This year we're thinking of adding a low flow/drip irrigation system to the greenhouse; we're looking at the systems Lee Valley has.

I would like to do something that is gravity fed as the greenhouse doesn't have power and is fairly far away from any source of power. (The husband doesn't really want a gravity fed system but I don't want the hassle of messing with extension cords or generators every day, I might as well hand water then because it would probably be faster in the end.)

Does anybody have a gravity fed system for their greenhouse? or another system? What works for you?