warm
煖 centers on gentle warmth, especially from fire or heat. Its meaning is essentially the same as the more common 暖, but 煖 is a rarer variant.
煖 combines 火 (fire) with 爰, which likely contributes the sound and the idea of gentle warmth. It is a variant form of 暖, where 日 (sun) replaces 火.
The left side is fire 火, and the right side 爰 looks like a hand reaching down to pull something closer. Picture pulling your hands near a fire to feel its gentle warmth.
For ダン, imagine a warm down blanket by the fire: down -> ダン, and the fire keeps you cozy.
words provide more warmth than cloth