The amount of water used by your cooling misters will depend on a number of factors including the type of nozzle, number of nozzles, and frequency of use. Most residential systems include nozzles that consume between a 0.5 gal and 1.5 gal of water per hour. Nozzle flow rates may also vary depending on your home’s water pressure. In general, a lower nozzle flow rate and higher water pressure will create better evaporation rates and cooling. To get an idea of how much water your system will use in a day, just multiply the nozzle flow rate by the number of nozzles by the number of hours you operate the misters. For example, if you have 5 nozzles that each operates at 0.5 gal/hr for 4 hours each day, your water use would be 10 gal/day. See below:

Figure 1: Examples of different mister nozzles.

Left source: “Misting Systems” Southern Nevada Water Authority. Accessed May 23, 2003, by permission. Center source: “Misters – Stay Cool” Plumbing Supply. Accessed June 13, 2003, by permission. Right source: Aquacraft, Inc., by permission.