Here is another cooker that gives you control over the temperature at which your food is cooked. The Tescom TLC70A Core Temperature Smart Cooker is pretty easy to use. Just put the ingredients in a sealed bag, put it in the main compartment, and you are set. No need to use any water.
This cooker has two modes (40-85C and 40-95C). It is 360W rated. You can find out more here.