Glossary
Hot Water vs. Cold Water
Definition
Hot-water versus cold-water describes the two pressure-washer types: a cold unit moves water at pressure, while a hot unit adds a heating coil that makes it far more effective on grease and oil.
Heat breaks the bond between oil and a surface, so a hot-water machine cuts through driveway oil, kitchen grease, and gum in a way cold water cannot match at the same pressure. That is why most commercial flatwork and drive-thru work is done hot.
Hot units cost more, weigh more, and need fuel and maintenance, so many residential operators run cold and rely on chemistry instead. If you chase fleet washing, restaurants, or oily concrete, hot water is usually worth the investment.