Note 1: Water pressure is a critical factor in a custom shower. GROHE recommends at least 50 psi for a system with 3 or more outlets.

Note 2: This is a biggey! While it is against national code, on occasion, homeowners have reportedly removed the restrictors from their shower heads. (This is a practice which we discourage. It upsets the balance of the system.) If restrictors are removed, GROHE
shower heads, hand showers, or body sprays will flow (on average) 4.5 gpm unrestricted. If a homeowner has removed the restrictor from a GROHE 28 206 Deluxe Champagne Spray shower head, the flow will be up to 14 gpm.

Note 3: If the number of shower outlets desired is more than one valve can accommodate, it will be necessary to use two (or more) thermostat valves. With two valves, if two people are using the shower at the same time, each person can select the temperature he or she prefers. When more than one 3/4” valve is necessary GROHE recommends that water supplies be 1” or larger.

Note 4: Whenever designing a custom shower where a well is involved, make sure you know both the flow and pressure capacity of the well/pump system. A pump supplying 10 gpm at 30 psi might be fine for a simple tub/shower, but it’s never going to do the job for a 5-head custom shower with a 3/4” thermostat valve. Either you will have to settle for a standard shower, or upgrade the well pump.