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Figure 13. Central restroom sink hot water use profile

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Fraction of Total Daily Usage

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Hour of Day Figure 14. Combined domestic hot water use profile

For the central restroom in a multi-family building, the daily use depends on the number of full- time employees as well as the number of guests that come to look at the facilities (which can vary based on number and price of units, economics, and marketing). If these parameters are unknown to the analyst, three full-time employees may be assumed, each using the restroom three times per day, and 21 visitors, of whom one in three use restroom facilities (Gleick et al. 2003).

Based on these numbers, Figure 13, and values from Table 10, the total hot water consumption is a constant 11.3 gal/day for weekdays and Saturdays, and 0 gal/day on Sundays. This is equivalent to 3,526 gal/year.

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