For the record, 4 years in a row, no pump issues. I do remove the flagstone lip on the falls and rearrange a few boulders to create a flat, sheet of water coming out of the falls. The issues with burnt out pump come when the ice forms dams and diverts water out of the pond. If the falls does not splash that much, you will be fine. I will post before and after pics. of my falls to show how it runs. I used a cow through heater once, the first year. It shorted out when I was on vacation and the pond froze over, never again w/them. 3 Koi and a handful of goldfish casuaities made me re-think winters here in Chicago where weeks of below zero are not uncommon. If you do go that route, I would suggest getting two in the event one does crap out. I personally would go with a solids handling pump that is placed below the surface and points upward.