MW Equations + Phase Change in 4.2

Hi,

I am using microwave heating option of the RF module for heating a mixture of oil and water.Can any body let me know which set of equations COMSOL is using to solve the microwave heating problem?

I have consulted the tutorial of microwave heating and it shows only one equation for solution of electric field but I need the other equations too such as how it is calculating the temperature distribution , power density etc. in the model?

Secondly, does any one know whether COMSOL 4.2a is considering the phase change of material with temperature or not such as conversion of water to steam at 1 atm at 100 degree Celsius temperature?

Thanks for any response!