If your water heater stops working, it disrupts everything—showers, laundry, dishes. It’s not something you can ignore.
At Lambton Heating and Cooling, we deal with no hot water calls across Sarnia every day. Before you book a service call, there are a few things you can check to narrow down the issue.
Common Reasons Your Water Heater Isn’t Working
Most water heater problems come down to a few core issues:
1. Power or Gas Supply Problems
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Electric units may have a tripped breaker
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Gas units may have a pilot light that’s out or a gas valve issue
2. Internal Temperature Control Issues
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Electric water heaters use internal thermostats behind access panels
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Gas units use a control valve to regulate temperature
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If these components fail, the unit won’t heat properly
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3. Sediment Build-Up
Hard water in the Sarnia area leads to mineral buildup inside the tank. Over time, this reduces heating efficiency and can cause overheating, noise, or complete failure.
According to Natural Resources Canada, water heating is one of the largest energy uses in Canadian homes, and efficiency drops significantly when systems aren’t maintained.
4. Failed Heating Elements (Electric Units)
Heating elements wear out over time and stop producing heat.
5. Tank or Valve Problems
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Leaks from the tank or fittings
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Faulty pressure relief valve
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Internal corrosion or tank failure
Quick Troubleshooting Steps
Before calling a technician, check these basics:
Step 1: Check Power or Gas Supply
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Reset the breaker if it’s tripped
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Make sure the gas valve is on
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Confirm the pilot light is lit (if applicable)
Step 2: Check Temperature Settings (If Accessible)
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Ensure the temperature hasn’t been turned down
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On gas units, check the control dial
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Electric units should not be opened—leave internal components to a professional
Step 3: Look for Leaks or Damage
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Check around the base of the tank
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Inspect visible piping and connections
Step 4: Test the Hot Water
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Run hot water for several minutes
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See if it improves or stays cold
When to Call a Professional
Stop troubleshooting and call if you notice:
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No hot water at all
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Water not staying hot
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Loud popping or rumbling sounds
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Rusty or discoloured water
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Any visible leaking
These are signs of internal failure or safety concerns.
Bradford White recommends regular maintenance to ensure efficient and safe operation and to extend the life of your water heater.
Repair vs Replacement: What’s the Right Call?
Here’s the straight answer:
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Under 8 years old: Repair is usually worth it
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8–12 years old: Depends on condition and cost
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12+ years old: Replacement is typically the smarter move
If the tank itself is failing, repairs won’t last.
Why Sarnia Homeowners Choose Lambton Heating and Cooling
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Fast response times across Sarnia and Lambton County
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Experienced technicians who diagnose the issue properly
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Straight answers—repair or replace
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Full-service solutions for tank and tankless systems
If your water heater isn’t working, don’t wait until it turns into water damage.
Frequently Asked Questions
Why is my water heater not producing hot water?
Most commonly due to power issues, gas supply problems, or failed internal components.
How long should a water heater last in Ontario?
Typically 8–12 years, depending on water quality and maintenance.
Is hard water a problem in Sarnia?
Yes. Mineral buildup is a major cause of reduced efficiency and early failure.
Can I repair my water heater myself?
You can check basic external issues, but internal repairs should always be handled by a professional.
How fast can a technician fix it?
Many repairs can be completed in one visit if parts are available.
Final Take
A water heater failure is usually straightforward—but delaying action is what makes it expensive.
Check the basics. If it’s not obvious, get it handled properly by the experts at Lambton Heating and Cooling. 
If you’re in Sarnia, Lambton Heating and Cooling will get your hot water back—fast and done right.
