What conjugation is 熱せられる?


This is a sentence from ねじまき鳥と火曜日の女たち by 村上春樹.

> スチーム・アイロンの蒸気音とコットンが熱せられる独得の匂いを楽しみながら...

熱する is a "special suru verb". I am assuming 熱せられる is read as ねっせられる. What form
of conjugation is this? It looks like it could be passive or causative-
passive.




It's not causative-passive but just passive of 熱する as in "smell of cotton
(being) heated".




It's not causative-passive but just passive of 熱する as in "smell of cotton
(being) heated".

