Cold rental in resort -- hotel dining room warmer (7,7)

I believe the answer is:

central heating

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

'room warmer' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'cold rental in resort hotel dining' is the wordplay.
'cold' becomes 'C' (eg on taps).
'in resort' indicates anagramming the letters (letters get re-sorted).
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'dining' becomes 'eating' (I've seen this in another clue).
'rental' is an anagram of 'entral'.
'c'+'entral'+'h'+'eating'='CENTRAL HEATING'

Can you help me to learn more?

(Other definitions for central heating that I've seen before include "source of warmth" , "Domestic system" .)

I've seen this clue in The Telegraph.

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