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Recent content by JST

  1. J

    Heatslave 12/18 Poor DHW Performance

    John, when all thermal energy has been bled from the store, then yes, that is the case. I guess it’s ambient temperature and warmth within the boiler casing, rather than the water being heated to 15 degrees ish. When the store temperature is down the boiler runs continuously and does heat the...
  2. J

    Heatslave 12/18 Poor DHW Performance

    John, thanks for the numbers, gives me more of an idea of how it should behave when working correctly. Exedon, yes, flow switch was replaced a couple of years ago when the boiler was producing no DHW. Also, DHW flow rate displayed on boiler LCD does appear to be accurate, based on measurements...
  3. J

    Heatslave 12/18 Poor DHW Performance

    Hi all, We have an external Worcester Bosch heatslave 12/18 oil combi which is causing much frustration on the DHW side only, CH is completely reliable. DHW always starts off hot and is ok for a quick shower but will not fill our very small bath - turns cold after around 50 litres (cold...
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