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Discuss Indirect cylinder heating problems in the Central Heating Forum area at

  1. Hugh Hair

    Hugh Hair New Member

    Boiler has 28mm pipes to indirect cylinder gravity feed. Pipe exit from boiler is hot (boiler stat no5). Hot water cylinder not hot enough, boiler running 24 hours continuously. Problem only started, previously piping hot. Can only think there is a blockage or restriction in pipe work, but seems unusual in large bore copper. Any ideas?
  2. Darren Jackson

    Darren Jackson Plumber GSR

    Thermostat on boiler been turned down or faulty?

    Thermostat on cylinder Faulty?

    Blocked feed pipe from header tank?
  3. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Have you drained the system down ?

    Header tank 1/3 full of water ?
  4. Best

    Best Trusted Plumber Top Contributor!!

    Things that need checked are, -
    Is there a few inches water in expansion and feed tank?
    Is there water at top connection to coil?
    Is there a blockage in the feed pipe?
  5. jtsplumbing

    jtsplumbing Plumber GSR

    As B4 small tank in loft is empty and water level in pipes is to low to let it gravitate
  6. Hugh Hair

    Hugh Hair New Member

  7. Hugh Hair

    Hugh Hair New Member

    Many thanks guys, header tank empty. Filled up ok but will probably fit new ballcock. Problem solved, thanks a million
    • Like Like x 2
  8. Best

    Best Trusted Plumber Top Contributor!!

    The older ballvalves that have brass pistons inside them will tend to seize up easily on heating tanks, as the valve rarely needs to replenish water
    • Like Like x 1
    • Agree Agree x 1
  9. quality

    quality Plumber GSR

    I agree entirely, whats better to fit is a modern foreign valve that will fail and never shut off after a couple of years, that way it will need replacing again lol
    • Funny Funny x 2
  10. spanner

    spanner Plumber GSR

    Check emitters are all okay might need a tweek of a bleed after topping up the f&e.
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