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Electric heaters contain a slave element - a metal rod that usually sits in the top and is designed to interact chemically with the various heavy metals etc that are in the water. Over time those rods are eaten away to the point where - if not replaced sooner -they cease to perform their design function and your heater becomes clogged up with all the things you don't want. This may well be your issue. Best check with the manufacturer and ask about replacements for the anode.
Peter
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