A:
This unit will be fine for heating 5 L of water.
Adjusting the heat output on these units will require a controller. There are several different types of controllers, but generally you can use a variable-voltage output controller, such as item 36225-59, to control the voltage input to the element; which corresponds to temperature output. An alternative would be a unit that uses feedback from a temperature sensor to adjust the output, such as items 36225-90 or 36225-61.
Answered on 1/2/2013 by Jay from Customer Service