Please don't heat that bowl in the microwave.
Before I go to bed, I like to heat up milk and drink it.
Kombu seaweed releases its sweet flavor when it’s soaked in water and heated up.
Have you seen 温かい (warm) yet? Probably. If you have, you can guess that the verb version is to warm up or to warm.
The reading is the same like 温かい. As long as you know that word, you should be able to associate that reading with this word.