If water is only getting warm, it may be that your water heater is set too low or there could be a water leak. To check the water heater, make sure your water heater is set to 120 degrees Fahrenheit or in some cases may even require 140 degrees Fahrenheit. If the water temperature is correct, water heater repair may be necessary. If you suspect there is a water leak, water leak detection can help find the source of the issue.