A water delivery apparatus

A water delivery apparatus for use at a household appliance, the water apparatus comprising:

• an air-tight water storage unit configured to store water;
• an air channel configured to allow air to enter the water storage unit at a predetermined height level so as to regulate the water pressure in the water storage unit;
• and
• a water delivery tube comprising a first end and a second end, wherein the first end is connected to the water storage unit, and the second end is connected to a component of the household appliance at which water is utilized for performing a function of the household appliance, and
• a flow adjustment unit arranged at the water delivery tube, the flow adjustment unit being configured to reduce or increase the inner diameter of at least a part of the water delivery tube,
• wherein the water delivery tube is arranged such that its second end is lower than the predetermined height level, and the height difference causes water to flow from the water storage unit to the component of the household appliance, and the rate of water flow from the water storage unit to the component is based on at least one of:
• the extent of the height difference, the inner diameter of the water delivery tube, and the length of the water delivery tube.