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Pressurised system dumping hot water?

Discussion in 'Plumbing and Central Heating' started by Loofah, 29 Dec 2020.

  1. Loofah

    Loofah

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    I have a pressurised system, tank in utility room and boiler in loft, and generally everything works fine.
    Every now and then, about once a week maybe, all the hot water disappears. I can be using it and then 15 mins later there's no trace of even warm water being available. Today for example, everyone had their shower (only 2 adults) and ran a bit for some washing up then by 1130 absolutely zero hot water. Do these systems ever dump their contents? On other days there's no issue at all and we certainly haven't emptied the tank which is a Stelflow twin std, 250l. boiler is a worcester bosch
    I'm at a loss, knowing next to nothing of the system
     
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  3. JohnD

    JohnD

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    what hours are on the timer?
     
  4. ETAF

    ETAF

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    Is this always the same day of week, maybe look at the timer as suggested
    is it a week timer or 24hours
    we have a timer for the week, so we can set different On/Off times for each day of the week for Hotwater & CH
    However, what times do you have shower etc - we can run off our little hotwater tank on a couple of showers , washing up etc.
     
  5. endecotp

    endecotp

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    No.

    2 people x 10 minutes each x 12.5 litres per minute = 250 litres.

    Try measuring how much water your shower uses, with a measuring jug and a timer.
     
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  7. fixitflav

    fixitflav

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    I would try running the hot water 24/7. If the cylinder is well insulated I doubt if you'd notice any increased gas usage.
     
  8. Loofah

    Loofah

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    Thanks. I'll double check the timer but think it's set the same across the week and I haven't noticed if this is on one specific day so I'll check that. I'm just finding it weird that with the broadly same routine (and much shorter showers than 10 mins!) that occasionally the hot water disappears. It's not even mid-use, like running a tap and it runs out, it's being used then next time the hot water is freezing and just not available.

    I assumed the storage tank has it's own insulation but it doesn't have any extra lagging.
     
  9. fixitflav

    fixitflav

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    I can't think of an explanation, but just one thing - has it always behaved like this or is a new problem?

    Unless it's very old, it will be pre-insulated with some sort of foam. That's a big cylinder, more typically about 1/2 that volume. According to the website, it can also use solar heating (in addition to gas boiler). It probably doesn't explain your problem, but do you have that?
     
  10. Loofah

    Loofah

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    No, just supplied via the boiler. If the system doesn't dump it then it must just be a mucked up timer as there's no way we use that much water. I have yet to check! It's the suddeness of no supply that I'm baffled by
     
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