So I was thinking of doing the same thing but with the winters and it getting so cold the only thing I could comeup with to keep the water from freezing in the pipes is a heat tape and not sure how that would work.. Yes the pipes and the nipples need to be cleaned also not sure how often.
In the winter I plan to add a secondary water supply - a fount with a heated base.
The first year I used pipes and tubes for my nipples. I won't use pipes or tubes again. It is hard to get the algae out of them and in the winter when I was not using the nipples in the pipe the little bit of water that was left in the pipes froze and pushed some of my nipples out. To me the 5 gallon bucket works great year round.
I still have not tried to teach my birds to use the nipples yet. I have it. I just need to spend the time and do it. It has just been so hot.