Also try bes.ltd.uk, tlc-direct, and BDC whatever thheir site's called. For the extra few quid buy an extra corrosion resistant one and make sure it has the safety thermostat to the current regulations - lots of older ones are still on sale. They boil when they fail instead of cutting out.
They're usually just called immersion heaters, or immersion heater element, etc. Can;t find it in my screwfix cat, too much carp in there these days.
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