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Environment Canada estimates the distribution of domestic consumption as shown in Fig[http://www. 11-1ec.Fig 11gc.ca/eau-1 Distribution of domestic water consumption© / Environment Canada http] estimates daily per capita usage as 79 gals. <ref>https://www.ec.gc.ca/water/imagesindicateurs-indicators/manage/effic/a6f7edefault.htmasp?lang=en&n=7E808512-1</ref>
→Calculating Water Capacity
Other yachting estimates are as high as 15 gal a day per person. At the other extreme, one 400-passenger cruise ship, the <i>MV Millennium Queen</i> (believed broken up in 2001), budgeted 60 gal per day per passenger, which is close to domestic consumption. Domestic consumption is a benchmark for a live-aboard, but estimates still vary widely.
For a standard office, guidelines are 25 gal/day per person but have been shown to be as low as 6.8 with conservation measures [3]<ref>http://ncprojectgreen.com/</ref>. Of course, office estimates don’t include cooking, showering and washing clothes, etc.
For domestic consumption, [http://www.watertechonline.com/ WaterTech.Online ] also recommends 25 gal/day per person [4] but [http://www.nrcan.gc.ca/ Natural Resources Canada ] (NRCan) estimates real usage as 88 gal/day [48].
NRCan says average daily consumption is 1000 L/day (264 gals) for three people with 40% for toilets. This puts Canadians among the thirstiest on the planet. Must be all the Beer! More Beer! My toilet flushes with 1.6 gal so NRCan assumes I hit it 22 times a day, or about every 45 min. Putting aside the toilet jibe, I find 88 gal realistic, as shown later.
Vendor specifications also indicate that many marine toilets require 3-5 gal per flush, with the most efficient (VacuFlush) requiring only 0.375 10 gal (./0.8 L)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 [49].
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.
Other capacity recommendations for hot water tanks range from 7 gal per person [2] to as high as 17 gal.
In tests in my apartment taking showers not baths I observed a daily consumption of about 40 gal. Taking a bath (52-in bath) quickly jacked the number up into the NRCan realm. These are the results of the tests: