What is the lifespan of a Rheem tankless water heater is 20 years with proper maintenance including annual descaling and filter cleaning, which is significantly longer than tank water heater at 10 to 12 years and similar to other tankless brands like Rinnai and Navien at 20 years. Rheem tankless models including RTG-64 non-condensing and RTGH-84 and RTGH-95 high efficiency condensing are built with copper or stainless steel heat exchangers designed for 20-year service life. Lifespan depends heavily on water hardness, maintenance, and usage. In soft water areas under 7 grains per gallon with annual descaling with vinegar flush costing 100 to 200 dollars DIY, lifespan is 20 to 22 years. In hard water areas over 7 grains without water softener and without descaling, mineral scale builds up inside heat exchanger causing overheating, reduced flow, and error code 11, reducing lifespan to 10 to 15 years and causing premature heat exchanger failure costing 500 to 1,000 dollars to replace. Other factors include proper gas supply with 3/4 inch line for 199,000 BTU models, correct venting, and annual burner cleaning. Rheem offers 12-year heat exchanger warranty and 5-year parts warranty indicating expected long life. To maximize lifespan, install water softener for hard water at 500 to 2,000 dollars, flush with vinegar every 6 to 12 months, clean inlet filter monthly, and schedule annual professional service at 100 to 150 dollars.
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