The water supply device in 19l. bottles are divided into two types, depending on their height. Self-standing are the devices that are placed directly on the floor. Their height is suitable for comfortable use. The sizes of the self-contained device vary depending on the model and are determined by user preference. Some versions have a cabinet at the bottom. The desktop units are conventionally called low. In the most common case it is conveniently placed on a stand, shelf, kitchen bar or other suitable furniture. In case of limited space and choice of a table-type apparatus, it is important to consider the height of the bottle to be placed on the apparatus – about 50cm.
Types of taps and buttons to activate the water supply.
The valves that are used to start and stop the water supply from the apparatus are conventionally called taps and buttons, depending on how they are activated. Mechanical taps can be top- and bottom-pressed, with the advantage that they can be left open without the user having to hold them the whole time they are filling their cup. Replacing mechanical taps is considerably easier. Button machines look more elegant and clean, but they need to keep the button pressed all the time of filling. Some models are equipped with electronic water supply buttons.