Water Heater Repair or Replacement: How to Decide
Common water heater problems, which ones can be repaired, signs it's time to replace and how to choose a new one.
In this guide
Key takeaways
- The US Department of Energy says most storage water heaters last 10 to 15 years.
- Problems like no hot water or noise can often be repaired. A leaking tank usually can't.
- Age, repair cost and efficiency all factor into the decision.
- Planning a replacement before the old one fails gives you time to compare options.
Introduction
When your water heater starts acting up, the first question is whether to repair it or replace it. A repair might cost a fraction of a new unit, but putting money into an old water heater that fails soon after can be frustrating.
This guide covers common problems, the signs that point to replacement and how to choose your next water heater.
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How long water heaters last
The US Department of Energy says most storage water heaters last 10 to 15 years, while tankless water heaters can last more than 20 years. Hard water, heavy use and lack of maintenance can shorten that.
You can usually find the manufacture date on the label on the side of the tank, sometimes coded into the serial number. The manufacturer's website often explains how to read it.
Common problems that can often be repaired
| Problem | Common cause | Typical fix |
|---|---|---|
| No hot water (gas) | Pilot light out, faulty thermocouple or gas valve | Relight pilot or replace part |
| No hot water (electric) | Tripped breaker, failed heating element or thermostat | Reset breaker or replace part |
| Not enough hot water | Sediment build-up, a failed element or thermostat setting | Flush tank, replace part or adjust setting |
| Popping or rumbling noise | Sediment at the bottom of the tank | Flush the tank |
| Rotten egg smell | Reaction with the anode rod | Replace the anode rod |
| Leak from a valve or fitting | Loose fitting or faulty relief valve | Tighten or replace the part |
Work on gas water heaters, and any electrical work beyond resetting a breaker, is usually safer to leave to a licensed plumber or technician.
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Not now, show me another guide →Signs it's time to replace
- The tank itself is leaking. Water pooling under the heater from the tank, not a fitting, usually means the tank has corroded through. Tanks can't be repaired.
- Rusty hot water that doesn't clear, which can mean the inside of the tank is corroding.
- The heater is near or past its expected life and needs a costly repair.
- Repeated repairs over a short time.
- Your household has outgrown it, and you regularly run out of hot water.
A simple way to decide
Many homeowners weigh three things:
- Age: how close is the heater to the end of its expected life?
- Repair cost: how does the quote compare with the cost of a new water heater?
- Efficiency: would a new, more efficient model meaningfully lower your energy bills?
A small, inexpensive repair on a younger heater is usually worth doing. A costly repair on a heater near the end of its life often isn't.
The Department of Energy notes that water heaters typically last about 10 to 15 years, so if yours is getting close to that age, it's worth starting your research now. Replacing it before it fails gives you time to compare options rather than buying in a rush, and can help you avoid water damage from a sudden leak.
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Types of replacement water heaters
- Storage tank (gas or electric): the most common type. A tank keeps water hot and ready.
- Tankless (on-demand): heats water only when you need it. Usually lasts longer, but installation can cost more, especially if gas lines or venting need upgrading.
- Heat pump water heater: an electric model that moves heat from the surrounding air into the water. It uses much less electricity than a standard electric tank but needs space and works most efficiently in a room that doesn't get too cold.
Look for the ENERGY STAR label and check the yellow EnergyGuide label, which estimates yearly running cost.
Choosing the right size
For storage water heaters, look at the first-hour rating on the label. It shows how much hot water the heater can deliver in an hour of busy use. For tankless models, look at the flow rate in gallons per minute at the temperature rise you need. A plumber can help you size it for your household.
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Simple maintenance to extend its life
- Flush the tank once a year to remove sediment, following the manufacturer's instructions.
- Test the temperature and pressure relief valve as the manual recommends.
- Have the anode rod checked every few years, and replaced if it's worn.
- Keep the area around the heater clear, and check regularly for drips or rust.
Safety warning signs
- A gas smell near the water heater: leave the house and call your gas company from outside.
- Water leaking from the relief valve, which can mean pressure or temperature is too high.
- Scorch marks around a gas burner, or a yellow, flickering flame instead of a steady blue one.
These need a professional promptly, whether you plan to repair or replace.
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Conclusion
Many water heater problems, such as a pilot light, heating element or sediment, can be fixed. A leaking tank, persistent rust or an old unit needing a costly repair usually points to replacement. Weigh the age, repair cost and efficiency, and if your heater is getting close to 10 years old, start planning before it fails.
Common questions
How do I know how old my water heater is?
Check the label on the tank. The manufacture date is often listed, or coded into the serial number. The manufacturer's website usually explains the code.
Can a leaking water heater be repaired?
Leaks from valves or fittings can often be fixed. A leak from the tank itself usually means the heater needs replacing.
Do I need a permit to replace a water heater?
Many areas require a permit, especially for gas water heaters. Ask your plumber and check with your local building department.
Sources and further reading
This guide is general information. Licensing and permit rules vary by state and city, so check the rules where you live.
