Most water heaters don’t quit without warning. In the weeks or months before a breakdown, they usually give you signs that something’s wrong. Spotting those signs early can mean the difference between a simple repair and a flooded basement on a cold Calgary morning.
Here are the five most common signs your water heater is failing, what each one usually means, and how to decide whether to repair or replace it.
5 Signs Your Water Heater Is About to Fail
1. Not Enough Hot Water, or None at All
If showers turn cold sooner than they used to, or the water takes much longer to warm up, your water heater is struggling. Common causes include sediment taking up space inside the tank, a failing heating element or burner, or a faulty thermostat. Many of these are fixable with a hot water tank repair, especially on a younger unit.
2. Leaks or Moisture Around the Tank
Not every leak means the end. Drips from a fitting, a pipe connection or the pressure relief valve can often be repaired. But water pooling under the tank itself usually means the inside has corroded through, and a corroded tank can’t be patched. Learn more about what causes hot water tank leaks. If you see a leak, call a professional quickly, before a slow drip becomes a burst tank.
3. Rumbling, Popping or Banging Noises
A healthy water heater is close to silent. Rumbling or popping usually comes from sediment that has hardened at the bottom of the tank, where water trapped underneath boils and bursts through. Calgary’s hard water makes sediment build up faster. Flushing the tank can help if it’s caught early, and a water softener slows it down. If the noise is loud or getting worse, the tank is under strain.
4. Rusty or Discoloured Hot Water
If only your hot water looks rusty or brown, the problem is likely inside the water heater. Tanks have a sacrificial anode rod that corrodes so the tank doesn’t. Once it’s used up, the tank itself starts to rust. Replacing the anode rod early can extend a tank’s life, but rust in the water from an older tank often means it’s near the end. Avoid drinking discoloured water until it’s been checked.
5. Your Water Heater Is Over 10 Years Old
A traditional tank water heater typically lasts about 8 to 12 years, while a well-maintained tankless unit can last around 20. You can find the manufacture date on the label or in the serial number. If your tank is past the 10-year mark and showing any of the signs above, it’s time to start planning a replacement rather than waiting for it to fail.
Repair or Replace?
Repair usually makes sense when the unit is less than about 8 years old and the problem is a single part, such as a heating element, thermostat, valve or anode rod.
Replacement usually makes sense when the tank itself is leaking, the hot water is rusty, the unit is over 10 years old, or repairs are becoming frequent. A new, properly sized unit is also more efficient. Our guides to choosing the right tank size and tank vs. tankless water heaters can help you choose, and our team handles water heater installation across Calgary.
How to Make Your Water Heater Last Longer
- Flush the tank once a year to clear sediment.
- Have the anode rod checked every few years and replaced when it’s worn.
- Test the pressure relief valve to make sure it works properly.
- Consider a water softener to reduce mineral buildup from hard water.
For a full routine, see our guide on how to maintain your water heater.
Get Your Water Heater Checked
Noticed any of these signs? ProStar Plumbing & Heating has repaired and replaced water heaters across Calgary since 1996. Book a water heater inspection or call us at (403) 250-7232. We’re available 24/7.