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Bosch tankless water heater is divided into two groups: whole house and point-of-use. Whole house water heaters are designed to provide hot water into large areas. This system more expensive than the point-of use models but it can operate more water systems at a time.. Point-of-use system on the other hand is recommended for providing hot water in small areas. They can only provide one or two outlets. Because of its compact size, point-of-use systems fit small areas like a cabinet or a closet. This can also do favor on your wallet since point-of-use systems has little water loss rate during lag time compared to the whole house water heaters.