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Universal Air Systems

How-to · 5 minutes · easy

How to Know Your Water Heater Is About to Fail

When a water heater fails, it usually doesn't trickle — it bursts. A 50-USG tank dumping all at once into your basement is a six-figure insurance claim. Catch the warnings.

What you'll need

  • Flashlight
  • Wrench

Steps

  1. 1

    Check the age

    Find the data plate. If install date isn't shown, decode the serial number (most use 'YYWW' format). Tank lifespan: 8–12 years gas, 10–15 years electric. Past 10, start watching closely.

  2. 2

    Look for rust at the base

    Walk around the tank. Any rust streaks below the burner door, around the drain valve, or pooling water = pinhole leak forming. Replace.

  3. 3

    Listen for popping or banging

    Sediment built up on the tank bottom overheats and pops. Sound is loud, repetitive, alarming. Sometimes flushing the tank delays the inevitable; usually it's terminal.

  4. 4

    Run hot water from a tap

    Note the colour. Rusty or brown water = tank lining failing. White/cloudy = sediment or magnesium-anode degradation. Either way, getting close to end of life.

  5. 5

    Check the relief valve

    T&P valve dripping = pressure or temperature too high, OR the valve itself is failing. Either is fixable, but ignored T&P issues end with a burst tank.

  6. 6

    Inspect the anode rod (advanced)

    If you're handy, the anode rod can be inspected. Rod fully consumed = tank lining is now corroding. Replace the anode (extends life) or replace the tank.

  7. 7

    Check warranty period

    Most tanks have a 6, 9, or 12-year tank warranty. If you're past warranty + symptoms above, replacement is the move.

  8. 8

    Act on combinations of signs

    Any single sign = monitor. Two or more = book a quote on replacement. Tank already 12+ years = replace proactively.

When to stop and call

Visible water around the tank, rust at the base, or banging that's been getting louder — call today. Tank replacement is fast (4–6 hours including drain time). (416) 258-2460.

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Mississauga, ON · Greater Toronto Area and up to 2 hours out — London, Kitchener, Barrie, Kingston, Niagara.

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