The Kranzle K1322TS/K1122TST/K1622TS will actually draw from a tank on their own as they have a self-priming pump. The Kranzle manual states that it can pull water from up to 1m below, but we haven't tested that yet. Basically, anything that is level with your tank, or keeping the machine slightly under will work perfectly. DO NOT use an external pump as this can actually cause issues with the Kranzle. Also, be sure to note the power requirements on the product page. You'll need at least a 4800W generator to run a Kranzle.