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plumbing12 -sizing for water heater

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sizing for water heater: The minimum capacity for storage water heaters shall be in
accordance with the first hour rating listed in Table 501.1(1).
2015 UNIFORM PLUMBING CODE page 39. definitions: first hour rating:(FHR) in gallons, is determined by running a Department of Energy specified test with the average water temperature in the tank set to 135°F (+/- 5°F). A draw of three gallons per minute starts and then discontinues once the hot water outlet temperature drops 25°F. The water heater is then allowed to recover back to the 135°F setting and the process continues repeatedly until one hour elapses. The sum of the amount of hot water drawn during the test is the First Hour Rating. take form energy guide like picture:
full bath(=1 bathroom): is a bathroom or washroom that has a sink, toilet and a shower or bathtub. 
A half bathroom( 0.5 bath room): is a bathroom which has a sink and a toilet, but no shower or tub.