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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.

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Related: System curve for use in determining pump operating point

The smaller lines will increase the resistance to flow, which will decrease the flow rate. The use able head is reduced, but this wouldn't be a problem with such a low flow rate. However, the lines will still flow, just at a reduced flow rate.

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