If your water heater shows signs like inconsistent or lukewarm water, strange noises (such as popping or rumbling), leaks around the unit, or visible rust in the water, it may need repair or replacement. Age is also a key factor; if your water heater is over 10-15 years old, it’s often more cost-effective to replace it, as older units lose efficiency and may be prone to failure. A professional plumber can inspect the heater, check for sediment buildup, and assess the internal components to determine if a repair will restore it or if a replacement is the best option for reliable, efficient hot water.