I had the temperature set so that it was exactly right for shower purposes.
I took a shower the other day, and the water seemed a little hotter than it should have been - only by a few degrees. I could have been mistaken...
Today, the heater is not heating the water at all. Actually, the water comes out tepid, but that may be residual heat from when it was working, a couple of days ago.
As the cirquit breaker in the consumer unit has not flipped, so I am assuming the fault is either the immersion heater element or the thermostat. Both were brand new in August 2010 (i.e., 17 months ago, purchased from B.E.S.). Is it usual for one of these items to fail so quickly? I only use the immersion heater about 1 hour every coupe of weeks, as I often take my shower elsewhere.
How do I determine which item has failed? I have a multi-meter available.