Few things disrupt your day faster than realizing your hot water heater not working when you turn on the shower or kitchen faucet. Whether you suddenly have only cold water or the water never reaches the right water temperature, a water heater failure can affect everything from showers to washing dishes.
Many homeowners assume the entire water heater needs replacement right away, but that is not always the case. Some problems are simple fixes, such as thermostat settings or a tripped circuit breaker. Others may require professional repair or replacement.
At G.A. Eberly Plumbing & Heating, we have helped homeowners throughout Falls Church and the DMV region keep their water heaters working properly for more than 115 years. As a family-owned, woman-operated company founded in 1909, we combine long-standing expertise with modern tools to diagnose and solve plumbing problems quickly and safely.
If your hot water heater is not working, the list below explains the most common causes and what they may mean for your home.
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11 Reasons a Hot Water Heater Is Not Working
1. Power Supply Issues
For homes with electric water heaters, one of the most common causes of a heater not working is a power interruption.
A tripped circuit breaker in the home’s electrical panel may stop the heater from operating. Resetting a tripped breaker or replacing a blown fuse may restore power to the system.
2. Pilot Light Is Out
Homes with gas water heaters rely on a pilot light to ignite the burner that heats the water.
If the pilot light goes out, the heater cannot begin heating water. A bad pilot light, a faulty gas valve, or restricted gas flow may cause this issue.
3. Thermostat Failure
Incorrect thermostat settings or a faulty thermostat can prevent the water heater from reaching the desired temperature.
Many systems include an upper thermostat that controls when the heating cycle begins. If this component fails, the system may produce only lukewarm water or none at all.
4. Failed Heating Element
In electric models, the heating element inside the tank warms the water.
A failed heating element or faulty heating elements may prevent the system from producing hot water. This is one of the most common water heater problems in electric heaters.
5. Sediment Buildup in the Tank
Over time, minerals settle at the bottom of the water heater tank, creating sediment buildup.
This buildup can prevent efficient heating and create strange noises while the unit is operating. If the buildup becomes severe, it may affect the heater’s ability to heat water.
Regular maintenance can help prevent sediment buildup and extend the lifespan of the heater.
6. Gas Supply Problems
Homes with gas heaters depend on a steady gas supply. If the gas line is restricted or the gas control valve is malfunctioning, the burner may not ignite.
In some situations, a faulty gas connection or interruption in the gas flow may prevent the heater from operating.
If you suspect a gas leak, contact your gas company immediately and avoid attempting repairs yourself.
7. Faulty Pressure Relief Valve
The pressure relief valve is an important safety device designed to release excess pressure from the water heater tank.
If the valve malfunctions, it may cause excessive pressure buildup inside the tank. In some cases, this can lead to leaks or operational issues.
8. Leaking Water Heater Tank
A leaking water heater or water heater leak may indicate serious internal damage.
Leaks may develop due to tank corrosion, worn components, or loose fittings, such as a loose drain valve or loose inlet connection.
If you notice water leaks near the bottom of the tank, the entire water heater may need replacement.
9. Aging Water Heater
The average water heater lasts between 8 and 12 years, depending on maintenance and water quality.
Older units may develop internal corrosion, worn parts, and declining performance. In some cases, replacement may make more financial sense than continued repairs.
10. Improper Heater Size
If a home frequently runs out of hot water during showers or heavy use, the heater may be too small for the household.
An undersized unit may struggle to produce enough hot water for daily activities such as hot showers, laundry, and dishwashing.
11. Venting or Installation Problems
Improper installation or ventilation can affect both gas models and electric systems.
Blocked vents, incorrect installation, or plumbing issues can prevent the heater from functioning properly and maintaining a constant temperature.
What Homeowners Can Check Safely
Before calling a plumber, homeowners can perform a few basic checks.
Start by confirming that the unit has power. Check the home’s electrical panel for a tripped circuit breaker or blown fuse if you have an electric heater.
Next, inspect the thermostat settings to ensure the water temperature is set correctly.
If your system allows access, you may also remove the access panel to check indicator lights on certain models.
Look around the water heater tank for signs of water leaks, rust, or unusual, strange sounds while the system is operating.
Always follow essential safety precautions before working near a water heater. If the issue involves gas lines, pressure valves, or electrical components, it is safest to contact a professional.
When Repair vs Replacement Makes Sense
Not every water heater problem requires replacing the unit. In many cases, replacing small components such as a thermostat, heating element, or valve can restore normal operation.
However, replacement may be recommended if
- The heater is more than 10 years old
- The water heater tank is leaking
- Frequent repairs are required
- Corrosion or mineral buildup is severe
- Energy efficiency has declined significantly
A professional plumber can inspect the system and recommend the most practical solution based on the unit’s age and condition.
At G.A. Eberly Plumbing & Heating, our experienced technicians diagnose water heater problems quickly and provide reliable repair or replacement options. Every installation and repair is supervised by a Master Technician to ensure dependable performance.
Schedule Your Service Today
Is your hot water heater not working in Falls Church, VA? Our team is ready to help restore comfort to your home.
We provide expert water heater repair, maintenance, and installation services throughout the DMV region.
Schedule your service today and put more than 115 years of plumbing expertise to work for you.
Your trusted local plumber serving Maryland, Virginia, and Washington, D.C. since 1909.
Helpful Links and Resources for Troubleshooting Your Hot Water Heater
- Energy.gov – Water Heating Basics: Learn about the basics of water heating systems, energy efficiency tips, and common issues with water heaters. Visit Energy.gov
- Family Handyman – Water Heater Troubleshooting Guide: A step-by-step guide to diagnosing and fixing common water heater problems. Visit Family Handyman
- This Old House – How to Maintain a Water Heater: Expert advice on maintaining your water heater to prevent future issues. Visit This Old House
- Consumer Reports – Water Heater Buying Guide: If your water heater is beyond repair, this guide helps you choose a new one that fits your needs. Visit Consumer Reports
- Home Depot – Water Heater FAQs: A comprehensive FAQ section covering common water heater questions and troubleshooting tips. Visit Home Depot
- Bob Vila – Common Water Heater Problems: Insights into common water heater issues and how to address them effectively. Visit Bob Vila
- Angi – When to Call a Professional for Water Heater Repairs: Understand when it’s time to call in a professional for help with your water heater. Visit Angi