warm
煊 centers on warmth, specifically a gentle or spreading warmth, often associated with fire or sunlight.
煊 combines 火 (fire) with 宣, which likely contributes the sound and may carry a sense of spreading or declaring, suggesting warmth that radiates or spreads.
Fire 火 beside 宣: imagine a fire spreading its warmth like a declaration, gently heating everything around it.
For ケン, picture a warm can of soup by the fire: can -> ケン, and the fire keeps it warm.