If it is run very frequently, there is no opportunity for anything to start growing in there, as pointed out. The water reservoir is also VERY small; if you pour in even the smaller 3oz amount needed for the 6hr cycle the water fills the reservoir and comes up into the chamber of the unit. There isn't this huge area underneath where water can pool, etc.
When I won't be using it for a longer period of time, I rinse it out well, pour enough rubbing alcohol in to fill up the chamber, let it soak for a bit, dump out and let it air dry upside down in my dish rack. I really don't know how good this is for the heating element but I don't care- I don't want old water sitting in there and I know the alcohol both sterilizes and evaporates quickly. I rinse it out a few times before I use it the next time.
I have to admit I like the exposed pan in the Nuk better. Now that Avent has some competition in this sterilizer market, I wouldn't be surprised if they redesign the base... that is SUCH a clear point in Nuk's favor.
When I won't be using it for a longer period of time, I rinse it out well, pour enough rubbing alcohol in to fill up the chamber, let it soak for a bit, dump out and let it air dry upside down in my dish rack. I really don't know how good this is for the heating element but I don't care- I don't want old water sitting in there and I know the alcohol both sterilizes and evaporates quickly. I rinse it out a few times before I use it the next time.
I have to admit I like the exposed pan in the Nuk better. Now that Avent has some competition in this sterilizer market, I wouldn't be surprised if they redesign the base... that is SUCH a clear point in Nuk's favor.