Think about what will happen if the pump leaks. I've had two seal failures, one
after a couple of years, one after 3 months, and between these have twice had
screw connectors shake themselves loose. These used to soak the cardboard boxes
of stuff in the loft before dribbling down and staining ceilings. My pump now
sits in a small cold water header tank, with a drain connected to the normal
header overflow.