
     
    • Agree Agree x 1
  11. bogrodder

    bogrodder GSR

    It doesn’t, trust me
     
  12. Dkdc71

    Dkdc71 Member

    Agree with Shaun corbs not calling you a liar but never seen it done like that only ever fitted them on a how water return sealed system . Would the pump not Rob from the domestic side when the household supply is called for by constantly recirculating from the expansion back to cold feed . Without going to all that trouble would have replaced the cylinder for one with dual immersions in the side .did you never get problems with water fluctuating or pressures after the pump been fitted bogrodder?
     
  13. bogrodder

    bogrodder GSR

    No, I never noticed a difference. But you’ve got to bear in mind you don’t need a fast flow, we cracked a bronze pump down via the gate valves . All it needs is a very slow flow rate and the delivery pipes were insulated well... oh and it was on a timer, so it wasn’t running 24 hours.

    Regards to pumping over, theoretically it would/ should pump over if the circulation loop were to broken.. ie blockage/ valve, but as the water can move, pumping over is impossible. Similar to most pumping over situations on a y plan when the neutral zone gets blocked from baked on sludge.
     
    • Like Like x 1
  14. Dkdc71

    Dkdc71 Member

    Thanks for the reply just to clarify are you talking about a sealed system have seen recirc pumps fitted as a secondary loop on sealed but not on a standard open system open system
     
  15. John kronberg

    John kronberg New Member

    Hi, my solar system only produces electricity, I do not have a solar system for the water stand alone, in the winter I use gas to heat the house and for hot water.
     
    • Like Like x 1
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