Let the keg reach temperature first
A freshly inserted keg needs time to cool to the dispenser’s serving temperature — pouring immediately after insertion is the most common cause of an excessively foamy first glass.
Tilt, then straighten
Start with the glass tilted at an angle under the tap, and gradually bring it upright as it fills — this controls head formation the same way it does at a professional bar tap.
Open the tap fully, not partially
A partially open tap increases turbulence in the pour, which increases foam. A fully open tap, controlled by how long it’s held open rather than how far, generally gives a cleaner result.
Clean the line if pours stay foamy
If foam persists across multiple kegs after the temperature has settled, a buildup in the dispensing line is the likely cause — see our advice on cleaning a beer dispenser line.
What we would not do
Assume a foamy pour means the dispenser is faulty. In nearly every case it’s technique, keg temperature, or a line overdue for cleaning — genuine hardware faults are the less common explanation.
What readers ask us
Why does my dispenser pour mostly foam on the first glass after inserting a new keg?
A newly inserted keg usually hasn't reached the dispenser's target serving temperature yet, and the line may still have air in it from the swap — both settle down after the first pour or two, which is a normal part of changing kegs, not a fault.
Does the angle I hold the glass at actually matter?
Yes — starting with the glass tilted and gradually straightening it as it fills is standard technique for controlling head size, the same principle bartenders use at a tap, and it applies to a compact home dispenser just as much as a full bar setup.
Last reviewed 25 August 2026
