If your water heater is more than a decade old and you have started noticing rust-colored water, strange rumbling sounds, or running out of hot water faster than you used to, you're not imagining things. Water heaters wear out, and unlike a lot of appliances, they tend to fail catastrophically. A leaking tank can dump 40+ gallons of water onto your floor in minutes.
The good news is that water heaters almost always give you warning signs before they fail. After 40+ years of replacing water heaters across Marietta, Smyrna, and the rest of Cobb County, here are the five we tell every customer to watch for.
Why it matters in Cobb County.
Georgia water is hard. It's full of dissolved calcium and magnesium that builds up as sediment at the bottom of tank water heaters over time. That sediment shortens lifespan, reduces efficiency, and is a leading cause of premature failure in this area. The average water heater in Cobb County lasts 8 to 12 years, on the lower end of the typical national range.
Catching the signs of a failing unit early gives you time to plan a replacement on your schedule. Not at 11 p.m. on a Saturday with water pouring into your laundry room.
The five signs.
Your water heater is 10+ years old
Pull up the serial number on the unit. The first letters and numbers usually encode the manufacture date. Most tank water heaters have a usable lifespan of 8 to 12 years. Tankless units last 15 to 20. Once you're past 10 years on a tank, you're on borrowed time. Even if it's working fine right now, start budgeting for a replacement so you don't get caught off guard.
Rusty, brown, or smelly hot water
If the cold water from your faucets is clear but the hot water comes out tinted brown, rusty, or with a metallic smell, the inside of your tank is corroding. This is one of the clearest signs the tank itself is breaking down. Once corrosion starts, it doesn't reverse. Replacement is the right move.
Rumbling, popping, or banging sounds
Sediment at the bottom of the tank traps water under it. As that water heats up, it boils through the sediment and causes those distinctive popping or rumbling noises. Annual flushing helps. If your tank is loud and old, it has likely lost significant capacity already and is heading toward failure.
Running out of hot water faster than you used to
Did your morning shower used to last twice as long? Sediment buildup reduces the actual usable volume of your tank. A 50-gallon tank may only be holding 35 gallons of water by year 10. If your hot water runs out faster, your tank is likely shrinking from the inside.
Visible moisture or leaks around the base
This is the urgent one. Even small puddles, dampness on the floor, or rust streaks down the side of the tank mean water is escaping. Once a tank starts leaking, full failure is usually days or weeks away. If you see this, call us right away. Catching it before catastrophic failure could save you thousands in flood damage.
Repair vs. replace: how to decide.
A common question we get: can a failing water heater be repaired? The honest answer depends on three things:
- Age of the unit. Under 8 years old, repair is usually worth it. Past 10, replacement almost always makes more sense.
- Cost of the repair. If a repair costs more than 50% of a new unit installed, replace it.
- What is failing. A faulty thermostat or heating element? Easy repair. A corroded tank? Replace.
Pro tip from our team
If your water heater is over 10 years old and you're already paying for a service call, it's almost always worth replacing it during the same visit. The labor cost of a second service call plus another repair usually outweighs the difference between fixing and replacing.
What to do next.
If you're seeing any of the warning signs above, take these steps:
- Locate your shutoff valves. Know where your water heater water supply valve and gas or electric shutoffs are. If you ever see a leak, you will need them fast.
- Check the age. Find the serial number on the manufacturer label. The first few digits encode the date.
- Call us for an honest assessment. We come out, inspect the unit, and tell you exactly what is wrong. Then you decide whether to repair or replace.
The cost to replace a water heater on your schedule is always less than the cost to replace one that just flooded your house.
If you would like us to take a look at your water heater, we offer free written estimates on water heater repair and replacement across all of Cobb County. Call us at 770-439-0919 or request a quote online.
