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Scottsdale's water hardness by area, and what it means for a tankless heater
[Author: Mike or Dan, with photo] · Water quality · Oct 15, 2026 · 1 min read · Updated Nov 12, 2026
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The City of Scottsdale lists hardness from 16 to 18 grains per gallon north of Chaparral Road to 22 to 25 south of Indian School Road. Carefree Water Company reports 14 to 16.
Why tankless heaters care
Hard water scales the heat exchanger. A yearly descale keeps the unit efficient, and many manufacturers require it for the warranty.
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