I'm looking to put this in my smaller tanks, and maybe using some kind of valve to adjust the flow.
What's the diameter of the tubing in the Toms? How about the Zoomed?
I was also thinking of using several of these to make a centralized filtration system for my smaller tanks. That way, I could have the heater in one spot and make it a sump. I could use the filter to draw the water from the main tank and place it in the sump, which heats the water. Then a small pump would draw the water from the sump and return it to the main tank.