Example: Shower head delivers 2.5gpm at 80psi* 5 heads x 2.5gpm = 12.5gpm Valve is rated at 16gpm No problem! * 50psi is recommended for showers with 3 or more heads
What happens when the home owner removes the restrictors? Unrestricted, the flow rate of a typical shower head will be approx. 4.5gpm. 4.5 x 5 = 22.5 Now the 16gpm valve can’t deliver
Note: Do not tee off of a single ½” or ¾” supply to service two or more thermostatic valves. Solution: If you need more than one valve use a 1” supply or plumb each valve with a separate supply directly from the main or manifold
The Drain In the prior example 5 heads could deliver 62.5 gallons of water in 5 minutes. Where will it go? Two 2” drains or one 3” drain is recommended for the multi head shower Note: Pay particular attention to this on accessible showers
Hot Water The bigger the shower, and more heads means more HOT WATER! A 50 gallon hot water heater will supply a 4 head custom shower for approx. 8 minutes. 100 gal should be a minimum
A ) User height is a critical factor in setting the height of shower outlets. Note: Children or anyone confined to a wheelchair can be accommodated by a hand held shower head. B)The shower head should be set at a level above the head of the tallest user but within the reach of the shorter user. (excluding children)
C)The top level body-spray is normally set at shoulder height. It should not spray into the face of the user. D)The mid-level body spray is normally set at waist or hip level. E) The lowest level body spray is normally set at thigh level or knee height.
Note: Body sprays should be place on a different plane than the shower head. The idea is to have the entire body covered by water. F)The thermostatic temperature control valve should be set at approx. waist height and should be easily accessible.
Positioning Shower Components G) Volume controls (on/off valves) should be easily accessible to anyone using the shower, usually about waist high and slightly above the thermostat valve.