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. This measure contains separate applications for bathrooms (1.0 gpm or less) and kitchens (1.5 gpm or less), and for the various types of homes and water heaters. “Any” home type and water heater applications are also included.
Unfortunately, metered research on this measure is scarce, inconsistent, and mostly outdated, as baseline and efficient case flow rates have both decreased over time.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 assessment contains a plausible model of water and energy use as a function of faucet rated flow rate based on findings from several of the metered studies and other assumptions. However, 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.