Water can be pasteurized in black pots or jars in solar cookers using a batch process where once the water has reached pasteurization temperature, the jars and pots are removed from the cooker and allowed to cool before drinking. A flow-through pasteurization device, however, can pasteurize more water in a given time period for the following reasons:

1. The hot pasteurized water exits the cooker into a simple heat exchanger where much of its heat is transfered to the cold water that is entering the cooker.
2. The thermostatic valve opens precisely when pasteurization temperature has been reached (with some safety margin). This means that the water is never heated to a higher temperature than is necessary to make it safe to drink.

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