Component (a building block) — not the same thing as a radical or a sound component. · 4strokes
杰庶点烈热烹焉煮
Kangxi radical no.86 · 火 · 4strokes — The 214 Kangxi radicals
Filed under it in a dictionary. That is a lookup convention — it does not mean it is the only part the character is built from.
火灭灯灰灵灶灸灼