Red water from a hot water heater typically indicates rust or corrosion in the tank or pipes, requiring inspection and possible flushing or replacement.
Seeing red or rusty water from your hot water heater can be alarming. This common issue often signals corrosion or sediment buildup in your system. Understanding the causes helps you take the right action to restore clean water.
Why Is My Hot Water Red?
Red or brown water from your hot water tap typically comes from one of these sources:
1. Corroded Water Heater Tank
The most common cause is internal tank corrosion. Water heaters contain a steel tank lined with glass or other protective coating. Over time, this lining wears down, exposing the metal to water. Rust forms and mixes with your hot water supply.
Signs of tank corrosion:
- Rusty water only from hot taps
- Visible rust on tank exterior
- Leaks around the tank base
2. Sediment Buildup
Minerals in water settle at the tank bottom, forming sediment. This can discolor water when disturbed. Regular maintenance prevents severe buildup.
3. Failing Anode Rod
The anode rod attracts corrosive elements to protect your tank. When it wears out (typically every 3-5 years), corrosion accelerates. Replacing it can extend your heater’s life.
4. Pipe Corrosion
If rusty water comes from both hot and cold taps, the issue may be in your pipes rather than the heater. Galvanized steel pipes are especially prone to rusting.
Is Rusty Water Dangerous?
The EPA considers slightly rusty water safe for most uses. However, it can:
- Stain clothes and fixtures
- Affect water taste
- Dry out skin and hair
For drinking water, consider using a filter until the issue is resolved.
How to Fix Red Water Issues
For Minor Sediment Problems
- Turn off power to the heater
- Connect a hose to the drain valve
- Open the valve and let water flow until clear
- Refill the tank before restoring power
For Corrosion Issues
If flushing doesn’t help, you likely need:
- Anode rod replacement ($150-$300)
- Complete water heater replacement ($800-$2,500)
According to plumbing experts, exterior tank rust usually means the internal lining has failed, requiring replacement.
Preventing Future Problems
Extend your water heater’s life with these tips:
| Maintenance Task | Frequency | Benefit |
|---|---|---|
| Flush the tank | Annually | Removes sediment |
| Check anode rod | Every 3 years | Prevents corrosion |
| Inspect for leaks | Monthly | Early problem detection |
Consider installing a water filtration system if you have hard water to reduce sediment accumulation.
When to Call a Professional
Contact a plumber if you notice:
- Persistent red water after flushing
- Visible tank leaks
- Rusty water from all taps
- Decreased water pressure
Early intervention can prevent more costly repairs. For complex systems like HVAC integrated water heaters, professional service is especially important.
