Hot and cold water dispensers go together like ebony and ivory -- well sort of. They work in perfect harmony, at least. While they all do the same thing, models differ as to how water is dispensed. Some dispense hot and cold water through one spigot. The cold water can be hooked up to a chiller. Alternatively, both supplies can be hooked up to a water treatment system. This set up eliminates the need for having a separate purified cold water spout at the sink. If your sink does not have a mounting hole for a new faucet, you can replace a purifier spout with one of these and enjoy the best of both worlds.