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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.
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grammar verbs conjugations passive-voice
What conjugation is 熱せられる?
It's not causative-passive but just passive of 熱する as in "smell of cotton
(being) heated".
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As user4092 noted, this is the passive of 熱する. Several of the conjugated
forms:

  * 熱する -- plain
  * 熱します -- polite
  * 熱させる -- causative
  * 熱される -- passive
  * 熱せられる -- classical passive (see Update below)
  * 熱させられる -- causative passive
  * 熱せる -- potential
  * 熱さない -- negative

Those last two are (part of) what makes this a "special" する verb: the する in
plain form becomes せる in the potential instead of できる, and さない in the negative
instead of しない. See also 愛【あい】する, which follows the same pattern: this
conjugates like a regular 五段【ごだん】 or "type 1" verb ending in す, and it doesn't
follow the pattern for independent verb する. Compare 返【かえ】す, 漏【も】らす, and other
"type 1" verbs ending in す.

Notably, the negative is currently in flux for these "special" する verbs, where
popular usage seems to accept both ～さない and ～しない endings to varying degrees.
For strict grammarians, ～さない appears to be regarded as "more correct".

### Update

For the passive itself, there are two forms that appear in texts: 熱される, the
more or less regular form, and 熱せられる, the more "traditional" or old-fashioned
form. Although many other "special" する verbs have shifted more fully to using
～される as the passive, at least
[<https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1243719877> one
online thread] explicitly mentions that there appears to be some resistance to
this shift for this term 熱する.

The key is the derivation: this was originally a single kanji + す, the
precursor to modern する. The conjugation stems for classical す:

  * す -- terminal, plain form
  * し -- gerundive or connecting form
  * せ -- irrealis or incomplete, used for negative, passive, causative, etc.
  * する -- adnominal, used when modifying a noun. This evolved into the modern verb plain form.
  * すれ -- realis, used for subjunctive statements and suppositions
  * せよ -- imperative

For this classical す as attached to a single kanji, the passive was せられる (or
older せらる). This is a bit of a mouthful, and over time, it shortened to される
(older さる).

(A similar kind of shortening led to modern いらっしゃる, from older いらせらる.)
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