Water heaters have a habit of failing in the least convenient way possible — cold shower on a Monday morning, a puddle in the garage on a Sunday night. Before you spend money on either a repair or a replacement, the first question to answer is which one actually makes sense for your Marietta home.
The age rule
Standard tank water heaters last 8–12 years in Marietta. Tankless units last 15–20 with proper maintenance. Age alone doesn't force a replacement, but it heavily weights the math: a repair on a 4-year-old heater is usually worth it, a repair on a 13-year-old one usually isn't. Find your unit's age on the manufacturer's label — the serial number encodes the manufacture date on most brands.
Symptoms that almost always mean REPAIR
- Gas pilot won't stay lit (usually thermocouple or thermopile — inexpensive)
- No hot water on an electric heater with breakers still on (usually a failed heating element)
- Popping or rumbling noise (sediment buildup — flush the tank)
- Water not hot enough (thermostat adjustment or replacement)
- Slow recovery time (dip tube or element on electric; burner issue on gas)
- Pressure relief valve dripping (valve replacement)
Symptoms that almost always mean REPLACE
- Water leaking from the tank itself (not from a fitting or valve — from the tank body)
- Rusty or discolored hot water (internal tank corrosion)
- Unit is over 10 years old AND needs a significant repair
- Repeated repairs on the same unit within a short window
- Cracked or bulging tank
The 50% rule for Marietta water heaters
A rule of thumb we use with Marietta homeowners: if the estimated repair cost is more than 50% of a comparable new-unit installation AND the heater is more than halfway through its expected life, replacement is almost always the smarter choice. You're not just buying the repair — you're buying whatever fails next, plus another year of the anode rod slowly giving up.
Tank vs. tankless in a Marietta home
When you do replace, the big question is whether to stay with a tank or switch to tankless.
Stick with a tank if...
- The existing gas line and venting are sized for tank equipment (retrofitting can be expensive)
- You want the lowest upfront cost
- Household hot water demand is modest and steady
Consider tankless if...
- Multiple showers running back-to-back regularly run out of hot water
- You want the 15–20 year lifespan and can absorb the higher install cost
- You have space constraints — tankless units are wall-mounted and compact
- You value the energy savings from not maintaining a hot tank 24/7
Marietta code and permit notes
Cobb County requires a plumbing permit for water heater replacement, and the installation must meet current code — including expansion tanks on closed systems, T&P discharge to a safe location, sediment traps on gas lines, and proper venting on gas units. A licensed local plumber handles all of this as part of the job. A handyman-installed water heater can create insurance, warranty, and safety problems years later when you try to sell the home.
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