My baby is used to drinking warm breast milk. Is it okay to heat formula in a bottle warmer?

There is no need to heat formula in a bottle warmer. Formula are always made before a baby's feeding time. If baby prefers a warm temp fr milk, add more hot water to the bottle before adding room temp water to bring down the temp. There is no need to a bottle warmer for formula and formula have to be finished in an hour. Formula can not be made in advance.