Thanks....probably knew that answer but thought I would ask.
Easier to figure out as 1 US gallon is 4L (I know...really 3.78), just psyched myself out when I was doing a leak test on my brew kettle I got from OBK, just checking for any leaks, needed some more thread sealer than what they put on it, and the male to male coupler needed to be reset as there wasn't enough threads to screw on the bazooka screen. So now it is ready to go for my first batch on the weekend.
Was curious to see how long it would take to boil. So using a 4L water container (which is got me to thinking about US vs UK gallons), took about 30 mins to bring to a boil on the stove. Not bad....can't wait for my propane burner though!