How do I know if my water heater needs replacing?

Your water heater likely needs replacing if it's more than 10-12 years old, which you can check by decoding the serial number on the label. Other clear signs include rusty or discolored water coming from hot taps, a rumbling or popping noise from sediment buildup, visible corrosion or rust on the tank itself, or water pooling around the base indicating a leak. Frequent repairs are also a red flag. If you notice lukewarm water or inconsistent heating, it could mean the heating element is failing, which is sometimes repairable. But if the tank is old and showing multiple symptoms, replacement is usually more cost-effective than continued repairs. A plumber can give you a definitive assessment.