Typically, the maximum flow rate is permanently marked on the aerator of the faucet, or on the threaded ball joint connector to the shower arm. Certain concealed aerators do not have space to allow for marking.
For Lavatory Faucets:
- Lavatory faucets produced before 2009 were equipped with bubble aerator flow controllers to limit flow to the federally mandated maximum flow rate of 2.2gpm @ 60 psi.
- Lavatory faucets from 2009 or later are equipped with a laminar flow device with a maximum flow of 1.5gpm @ 60 psi.
- To comply with California Energy Commission regulation, from July 2016 or later, residential used lavatory faucets come with a maximum flow of 1.2 gpm @ 60 psi. And, public lavatory faucets are with a maximum flow rate of 0.5 gpm @ 60 psi.
For Kitchen Faucets:
- Older kitchen faucets are equipped with flow controllers to limit maximum flow to 2.2gpm @ 60 psi.
- To comply with California Energy Commission regulation, from January 2016 or later, kitchen faucets and aerators come with a maximum flow of 1.8 gpm @ 60 psi. And, pot fillers are with a maximum flow of 2.5 gpm @ 60 psi.
For Showerheads:
- Older showerheads may flow at different flow rates up to a maximum flow rate of 2.5 gpm @ 80 psi and are marked accordingly.
- To comply with California Energy Commission regulation, from July 2016 or later, showerheads are with a maximum flow of 2.0gpm, 1.75gpm, or 1.5gpm @80psi, and are marked accordingly.
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