What pressure is required for a flushometer?

25 – 40 psi
While true gravity tank toilets will operate at water pressures of only 10 – 15 psi, pressure- assist tank and flushometer toilets usually require 25 – 40 psi and, sometimes, even more. This is the pressure at the toilet, not the pressure coming into the building.

Table of Contents

What is the minimum pipe diameter for a flushometer water closet?

3/8
604.5 Size of Fixture Supply

FIXTURE	MINIMUM PIPE SIZE (inch)
Wall hydrant	1/2
Water closet, flush tank	3/8
Water closet, flushometer tank	3/8
Water closet, flushometer valve	1

How many fixture units is a flushometer?

Water supply fixture units (WSFU) for typical non-potable applications. 1

Appliances, appurtenances, or fixtures	Minimum fixture branch pipe size (inches)	Water supply fixture units (WSFU)
Private
Urinal, 1.0 gpf2 flushometer valve	3/4	3.0
Urinal, > 1.0 gpf flushometer valve	3/4	3.0
Urinal, flush tank	1/2	4.0

How much water pressure does a commercial toilet need?

Water supply specifications for a typical manual commercial toilet flush valve such as the Kohler K-13517 call for a static pressure of 35 pounds per square inch and a flow of 25 gallons per minute.

How is WSFU calculated?

The total wsfu required is calculated like this:

WCs: 4 X 10 wsfu = 40 wsfu.
2 Lavs: 2 X 1.5 wsfu = 3 wsfu.
Total wsfu: 40 + 3 = 43.
𝐷𝑒𝑚𝑎𝑛𝑑=48−(48−46)∗(45−43)(45−40) 𝐷𝑒𝑚𝑎𝑛𝑑=47.2 gpm.

How do you calculate fixture units?

First, insert the number of each type of fixture on your premises under the column headed “Quantity”. Second, multiply the quantity by the number of fixture units given under either column “Private Use” or “Public Use”, whichever is applicable. Third, post the result in the “Total column”.

How much does it cost to install a flushometer?

Costs can range from $350 up to $550, depending on how extensive the remodeling requirements might be. When these flushometer fixtures were developed back in the 1930s, water was cheap and plentiful.

How many fixtures can a 1 inch water line supply?

For our example, our 1-inch pipe can have up to 30 fixture units, our 3/4-inch can have up to 14, and our 1/2-inch can have up to 4.

What is a flushometer tank toilet?

A flushometer is a device used for flushing toilets which is designed to utilize less water than a conventional flushing system. Flushometers are often installed in public toilets to cut down on water usage, and they can also be used at home, if people are thus inclined.

How do you convert GPM to WSFU?

1 WSFU = 1 GPM = 3.79 liter/min.
1 in = 25.4 mm.

How many fixture units is a commercial toilet?

P3004. 1 DWV System Load

TYPE OF FIXTURE OR GROUP OF FIXTURES	DRAINAGE FIXTURE UNIT VALUE (d.f.u.)a
Laundry tub	2
Shower stall	2
Water closet (1.6 gallons per flush)	3
Water closet (greater than 1.6 gallons per flush)	4

How many fixtures can a 1/2 pipe supply?

What are the specifications of a flush valve and flushometer?

Specifications of flush valves and flushometers include: The flush rate, ranging from 0.125 gallons per flush for urinals to 1.6 gallons per flush for toilets. User specifications such as Americans with Disabilities Act compliance.

What is the best flushometer for high-use applications?

While flushometers are inherently designed to work well in high-use conditions, some applications endure harsher conditions than others. Specialized flushometers such as naval and prison models are appropriate for such applications.

What size flushometer do I need for my toilet?

The toilet design itself has to accommodate a lower volume flush. An older tank toilet might require up to 5 gallons to flush, making a 1.6 gpf flushometer incompatible.

Can you use a flushometer for liquid waste?

Disposal of liquid waste requires less water than solid waste, so you can opt for a lower-volume flush as needed. This can help with water savings when used appropriately. The drawback to installing a flushometer is that it’s not compatible with all plumbing systems. The toilet design itself has to accommodate a lower volume flush.