This item will be in the center of the fiery pool after you defeat Ragnaros in normal mode with somebody who has the quest. Make sure you get heals when you swim for it.
The other way: if you defeat Ragnaros heroic it will just be in loot chest with other items.
Note: Heart of Flame will only appear if the player on the quest has obtained all 250 x Smouldering Essence.
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