In our model, the dwarf planet Pluto, which is 40 au's away from you he sun in real life, is about 11 inches from the sun. If we were to add the closest star- Proxima Centauri( which is 4.3 light years away from our sun, and 1 light year equals 65,000 AU's),approximately how much longer would our model have to be?

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.