Gentle Warmth:
* As warm as a summer breeze.
* Like a soft blanket on a chilly day.
* As comforting as a hug from a loved one.
* Like the glow of a fireplace on a snowy night.
Intense Warmth:
* Like the heat of a thousand suns.
* As scorching as a desert midday.
* Like the burning embers of a campfire.
* As intense as the love in a passionate embrace.
Emotional Warmth:
* Like the feeling of belonging.
* As comforting as a familiar melody.
* As soothing as a whispered secret.
* Like the joy of a child's laughter.
The best simile for you will depend on the specific context you're using it in. Consider what kind of warmth you want to convey and choose a simile that fits your needs.