Surely the thermostat is measuring the water temp not the tank temp is it
not?. Why did they not fit a new one? They are cheap items after all,
compared to a new tank.
Brian

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The Sofa of Brian Gaff...

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"Chris B" wrote in message
...
Next door neighbour has just had their HW tank replaced under maintenance
contract by BG. The old tank was copper but I think the new one is SS -
it is certainly very flat topped (still open vented).

They transferred the immersion heater (the immersion heater is not used
and is a back up for boiler failure only) and thermostat from old tank to
new but now they seem unable to get satisfactory HW temperature.

One minute it is scalding hot, reduce the thermostat setting by 1Deg and
the water ends up dropping to luke warm before the boiler wakes up to warm
it up.

When moving the thermostat manually there is about a 5C "backlash" between
switch on/off operations.

Any suggestions as to whether this is

1) a thermostat that didn't like being moved and has failed due to the
disturbance

2) Lack of thermal connection between the new tank and the thermostat
(should there be any form of heat transfer compound between them) - I
think this would be my first point of call if it was my tank)

3) Incorrect positioning of the thermostat

4) any other ideas.

He has the maintenance contact with BG so they will be called in to fix it
but he would like some confidence that the problem can be fixed.


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Chris B (News)