A Bosch tankless water heater should comfortably last between eighteen and twenty-five years when the equipment is properly sized, professionally installed, and maintained with regular annual descaling flushes. This impressive operational longevity drastically surpasses traditional storage tank water heaters because Bosch tankless units heat water strictly on demand, minimizing constant water pressure stress and interior tank corrosion. Furthermore, individual modular components can be easily replaced as they age, allowing the primary heat exchanger to continue operating dependably for decades.
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