Despite their high energy efficiency and endless hot water supply, tankless water heaters have several notable disadvantages. Major drawbacks include significantly higher upfront equipment and professional installation costs compared to traditional storage tanks, the requirement for dedicated gas line sizing or electrical panel upgrades, a slight delay before hot water reaches distant fixtures, and the absolute necessity of performing annual descaling flushes to prevent hard water mineral scale failure. Verification: Evaluate installation quotes and water hardness levels before purchasing a tankless system.
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