Look for these warning signs: Age: An ageing tank water heater (over 9 – 12 years) is often an accident waiting to happen, especially when it’s installed in an area of your home that is vulnerable to water damage. Look into a replacement. Strange noises: Sounds of banging or cracking are often caused by sediment deposits in the tank. Excess sediment buildup might signal the need for a new water heater. Lukewarm or cold water: A hot water heater’s job is simple - heating water. When a heater just doesn’t perform as well as it used to, it may be due for replacement. Rust: Rust on your appliance’s exterior tends to be obvious. Discoloured or metallic-tasting water can be a good clue that the tank is corroding on the inside. A rusted hot water tank is too far gone to repair. Leakage: Leaking from your hot water tank almost always signals that you need a replacement.