How low can you go with showerheads? Well, Bricor has some showerheads that use as little as a 1/2 a gallon of water per minute. These showerheads make use of “vacuum flow restriction†technology created by Bricor. The showerheads seen here are the “B100 SUPERMAX†series, and they are rated at 1.125 gallons per minute @ 50 psi. Bricor also has a “B100 ULTRA MAX†showerhead that is rated at 0.5025 gpm. You’ll have to pay for such a low flow — the showerheads cost about $60-$80 each. But don’t forget you’ll be saving water and the cost of heating the hot water for your showers.