This water cooler (M24i from Danish Zegotech) goes under your counter and provides cold drinking water to your drinking water faucet. It is energy efficient (A+), quiet, built to last and lives hidden inside a ventilated subcounter cabinat.
It provides on-demand 0,5 liter per minute at 2,5C. That’s cold!
This solution requires a pump with a pressureswitch that goes on, when you open the faucet.