Water Supply

IPC WSFU Table (Table E102.3)

Complete IPC Water Supply Fixture Unit values from Table E102.3(2) for all standard fixture types.

Introduction

The IPC Table E102.3(2) defines Water Supply Fixture Units (WSFU) for every fixture type, separated by cold and hot water, occupancy (private vs public), and supply control type (flush tank vs flushometer). These values are the foundation of IPC pipe sizing.

IPC Table E102.3(2) - Selected WSFU Values

Fixture	Occupancy	Supply Control	Cold WSFU	Hot WSFU
Water closet	Private	Flush tank	2.5	0
Water closet	Private	Flushometer valve	2.5	0
Water closet	Public	Flush tank	2.5	0
Water closet	Public	Flushometer valve	5	0
Urinal	Public	Flushometer valve	5	0
Lavatory	Private	Faucet	0.5	0.5
Lavatory	Public	Faucet	1	1
Bathtub	Private	Faucet	4	4
Bathtub	Public	Faucet	4	4
Shower	Private	Faucet	2	2
Shower	Public	Faucet	2	2
Kitchen sink	Private	Faucet	2	2
Kitchen sink	Public	Faucet	2	2
Service sink	Public	Faucet	3	3
Hose bibb	Private	Faucet	2.5	0
Drinking fountain	Public	Faucet	0.5	0

Notes

• WSFU values represent the hydraulic load imposed by each fixture on the water supply system.
• Cold and hot WSFU are tracked separately for independent cold and hot water pipe sizing.
• Flushometer valve fixtures have higher WSFU in public occupancies due to higher flow rates.
• Custom fixtures can be entered with user-specified WSFU or direct flow rates.

IPC Pipe Sizing Guide

Step-by-step explanation of the IPC table-based pipe sizing method, from WSFU summation through flow conversion to final pipe selection using Table E104.1.

WSFU Calculation Guide

Understanding WSFU is fundamental to plumbing design. This guide explains what WSFU are, how different codes define them, and how Plumbing Booster uses them for pipe sizing.