Boiling water would not have the same effect as an RO unit. Like you may already know.
Some bacteria might be removed, but trace elements and impurities would'nt (from my knowledge). Best to stick to RO as its a purer (sp?) form of water.
Plus, boiling water would take a considerable amount of effort. I know i wouldnt want to waste all that gas either. RO 'wastes' water, but the by product can be used on gardens or in your washing machine.