A water heater serves as a lifeline for your household. Whether you are washing dishes, running laundry, or taking a much-needed shower, you rely on it to provide hot water for everyday tasks.
Here at Cardinal Plumbing, we know how stressful water heater issues can be. Whether you have an electric or gas water heater, problems are bound to arise. Let’s talk about some common water heater problems and what you can do about them.
If you need water heater repair in Northern Virginia, we’ve got you covered. From same-day service to emergency repairs, here’s how we can help you get back to hot water in no time!
1. No Hot Water?
If there’s no hot water available, the issue could vary depending on whether you have a gas or electric water heater.
Gas Heater:
- Pilot light out: You won’t get hot water if the light goes out. It’s usually an easy fix, just relight the pilot.
- Thermocouple/Control valve failure: If the pilot light is on but there’s still no hot water, it could be a thermocouple or pilot control valve problem. These components are indispensable and require professional repair.
Electric Heater:
- Heating element failure: If the unit is not heating the water, the heating element could be burned out. An experienced plumber can replace it quickly.
2. Not Enough Hot Water
Running out of hot water too soon is a disappointment. If your water heater is not keeping up with the demand, a few things could be at play.
Possible Causes:
- Thermostat malfunction
- Tank size
3. A Leaking Water Heater
A leaking water heater is a rather serious issue, whether it’s a slow drip or a full-blown flood. Leaks can lead to extensive water damage if not addressed immediately.
Frequent Causes:
- Rust & corrosion
- Excessive pressure
- Broken drain valve
What to Do:
Leaks from the tank usually mean it’s time for a replacement. For minor leaks, a plumber can inspect and fix the issue, but tank ruptures can cause significant damage. For cases like this, it is better to have an immediate fix.
4. Dirty or Rust-Colored Water
If your water looks dirty or rust-colored, it could indicate a problem with your water heater.
Causes:
- Rust due to corrosion
- Sediment buildup
What You Can Do:
- Tank flush: Flushing the tank can clear out sediment. But if the issue persists, replacing the anode rod or the entire tank may be necessary.
5. Water Too Hot or Too Cold
When the water temperature is all over the place – too hot or too cold – it’s time to troubleshoot.
What to Check:
- Thermostat setting
- Sediment buildup
- Defective thermostat or heating element
6. Noisy Water Heater
Hearing popping, banging, or hissing sounds from your water heater could be a sign that your tank has accumulated sediment or that something’s not working quite right.
What’s Happening:
- Sediment buildup
- Overheating
What You Can Do:
- Draining the tank is a good first step to clean it out.
- If the sounds don’t go away, your heating element may need replacement.
Contact Cardinal Plumbing for Fast Water Heater Repair
Call Cardinal Plumbing for fast and efficient water heater repair.
We offer same-day service for emergency water heater repair and replacements in Northern Virginia, including Alexandria, Sterling, and Gainesville. Our team is here to make sure you never have to worry about cold showers again.
Call us at 703-721-8888 today to schedule a service!
Check Out Water Heater Regulations
If you are thinking of upgrading your water heater, make sure you are aware of the latest regulations for water heaters. Follow this link to learn about the three major regulations for water heater installations.
Frequently Asked Questions
My water heater produces hot water in the morning but runs out much faster than it used to. Is that a repair or a sign the unit needs to be replaced?
Running out of hot water faster than before often points to sediment buildup at the bottom of the tank, which reduces usable capacity and makes heating less efficient. A professional flush can sometimes restore normal performance if the unit is in otherwise good condition. If the water heater is over 10 years old or the sediment is very heavy, a technician may recommend replacement — newer models are significantly more energy efficient and the savings add up over time.
My hot water smells like rotten eggs. What causes that, and should I be worried?
The sulfur smell comes from hydrogen sulfide gas produced when certain bacteria react with the magnesium anode rod inside the tank. It is more common in homes with well water or water with higher sulfate content. The typical fix is replacing the magnesium anode with an aluminum or zinc-aluminum rod, which does not produce the same reaction. The smell is unpleasant but not a health risk at typical household concentrations — a plumber can confirm the source and make the swap.
My pressure relief valve is dripping occasionally. Can I ignore it for now?
A dripping T&P valve should not be ignored. It either means the valve itself is failing — and may not seal properly in a real overpressure event — or that your water pressure or temperature is consistently high enough to trigger it. The T&P valve is your water heater’s primary safety device, so a malfunctioning one needs prompt attention. A plumber can test both the valve and your system pressure to identify the right fix.
I am getting rust-colored water only when I run the hot side. Should I drain the tank myself or call a plumber?
Rusty water specifically on the hot side points to corrosion inside the water heater rather than in your supply pipes. This is often a sign the sacrificial anode rod has depleted and the tank lining is beginning to rust. Draining and flushing the tank may temporarily improve the water color, but if the anode is gone and the tank is actively rusting, replacement is usually the right next step. A plumber can inspect the anode and tank condition before you commit to a path.
What can I do each year to extend the life of my water heater and reduce repair calls?
Flushing sediment from the drain valve once a year is the most impactful maintenance step for most homeowners. It protects the heating element or burner from overheating and keeps the tank from developing hot spots. Checking the anode rod every two to three years and replacing it before it is fully depleted is the second most important step — it is what prevents the tank itself from rusting from the inside out.
My water heater is 11 years old and just needed a repair. How do I decide whether to repair it again next time or replace it?
A rough guideline: if a repair costs more than roughly half the price of a comparable new unit and the water heater is over 10 years old, replacement usually makes more financial sense. Older units also lose efficiency gradually, so a newer model often pays back part of its cost through lower energy bills. Ask your plumber for an honest assessment of the tank condition — specifically the anode status and whether there are any rust spots — before committing to another repair on an aging unit.
Last Updated: 04/26/2026
