Make it clear whether you want the hot water feature also in advance in a water cooler. Many of the buyers are attracted with the idea to get the cool water and the hot water, as well, to make hot drinks. In real, if the water can be boiled quickly using the electric kettle, then you need not pay extra for the cooler having two fold functions. But, still, the model with both the functions of dispensing hot and cold water may prove cost efficient in the long run.
One should focus on the water cooler working with different sized bottle, thus, giving you more flexibility when purchasing supplies. You will be sure to get the amount of water you need at any time. It will be good if the model is working with bottles of 2, 4 and 5 gallons.
Choose the model having reservoir of stainless steel. Its recommendation is to avoid the taste of plastic that are typical with the plastic reservoir. Reservoirs of stainless steel are not much expensive and can contribute to the quality the potable water in your office or home.
Water coolers having filtration are very much recommended. However, they cost more, but you will get the pure and fresh drinking water without any contaminants. Go for the model that filters the bacteria like Cryptosporidium and Giadia also filters the harmful chemicals.
Also, do not forget to ask for the cool waters temperature while shopping for the coolers. In reality, the different temperatures are produced by different models. You should be sure that the water you get is neither very hot nor very cold. It should also be kept in mind that the user can't regulate the temperature so you should be careful while choosing the one for you.