Anemometer Irish rebuilt as element in tank (9,6)

I believe the answer is:

immersion heater

I'm a little stuck... Click here to teach me more about this clue!

'element in tank' is the definition.
The definition suggests a singular noun which matches the answer.

'anemometer irish rebuilt' is the wordplay.
'rebuilt' indicates an anagram.
'anemometer'+'irish'='anemometerirish'
'anemometerirish' anagrammed gives 'IMMERSION HEATER'.

'as' is the link.

Can you help me to learn more?

(Another definition for immersion heater that I've seen is " Electrical device".)

I've seen this clue in The Daily Mail.

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