Quote:
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Originally Posted by
1tim23 wrote:
When I fit a new (backup) immersion heater I'm a little nervous of
using too much or too litte force (I suspect the old cylinder is now
leaking due to the stresses caused by fitting the old i/h).
Why, is it leaking at the immersion heater boss?
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It suddenly started leaking near the IH boss for no apparent reason, after not being touched for 9 years. A plumber took a look at it, swapped the IH for a new one, found the leak was still there, then pronounced that a new cylinder was required. The same thing happened last time the cylinder had to be replaced, 9 years ago (but a different plumber !). The story that plumber spun me was that if the cylinder gets dented or stretched by over-tightening the IH, it forms a thin point in the copper wall that is vulnerable to pin-hole corrosion. The latest cylinder did indeed have a dent near the boss, as if the IH spanner had pressed against it during tightening.
Don't know if any of this makes sense, but I want to avoid the same fate for cylinder number 3.
Thanks for all the other advice.