Installation guide

Rinnai Continuous Flow Water Heating Specication Guide 02-13 | 57
Appendix 3: Commercial sizing guidelines
Sizing guidelines for commercial applications when using secondary storage tanks
The table below, based on industry experience, provides average hot water demand for various applications. The
demand for hot water is dependent on the following:
- Occupancy classification of the building
- Number and type of hot water outlets
- Number of persons accommodated
- Time of day
Building type Hot water demand at 60 °C (unless otherwise noted)
general accommodation
Hotel/motel 4 and 5 star accommodation 45 litres per person per peak hour
Hotel/motel 3 star accommodation 30 litres per person per peak hour
Hospitals, nursing hotels, backpackers 35 litres per bed over a peak hour period (mixed water at 45 °C)
eateries
Hotel kitchens and cafeterias 5.5 litres per meal over a two hour peak period (temperature required 85 °C)
Sandwich shops and snackbars 3 litres per meal over a two hour peak period (temperature required 85 °C)
apartment buildings
General 25 litres per person
One bedroom ( 2 people) 50 litres per peak hour
Two bedrooms with ensuite (3 people) 75 litres per peak hour
Three bedrooms with ensuite (4-5 people) 110 litres per peak hour
Penthouse with two ensuites and spa 150 litres per peak hour
schools
Primary and secondary 4 litres per student over eight hours (mixed water at 45 °C)
Boarding 30 litres per student per peak hour
office amenities
4 litres per person over eight hours
car washes
75 litres per bay per cycle
laundries
Coin operated machines 70 litres per machine per hour
Commercial laundries (machines up to 50 kg capacity) 6-8 litres per kilogram of dry washing
Table is provided to serve as a guide only