The isometric below shows a water heater feeding a 3/4-inch hot water main that splits into three 1/2-inch branches serving a lavatory, a kitchen sink, and a bathtub. The UPC's Table 610.3 publishes one WSFU value per fixture, covering the fixture's combined hot and cold load. Using private-occupancy values, what combined WSFU total does the table list for these three fixtures?
WATER HEATER
|
3/4" HW MAIN
|
+---------+---------+
| | |
1/2" hw 1/2" hw 1/2" hw
| | |
[LAV hw] [SINK hw] [TUB hw]Not quite. The answer is C: 6.5
Table 610.3 lists a single total per fixture — 1.0 for the private lavatory, 1.5 for the private kitchen sink and 4.0 for the bathtub — which adds to 6.5 WSFU. If a designer needs the hot-only load on a branch, the table's notes allow taking three-quarters of a fixture's listed total, but that is a calculation the designer performs, not a second number the table publishes.
Reference: UPC 2021 Table 610.3 (Water Supply Fixture Units)
Checked against multiple published sources
The Seattle copy marks this table's heading as a city amendment, and WAC 51-56-0600 does not amend it, so we treat the values as the base 2021 UPC figures. The exam supplies this table at the desk.