Fire was a very important element in Zoroastrian worship because it was seen as a symbol of truth, purity, and righteousness, embodying the principles of Ahura Mazda, the supreme deity in Zoroastrianism. Fire represents light, wisdom, and the presence of divine spirit, and is integral to various rituals and ceremonies. Zoroastrians often maintain a sacred flame in their temples, which serves as a focal point for worship and as a reminder of the eternal nature of truth (or Good).
While warmth and survival are relevant to the environment, the primary significance of fire in Zoroastrianism is its spiritual and symbolic role rather than merely its practical benefits.