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→Calculating Water Capacity
[http://www.ec.gc.ca/eau-water/ Environment Canada] estimates daily per capita usage as 79 gals. <ref>https://www.ec.gc.ca/indicateurs-indicators/default.asp?lang=en&n=7E808512-1</ref>
Vendor specifications also indicate that many marine toilets require 3-5 gal per flush, with the most efficient (VacuFlush) requiring only 0.10 gal./0.39 liter.<ref>http://www.dometic.com/USA/MS-11346-Marine/PG-11395-Toilet-Systems#q2</ref> The more profligate ones can use seawater but VacuFlush requires fresh water.
Other sources estimate that domestic hot-water consumption alone runs 20-35 gal/day per person, with a peak demand of 10 gal. To meet such a peak demand, the [[HotWaterHeater|hot water heater]] must deliver 10 gal/person at any time. Additional capacity is needed for appliances, such as dishwashers.