I have my reservoir filled with water almost at the top, what happens if the water expands

[chikeN456]

should i take some water out? i have a 160mm res and itscurrently pretty much all filled up,

 

[the nerd 389]

Between room temperature and 80C, water expands about 0.9%. Considering how insane a water temperature of 80C is, this is negligible.

Plus, water isn't the only thing that expands when heated. The reservoir, tubes, waterblocks, pump, etc. will as well.

 

[chikeN456]

Thanks for an informative answer!