Heating units from the Titanic ? (6)

I believe the answer is:

therms

'heating units' is the definition.

'the titanic ?' is the wordplay.
'titanic ?' becomes 'rms' (Titanic is an example).
'the'+'rms'='THERMS'

'from' acts as a link.

(Other definitions for therms that I've seen before include "Units of heat used in measuring gas supply" , "Units of gas supplied" , "Old baths" .)

I've seen this clue in The Independent.

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