A water heater that heats water only when you need it, rather than maintaining a standing tank of hot water. Advantages: never run out of hot water, 20–35% energy savings, longer lifespan (18–25 years). Disadvantages: higher upfront cost, may require gas line upgrade (for gas units) or electrical panel upgrade (for electric). Prone to scale buildup in hard-water areas — annual descaling recommended.
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water heater replacement