Notice a puddle around your water heater? Maybe it’s just a drip, maybe it’s more. Either way, you’re probably asking yourself: is a leaking water heater dangerous?
The short answer: yes, it can be.
Even a small leak can quickly escalate into something more serious—think water damage, mold, fire hazards, or even pressure-related explosions in rare cases. In this blog, we’ll explain why water heater leaks matter, what to look for, and when to call in a professional.
Why a Leaking Water Heater Is a Problem
First off, any leak, no matter how small, means something isn’t working the way it should. And when you’re dealing with hot water, gas, or electricity, even a minor issue can turn risky fast.
Here’s what a leaking water heater could lead to:
- Water damage to floors, walls, and anything nearby
- Mould and mildew (which spread fast in damp areas)
- Electrical risks, especially if your unit is near outlets or wiring
- Gas leaks or fire hazards with gas-powered heaters
- In rare cases, pressure buildup and tank rupture
If you’ve noticed signs like that, don’t wait.
🔧 We offer quick water heater repairs in Mississauga and the rest of the GTA
Warning Signs to Watch For
Not sure if your water heater is in trouble? Here are some things to keep an eye out for:
- Water is collecting around the base
- Rust or corrosion on the tank
- Drips from the pressure relief valve
- Noisy operation—popping, rumbling, or banging
- Discoloured or rusty hot water
- Burnt smells or scorch marks (especially for gas heaters)
🛠️ If you’re seeing any of these signs, get it checked right away
What If My Water Heater’s in the Basement?
If your water heater’s tucked away in a finished basement, it’s even more important to act fast. A slow leak can do serious damage to:
- Flooring and drywall
- Furniture and electronics
- Electrical panels
- Your home’s insulation and structure
We’ve seen homeowners lose thousands because they didn’t notice a leak until it was too late.
What To Do If Your Water Heater’s Leaking
Caught a leak early? Here’s what to do:
- Turn off the water supply to the heater
- Shut off the power or gas (whichever your unit runs on)
- Don’t touch the tank if you’re unsure—it can be dangerous
- Call in a licensed technician to take a proper look
☑️ Need fast help? We’ve got local techs ready 24/7
Can a Leaking Water Heater Explode?
We’re not trying to scare you, but yes, in rare cases, it can happen. If the temperature and pressure relief valve (also called a T&P valve) fails and pressure builds up, the tank could rupture or burst. It’s not common, but it’s why every leak should be taken seriously.
🧯 Stay safe—book an inspection with HVAC Group
Should You Repair or Replace It?
Not every leak means you need a brand-new water heater. But here’s when it’s time to think replacement:
- Your unit’s more than 10–15 years old
- The leak is coming from the tank itself
- You’ve had multiple repairs already
- There’s visible rust or corrosion on the tank
💧 We can help with full water heater replacements too
Related Services That Might Help
- Water Heater Maintenance
- Water Heater Installation
- Tankless Repairs & Servicing
- Gas Leak Repair
- Emergency Plumbing Services
Final Word
So, is a leaking water heater dangerous?
Yes—and not just because of water on the floor. A leak is a warning sign that something’s not right, and delaying action could risk flooding, fire, or total system failure.
Whether you need a simple fix, an emergency repair, or a full system replacement, HVAC Group has you covered in Mississauga and across the GTA.