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New Hot Water Cylinder but no hot water.

Discussion in 'Plumbing and Central Heating' started by DariusB, 5 May 2021.

  1. fixitflav

    fixitflav

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    A bit old hat for a new build in 1978.
    Even in the summer when you didn't want it!
     
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  3. DariusB

    DariusB

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    What kind off ballpark figure are you looking at for that kind of job?
     
  4. RayCaister

    RayCaister

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    But but but We did want it. The radiator in the bathroom acted as a heated towel rail and in the small bedroom the wife always had washing be aired on a clothes horse. The large radiators in the main bedrooms were turned off during the hotter months.
     
  5. fixitflav

    fixitflav

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    For gravity circulation the boiler pipework must be 28mm or even 35mm, and the old HW cylinder connections the same. That should have given the plumber a clue.
     
  6. JohnD

    JohnD

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    as a DIY, it was about a day.

    I got a used pump of fleabay

    and a cylinder stat
     
  7. fixitflav

    fixitflav

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    OK, I just meant that if the weather's very hot so it's hard to get any sleep, the last thing you need is more heat upstairs.
     
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  9. muggles

    muggles

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    Around £500+vat
     
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  10. oilhead

    oilhead

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    With a warm air system there was not a lot of options. Its a long time since I was involved with warm air, but IIRC there is a separate burner for the hot water, so a pumped circuit on a separate timer should be available.
    It's not that special cylinders are available for pumped systems, more that you can still get special cylinders for gravity systems. A fully pumped multi core coil will give greater recovery time.
     
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  11. fixitflav

    fixitflav

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    OK
    Did you mean better ie shorter recovery time?
     
  12. Nige F

    Nige F

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    I remember seeing a warm air system with 22mm primary circuit pipes to the cylinder - somehow working on gravity/thermosyphon . :eek: Anyway can you measure those pipes coming out of the boiler - I can't decide if they are 28mm but I think 22.;)
     
  13. ianmcd

    ianmcd

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    OH dear, some of the pipes might be hidden, but looks like you have a Janus Circulator, it was origionally installed as a direct system and your installer has fitted it to an indirect cylinder, can you post a pic of the label on the cylinder, the following link shows the diffent way of installing the same unit, but you dont have an F&E connection on the coil , which you will need if it is an indirect cylinder, not needed if a direct cylinder

    https://www.gotogasdocs.co.uk/f/m/J...Heating/Installation Instructions/JANUS 3.pdf
     
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  14. Nige F

    Nige F

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    Thanks for the info Ianmcd - as I thought 3/4 BSP connections . OP needs to search for a F+E cistern . Janus - a pain in the .....
     
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