How Much Water Do Patio Misters Use?


Misting systems although still not popular, have been in use for the last 50 years. They provide a fine spray of water through their interconnected nozzles. For them to do that, the system requires pressure not less than 500 psi. If you operate your misting system with pressure below that, it will produce large droplets which can cause inefficient cooling.

There are four patio misting system applications which are outdoor cooling, dust control, odor control, and special effects. Each application has its own set of design requirements to operate. Patio system provides the best cooling option in times of hot weather and drought. So how much water do patio misters use? Find out from this guide.


The amount used by a misting system depends on several factors. But in general, it is said the nozzles release between 600ml and 800ml approximately per minute. For you to estimate how much water your system uses, there are some things you should know.

1. The Pressure of Water in the System

The quality of the mist is determined by how big or small the aqua droplets that make it up are. The evaporation of each one immediately cools the air surrounding it. Larger droplets will take more evaporation time than small ones. Should the big droplets land on you before they evaporate, they make you wet. But if you are in dry air, the feeling can be incredible. However, it can be really uncomfortable if you don’t want to be wetted or if you are in a humid area.

Smaller droplets quickly evaporate. The process is sometimes referred as “flash evaporation.” And it gives an instant and significant cooling. These kinds of droplets drift to other areas faster than big droplets.

Big droplets are yielded by a low-pressure misting system which also produces fewer aqua droplets. But fewer larger droplets cools the air unevenly. While a high-pressure system produces small aqua droplets and more droplets, that evenly and instantly cools the air.

If the diameter of mist drops by half, it increases the number of droplets produced in a given volume by eight times. How big or small aqua droplets are is given in microns (1 micron is equivalent to 001mm). Here is a table of the most common nozzle types using 1000psi/70 bars that will help you estimate your aqua pressure.

.016″ / .4 mm – 3.8 microns – 47.9 microns

.012″ / .3 mm – 1.6 microns – 39.1 microns

.008″ / .2 mm -.4 microns – 37.9 microns

.006″ / .15 mm – 1.2 microns – 36.4 microns

2. The Type of Misting Nozzle

The capacity of your misting nozzle opening is balanced by the water pressure in your system and the flow rate, which helps in creating an air-cool mist. Your nozzles will diffuse more droplets during high pressure and less droplets in low pressure. The flow rate through the nozzles increases with an increase in aqua pressure at the nozzle. If your pressure is high, you’ll need nozzles with minor openings. And the vice versa is true. Select the right nozzle depending on your aqua pressure for the pump to work effectively.

Water Cooling

.012″ / .3 mm- used by most systems, it is best for medium pressure system since it yields less moisture and complete evaporation. It can be used for both closed and open areas.

.008″ / .2 mm – it is best for systems that use less volume of aqua with small droplets. It yields minimal moisture as well as complete evaporation. It is excellent for high-pressure systems.

.006″ / .15 mm – best for systems that use low aqua volume and small droplets, minimal moisture and complete evaporation. It won’t work for pressure below 250psi.

Other factors also affect the amount that your system yields, they include the flow rate and the frequency of use. Of course, if the flow rate is high, more water will be used as opposed to when the flow rate is low. And also, if you often use your system, you will use more amounts than a person who rarely uses their system.