noun
EXAMPLES FROM CORPUS
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Immersion heater spanner Electric immersion heaters fit into a large screwed boss on the top or side of a hot water cylinder.
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Built-in airing cupboard incorporating lagged hot water tank and immersion heater .
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Separate airing cupboard with foam dipped hot water cylinder, immersion heater and timer for boiler.
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Simply switch to the Economy 7 tariff and update your immersion heater with an inexpensive Maxistore conversion package.
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You can hire the correct immersion heater spanner, but their cheapness probably makes buying one a better answer.