Partsrep...
No, I don't pump from basement to first floor. The tank is on the first floor.
Instead, I run the hose from first floor to the basement, down through a hole in the floor that originally held the pipe to a radiator (I think). Pretty handy hole!
The Maxijet fits loosely in the hose, so I don't think it would work fighting gravity. But, a more powerful pump would.
Big time saver. Can't believe I used to lug buckets.
It's too complicated to get into (or too tedious!!) but I'm setting up a 125 in a different location on the first floor, and I'll empty to basement and then refill from 2nd floor bathroom faucet, using the same hose. (Drag back up from basement hole, hook up to 2nd floor faucet).