To Boil or not to Boil

I have been thinking about future brews and have decided to revert to a method I used when I was brewing beer from kits. This involved the use of bottled water to top up and also cool the hot wort. This method would add a further £2 to each brew. However, it would mean that I would save on electricity costs by not having to boil some 20 litres of tap water. I could also put the bottled water into the fridge before use. Hopefully this would help to cool the hot wort faster. This would reduce the risk of infection before the wort is cool enough to add the yeast. Also as an added bonus it would help to aereate the wort before the yeast goes in. For yeast to work properly and get going quickly it needs lots of oxygen. There is to be another brew day next Monday so I will try it then. I am feeling quite smug at the moment. I hope my smugness does not come unstuck next Monday! Oh well we will no doubt see.