If you own an AO Smith water heater, you probably expect endless hot showers. When the water turns cold or the unit keeps resetting, it can feel like a nightmare. The good news? Most issues are fixable with a little know‑how, and even the big decisions, like when to replace, become clearer when you understand how these heaters work.
First, check the reset button. AO Smith models often have a safety reset that trips if the thermostat overheats. Press it once; if the water heats, you were lucky. If it trips again, you likely have a deeper issue such as a faulty thermostat or a blocked burner. Turn off power, let the unit cool, then inspect the burner for soot. A quick clean with a brush can restore proper flame.
Another frequent complaint is lukewarm water. This usually means sediment buildup inside the tank. Over time, minerals settle at the bottom, reducing heating efficiency. Flushing the tank once a year solves the problem. Shut off the water supply, attach a garden hose to the drain valve, and let the water run until it’s clear. This simple step can add years to your heater’s life.
Manufacturers quote 10‑15 years, but real‑world experience varies. If you keep up with annual flushes, check the anode rod every two years, and address any error codes promptly, you can push the lifespan toward 20 years. Some owners even report 30‑year units that still work because they’ve been meticulous about maintenance.
The anode rod is a sacrificial metal piece that fights corrosion. When it’s consumed, the tank starts to rust from the inside out. Replacing the rod is cheap—often under £30—and can extend life dramatically. If you hear rumbling or notice rusty water, swap the rod right away.
When the heater finally gives up, weigh repair costs against a new unit. Replacing a faulty thermostat or heating element usually runs under £150, while a full replacement can start at £700. If the heater is older than 12 years and repairs exceed 20% of a new unit’s price, it’s time to consider a fresh AO Smith model.
Remember, safety matters. Never attempt gas‑related repairs unless you’re a qualified engineer. For electric AO Smith heaters, turning off the breaker before opening panels protects you from shock.
In short, keep an eye on reset trips, flush annually, check the anode rod, and don’t ignore error codes. With these habits, your AO Smith water heater will keep the hot water flowing for years, saving you both time and money.
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