Signs Your Water Heater May Need Replacing
The first sign that your water heater is not working properly might be when you notice low hot-water pressure. You can check this by filling a pot with various containers and checking how long it takes for them all to run dry or get warm, then comparing those times against each other while also accounting for different types of usage (e example: letting someone else use the same amount as me). If there isn't enough energy being put out by an old unit—a possible indication something has failed internally--you'll see identical lengths despite differences in demand;
Your Water Heater is Old
If your water heater is acting strangely and it’s over 10 years old, it could be time to consider replacing your unit. While some hot water heaters made today can last even longer, many units start to deteriorate after about a decade.