Does Hard Water Boil at a Higher Temperature?

How Minerals Affect Water Boiling Point

Hard water boils at a slightly higher temperature than ordinary water.
Hard water boils at a slightly higher temperature than ordinary water. Dave Rudkin / Getty Images

Does hard water boil at a higher temperature than pure water or regular tap water? The answer is yes. The difference in temperature usually is a degree or two. Hard water contains dissolved minerals, which cause boiling point elevation. Adding salt to water produces a similar effect. The more dissolved minerals in the water, the greater the effect. However, it's not as significant as the effect of elevation on boiling point.