Neither the EN250 standard nor the US Navy unmanned test procedures use any kind of real world human diving scenario as the basis for testing, including cold water testing. The US Navy procedure has been to test regulators primarily at a depth of 190 fsw (58 msw) in water at a very high breathing rate of 62.5 lpm for a minimum of 30 minutes, with inlet pressure to the first stage of , which results in an average second stage inlet temperature of around , compared to an average of if would be used.
