Can a Water Heater Explode?

Edited: October 29, 2025

Yes, it’s possible for a water heater to explode, but it doesn’t happen often, and rarely has it killed anyone. Explosions usually occur when pressure builds up inside the tank due to a broken relief valve, overheating, or a lot of sediment buildup. If your water heater is making strange noises, leaking, or has rust at the bottom, it might be warning you of dangerous pressure buildup.

In this guide, we’ll cover the reasons a water heater might explode, what to do if it happens, and how you can prevent such a catastrophic event. Understanding the potential hazards is crucial for maintaining a safe home environment. We’ll explore common causes, such as excessive pressure

What Causes Water Heaters to Explode?

There are several issues that can compromise the efficiency and safety of a water heater. Understanding these potential problems is crucial of for ensuring optimal performance and longevity. Here are some key factors to consider:

• Malfunctioning pressure relief valve can cause excessive pressure within the tank.
• Overheating and increased pressure can result from sediment accumulation at the bottom of the tank.
• Lack of maintenance can lead to corrosion, weakening the tank or its components.
• Incorrect installation or design flaws can undermine the water heater

But Do Water Heaters Explode?

While rare, water heater explosions can occur in any home or business when systems are not properly maintained. Older water heaters are more prone to issues due to years of sediment accumulation and corrosion. Neglecting regular maintenance and inspections increases the risk of explosions. Done! technicians have seen the aftermath of water heater explosions in homes across Denver. It just highlights the importance of proper care and attention. Regular maintenance not only prevents potential disasters but also extends the lifespan of the unit. By ensuring that pressure relief valves function correctly and regularly flushing the tank to remove sediment, homeowners can greatly reduce the chances of catastrophic failure.

Can Tankless Water Heaters Explode?

Tankless water heaters, though generally safer than traditional ones, can explode if not properly installed or maintained. Risks include inadequate venting, incorrect gas line sizing, and mineral buildup clogging the heat exchanger, leading to high pressure. Regular maintenance by a licensed Denver plumber is essential for safety.

Additionally, consulting our professionals for periodic water heater maintenance checks can provide peace of mind and safeguard property. Learn how regular maintenance prevents failures.

Danger Signs Your Water Heater is Going to Explode

Be aware of these warning signs that indicate your water heater may be at risk of exploding:

• Popping, knocking, or rumbling sounds coming from the tank indicate sediment buildup
• Leaks around the base of the tank or connections signal corrosion or damage
• Inconsistent water temperatures or reduced hot water supply may point to a failing heating element
• A strong rotten egg smell near the tank could mean a gas leak, requiring immediate attention

What to Do if Your Water Heater Bursts

If your water heater bursts, treat it as an emergency. Here’s what to do right away:

• Turn off power and water. Shut off the circuit breaker (for electric units) or gas supply (for gas units), then close the cold-water valve feeding the tank.
• Avoid standing water. The area around a burst tank can be electrically charged or dangerously hot. Evacuate the home, if possible.
• Check for gas smells and hissing. Call 911 if you smell gas or hearing hissing sounds.
• Call our emergency plumbers immediately. You’ll need professional help to stop water damage and assess if the tank can be replaced or repaired.
• Document the damage. Take photos for insurance before cleanup.

A burst water heater often indicates long-term corrosion or pressure buildup—signs that maintenance could have prevented. 

Annual Maintenance Can Prevent Water Heater Explosion

To keep your water heater functioning safely and efficiently, follow these preventive measures:

• Schedule annual water heater inspections and maintenance with Done
• Flush the tank every 6-12 months to remove sediment and prevent corrosion
• Install a pressure-reducing valve to regulate incoming water pressure
• Replace aging water heaters before they become a safety hazard
• Trust only licensed and experienced plumbers in Aurora for installation and repairs

Done Helps Denver Residents Maintain Safe Water Heaters

At Done, we are committed to helping Aurora residents maintain safe and reliable water heaters through:

• Comprehensive water heater maintenance plans tailored to your Aurora home’s needs
• Experienced technicians trained to identify and address potential safety issues
• 24/7 emergency service for water heater repairs and replacements in Aurora
• High-quality tankless and traditional water heater installations that prioritize safety
• Honest, upfront pricing and exceptional customer service for Aurora residents

Don’t wait until it’s too late. Contact Done today to schedule your water heater inspection and ensure the safety of your Aurora home. Our team of skilled plumbers is ready to provide the expertise and care your water heater needs. Remember, One Call… It’s Done!