basics of diagnosing luke warm hot water please

Discussion in 'Plumbing and Central Heating' started by tommydickfinger, 2 Feb 2009.

  1. tommydickfinger

    tommydickfinger

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    hi folks, im not a plumber so please be obvious in any advice given,

    Symptoms, hot water used to scold you when on hot maximum,now the water flow rate has to be turned down to a minimum just to be luke warm.

    Known facts/faults.

    heatline combi 6 years old. pressure vessel not pressurised to manfactures recommended. have the instruction booklet so can do any tests that require manufacturers tolerences.

    kind regards

    tommy
     
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  3. sooey

    sooey

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    In cold weather the combi can't raise the water to the same temp as it can in summer, simply because the incoming water is ten or more degrees colder. The smaller the combi you have, the more obvious the difference.
     
  4. gavinda

    gavinda

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    check your flow rate versus temperature rise. that will tell you if the boilers in tolerance. you just need a flow cup and a thermometer.
     
  5. tommydickfinger

    tommydickfinger

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    thanx sooey and gavinder- but theres def a fault- the waters barely tepid whilst in the shower- and of course its been in longer than just 1 year so know the performance is not constrained to it being winter- again please be specific in any tests you suggest- kind regards

    tommy
     
  6. sooey

    sooey

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    The first test to do then is to let the heating circuit go cold, then run a hot water tap with the heating off. See if the flow pipe to the heating circuit under the boiler gets warm.
     
  7. tommydickfinger

    tommydickfinger

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    will do sooey- is this to diagnose hydroblock? (think its called that?) the bit that directs the hot water to my taps( in around about way) bit with the flangey-m-bob :)

    kind regards

    tommy
     
  8. gavinda

    gavinda

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    excactly :LOL:

    this'll let you know if your diverter is letting by to the heating circuit.
     
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