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As you know, water is supposed to be tasteless but certain amount of carbon dioxide, oxygen, impurities in our glasses and food particles get mixed with water which gives a taste to water.
Actually, the coldness of water suppresses some of these bad factors that make a change in taste of pure water. Any impurities that make the water taste slightly different get removed when the water is warm.
However, some people love to drink cold water whereas some love to drink warm water because the fact that water is an acquired taste - a preference that a person develops over many years i.e. a person living in the poles will not like the water to be cold as someone living in desert may love it.
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