Faucet aerators reduce the flow of water from faucets. Installing an aerator on a higher flow faucet can result in water and energy (from hot water) savings if the user does not throttle the faucet higher or use the faucet for a longer duration.
Metered research on this measure is scarce, inconsistent, and mostly outdated, as baseline and efficient case flow rates have both decreased over time. As a result, savings, which are highly dependent on user behavior, are highly uncertain.
This measure is categorized as Planning because of significant uncertainties in the savings. A Research Strategy is also provided, which describes the pre/post, end-use metered research necessary to develop a Proven measure.