Science, Tech, Math › Science Does Hard Water Boil at a Higher Temperature? How Minerals Affect Water Boiling Point Share Flipboard Email Print Hard water boils at a slightly higher temperature than ordinary water. Dave Rudkin / Getty Images Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated July 08, 2019 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.