The sticker on your water heater says it's good for 12 years. In Phoenix, you'll be lucky to see 10 unless you flush it annually and check the anode rod every two years. At Phoenix Plumbing Co. we bake that flush into every annual plumbing inspection so it actually gets done.
Tankless heaters fare better — 15–20 years — but only if you descale them every 12 months. Skip that and the heat exchanger fills with scale and fails out of warranty. Our water heater service team handles both flushes and descales on a scheduled plan.
Watch for: rust-colored hot water, popping or rumbling sounds, slow recovery, or any moisture at the base of the tank. Any of those means call us for a free assessment.
Lifespan is only half the decision, though. Once your tank hits that 8-to-12-year window, the smarter question is what to replace it with, because in our hard water a tankless unit can double your years between replacements. I walked through the costs, the trade-offs, and a story about two neighbors who chose differently in my guide to the tankless vs. tank water heater question for Phoenix.
Have a plumbing question this article didn't answer? Call Phoenix Plumbing Co. — a live Phoenix dispatcher picks up, and we'll give you straight advice on the phone.