The main technical difference between the water supply devices is the water cooling technology. While preheating is standard in all models – by means of a hygienic tank with an electric heater heating the water to 85°C-95°C, cooling is conditionally divided into compressor and electronic. It is important to note that in both options, the water has NO CONTACT with the coolers themselves. They are housed around the outer shell of the hygiene.
Compressor cooling is the more efficient and reliable method. Comparable to refrigeration in refrigerators and air conditioners, compressor cooling in water delivery units uses a compressor system with Freon gas. Compressor-cooled units are suitable for home use as well as for offices and businesses with heavy and light loads. The water from the bottle falls directly into a hygienic tank around which the Freon coolers pass, where the cooling process takes place. The compressor cooling competences allow an extremely large flow of water to be cooled without the cooling level dropping. The standard cooling capacity is to produce about 3-5 litres of chilled water in 1 hour. The standard factory setting provides for cooling to be between 5°C and 7°C , but the precise setting may vary depending on the user’s preference. Ambient temperature has almost no effect on cooling. Compressor cooled units have a significantly longer life. Under normal operating conditions, they can provide trouble-free use for more than a decade.
Electronic cooling is suitable for devices  that are subjected to light loads. These are the ones used in homes and small offices with up to 3-4 people. Cooling takes place in the hygienic tank, on the outside of which a Peltier element is placed. This is a ceramic tile that contains many PN transitions. When energized with an electric current, one side of the Peltier element is cooled and the other is heated. The cooling side is placed facing the hygiene tank, which contains the water. The heated side of the tile needs to be cooled by placing a radiator and fan. In order to facilitate the air circulation and cooling process, electronically cooled units must be placed at least 10 cm. the distance between the rear of the apparatus and other objects, such as walls. The Peltier element cools the water to between 5°C-12°C, but the ambient temperature has a serious effect. The cooling capacity here is about 700ml. in 1 hour. It is important not to exceed the capability of the electronically cooled apparatus, as this will overload the cooling system and possibly cause damage. The electronic cooling system has a lower cost than compressor cooling and therefore the units are available at noticeably lower prices, which is their main advantage.