I ran water over 30 feet to my sump but it was directly from the RO/DI system. The problem you are going to have is that a) you need to be as level as possible, to reduce head loss and b) you can't be OVER said level or you'll create a never ending siphon.
I'm not familiar with the Tunze 3155 Water top off system, but I can tell you that the system I use, from autotopoff.com would work fine. It is a simple double switch system that is done by a 15 Amp relay, allowing you to use a device rated up to 1800 watts. You could use a larger pump to move water over that distance.
Again, watch for siphon.
Dave
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