How long does Noritz tankless last is typically 15 to 20 years with proper maintenance, longer than tank water heaters which last 8 to 12 years, with Noritz being Japanese brand known for durability. Noritz Corporation, founded 1951 in Kobe, Japan, makes tankless water heaters with durable copper and stainless steel heat exchangers, designed to last long, with warranty 12 to 15 years heat exchanger, 5 years parts, indicating expected life. With yearly flushing to remove scale using vinegar for 45 to 60 minutes, cleaning inlet filter, and proper installation, Noritz tankless water heaters can last 20 years or more, with many customers reporting 18 to 22 years life, with commercial units lasting 15 years with heavy use. Factors affecting lifespan include water hardness, with hard water causing scale reducing life if not flushed, usage frequency, with heavy use reducing life, and maintenance, with regular flushing extending life, and installation quality, with proper venting and gas pressure. Compared to tank water heaters lasting 8 to 12 years, Noritz tankless lasts almost double, with energy savings over life. So Noritz tankless lasts 15 to 20 years with maintenance, with some lasting 20 plus years, with 15 year heat exchanger warranty, with yearly flushing recommended to achieve 20 year life, making Noritz long-lasting water heater.
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