Immersion heater

8 Nov 2007
Reaction score
United Kingdom
Last night I used the immersion heater for 20 min to get some quick hot water (Usually I use the hot water from the exchanger of the CH system). Now even after the immersion was turned off for so many hours (but the central heating and hot water are on), the top bit of the immersion (on top of the cylinder with a wire connecting the immersion to the electric switch, is it called “boss”?) is still quite hot. I wonder whether it is normal – The immersion has been switched off for more than 12 hours, why is it still hot?

Many thanks.
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the immersion boss will be hot its sitting in a cylinder full of 60 degrees water.

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