Not that I have bottle fed but especially a young baby I would heat it up as breastmilk is heated to about 37 degrees which is mums body temperature. Otherwise baby is taking energy to warm itself back up instead of digesting and putting that energy to good use. When the baby is older though room temperature would be ok.
DS#1 we warmed the water at first in a cup of boiling water but then in micro added formula and off we went PIA!! it was
DS#2 room temp boiled water from word go no tummy problems happy as a lark, he is on cows milk now and only the last few nights with it being cold have we wamred the milk slightly
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