Making sense of this conjugation of する

I was reading an example sentence that went,
水は熱せられると蒸気になる。Meaning, water will turn to steam when heated.

I’m not sure about せられる but I think it’s supposed to be the passive + causative forms of する. But then shouldn’t it be させられる? Is せられる an abbreviation for that, or is it something else entirely?

It’s just the passive of 熱する

This isn’t a normal する word. This and other ones where the second sound of the kanji gets turned into a little つ are not the same as just tacking する on 熱 (that’s a simplification, there’s more than just that)

It’s ねっする and basically has its own rules.熱する

Here’s a list of “special class” する verbs.


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