Not enough pressure

If the Bellman milk steamer doesn’t seem to have enough pressure when steaming milk, this is usually an indicator that it has not been left on heat for long enough and/or the burner is not big enough or is set too low. The Bellman steamer will start hissing from the release valve in the handle when it has reached full pressure and is ready to use. When starting with boiling water in the steamer, full pressure should be achieved in 6 to 8 minutes. When starting with cold water it should reach full pressure in 12 to 14 minutes.