Putting it underneath is something I considered but  the issue with putting it *under* the hover is that I'll have to pick up one entire end of the brooder to fit the fountain underneath it.  Not a deal-breaker, but I feel like there might be a better solution.  The recommendation on the page i got the instructions from is to put the quart jar water foutains at the edge for the first week, and then after that  move them a foot or so away from the brooder to encourage the chicks to move around more.  The whole design/idea was tested at ag. stations in Ohio, and I'm pretty sure they don't have 20 degree temperatures in March down there, so some of this I'm tyring to puzzle out.  They discuss keeping the *brooder* warm in freezing temperatures, but not how to keep the water from freezing.