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Hot water secondary return/loop

Discussion in 'Plumbing and Central Heating' started by electronicsuk, 6 Sep 2009.

  1. electronicsuk

    electronicsuk

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    In the coming month I'll be fitting a new vented cylinder in my parent's house, as their boiler has given out, and they have decided to upgrade the entire system along with sorting out the controls so that they actually work.

    There's a wet room with a 15-20m run from the cylinder, so it takes some time to get hot water through to the taps, especially in the winter when the pipework is particularly cold.

    It seems to me that now would be the ideal time to install a secondary return to sort this problem out, although there's not a great deal of information for the DIYer on the 'net with regard to this type of installation.

    My understanding is that I will need to come off the far end of the HW flow pipework at the wet room with another return pipe, for which I hope 15mm will suffice, as the return is purely for circulation and not intended to supply HW. This will then go back to the airing cupboard, where a bronze pump will be fitted, then onto a double check valve, and back into the tank via an Essex flange.

    Hope you wont mind if I ask a few questions that I haven't been able to answer myself by searching the internet and the forums:

    1. In a couple of other topics I've heard mention of balancing valves. Unless I've got myself in a muddle, can someone please explain the purpose of these, so that I can understand whether or not it's something I'll need to consider. I had assumed that I could simply tee off the flow leg to my draw off points, and then loop back the return at the final draw off point.

    2. Where on the tank should I be fitting the Essex flange? I've read 3/4 of the way up from the base of the tank, but don't know how correct this is.

    3. I've read that the Grundfos Comfort pump is available with integrated non-return valve, and the option of an integrated timer also seems useful. Has anyone any experience with these? Are they expensive? Reliable?

    4. Anything else I should be aware of?
     
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  3. Biggles..

    Biggles..

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    grundfos up10-16 is an awsome return pump.
     
  4. electronicsuk

    electronicsuk

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    That's from the comfort range, isn't it? Trouble is, they seem a bit pricey and not all that easy to come by. I think it will come down to whether or not the comfort with integrated stat + timer works out cheaper than a pump with separate pipe stat + timer.
     
  5. Biggles..

    Biggles..

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    about £160ish from any merchants.saves any messing.
     
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  6. electronicsuk

    electronicsuk

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    Thanks for the quick response. If that includes the timer, stat and non-return valves then it seems a pretty reasonable price.

    Can anyone advise if the rest of the proposed installation sounds reasonable?
     
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  8. electronicsuk

    electronicsuk

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    Sorry to bump this guys, but I find it hard to believe that nobody on this forum knows enough to provide a little advice on secondary returns. Either that, or nobody wants to... :confused:
     
  9. clf-gas

    clf-gas

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    What you propose is fine.

    If i was fitting a new cylinder I would fit one with a secondary boss in it, I wouldn't go to the bother of an Essex.

    Still if this is what you want to do, then all is good.
     
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  10. doitall

    doitall

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    Got it in one :rolleyes:
     
  11. electronicsuk

    electronicsuk

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    Thanks for the response. Don't worry, I clicked the button! :)

    If this is still an ongoing thing about hot water head, forget it and live another day - I have better things to do than hold grudges. That still doesn't mean that I accept your argument, though. ;)
     
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