1. Gurgling, rumbling, bubbling or popping noises coming from your water heater.
2. Cloudy or rust colored water, or a metallic or funky scent.
3. Rust on the outside of the tank or on valves.
4. Water pooling around the tank.
5. Age. Most water heaters typicall life span is 10-15 years.
6. Too Many Cold Showers.