I got a mini-project: I want to automatically get rid of the water produced by an indoor air conditioner unit. Since the unit is underground, the water needs to climb ~2m to get to the outside.
I found a cheap pump online that has a max head of 3m and flow rate of 240l/h, the pipes on it have 6mm on the inside diameter. I also have some tubing left over from a gardening project but its 4mm on the inside.
I can figure out how to fit the two together mechanically but since the tubing is tad too small, wouldn't that increase the pressure requirement and thus decrease the max head?
I really don't mind if it affects the flow rate, the amount of water I need to pump out is ~2L/day max so I'm adding a microcontroller to turn it on for just a few minutes out of a day anyways.