熱 means “heat, fever”

ねつ · netsu

Also: temperature, mania

Kun'yomi (Japanese reading)
あつい
On'yomi (Chinese reading)
ネツ

Taught in grade 4 · 15 strokes

The story

Fire (灬) burns beneath the earth. 熱い (atsui) is intense heat: the scorching surface, a burning fever, or passionate enthusiasm. Where 暑 is weather, 熱 is the heat itself.

Used in 熱帯 (nettai, tropics) and 情熱 (jounetsu, passion)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.