Discuss Immersion heaters 3 blown in two days! in the Plumbing Jobs | The Job-board area at PlumbersForums.net
The short life failures seems like an over voltage intermittent fault or a faulty batch.
Regards the previous problems you describe Galvanic action over a period could be a possibility but not the recent blow outs.
Yes, I think the crumbling copper is related to this, I would cross bond all pipe work to cylinder before fitting new elements, to rule out galvanic action.
Interesting one this, I will follow thread !
please keep us informed how you get on.
Do love an update...will no doubt help someone down the line when you finally resolve this....regards Turnpinunk:
Yes, realised what I put. DOL. but what I think I was getting at is the break down of the insulating powder failure.Chris, do you mean test at 500 as in insulation resistance, these are not made to work at that voltage, only that the insulation is still intact, and you wouldn't really test the equipment at 500v
My two bobs worth, in my experience the main cause of immersions blowing is localised overheating. In hard water areas this is normally due to the build-up of scale, not directly on the elements themselves, although this can happen, it tends to break off the surface and falls to builds up in piles under the elements obstructing the conversion currents which carry away the heat & stop it from overheating.
I use to see these pyramids of scale left in tack by the last engineer as I replaced the element shortly after the new one had been replaced. Use a scrapper to move it way or clear it out before installing new ones.
I though it was a good candidate for the cause of failure in this case until you said that the "top one" had gone as well, if the unit has a higher level "boost" immersion & this has failed as well then that blows my theory out of the water, excuses the pun!
Does the system have a secondary return installed with the mixed system pipework ??
Seems unlikely to be over voltage, when you think you test them at 500+, now measuring the resistance of the new ones may provide useful information.
Try that one again in the morning Chalked.!!I beg they never switch off on secondary !
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