"MrCheerful" wrote in message
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"T i m" wrote in message
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Hi All,

I was round the Mother in law's yesterday and she mentioned that the
hot water has been very hot since my brother in law changed the
immersion heater or stat (we weren't sure which) a little while ago.

I hade a nose in there and it looked like (difficult to get at) the
temp settings went (clockwise) 60, 50, 70 and 80 deg C?

Was this right or was I seeing things?

The stat range settings you have quoted are standard for a domestic hot
water stat - if it is too hot set it to the lower end of the range.

As I couldn't see easily I turned it 'down' (fully anticlockwise) but
later thought I heard the immersion on quite hard (kettle heating up
type noises) even though the cyl was still pretty hot from before?

You will get a noise from an immersion heater tank as the element kicks
in - like a kettle, mostly you do not notice it as the tank is usually
insulated and hidden away in a cupboard or in a loft.

You say still pretty hot - even at the lower end (60deg C ) the bare tank
wall will be about 2 ouch (this is a calibrated (?) measurement which equals
the length of time you can touch something before you say ouch and take your
hand away ;-) ) - 60 degrees is hot - the heater will kick in a few degrees
below this to bring it back up to 60 deg at the stat, with immersion heaters
you do get localised hot spots close to the element where the temp is much
higher (even boiling point ) hence the kettle type noises you are hearing.

Is it possible the wrong heater or stat has been fitted and would that
give strange (overheat for setting) results?
Tim


it may be that the stat is not wired in, so the heat is on permanently,

If the heat was on permanently the tank would boil and the noise would
frighten the crap out of you, the header tank would be like a geyser,
bubbling and knocking all the time.