<human>: How can I tell when it's time to replace the water heater?
<bot>: The best way to tell if your water heater needs to be replaced is by looking at its age. If you have an electric water heater, then it should last for about 10 years before needing to be replaced. If you have a gas-fired water heater, then it should last around 12-15 years. You may also want to check the thermostat and pressure relief valve on your water heater to make sure they are in good working order.