I have a 40 gallon hot water heater that is 6 years old and it does not put out enough hot water; it has steadily gotten worse. I can only fill one tub of water at a time. We are getting the right amount of GAS to it. I need help knowing what to check or what the problem may be. Thanks

Look at the dip tube to see if it is broken off.

How a water heater dip tube works and what it looks like. (http://www.masterplumber.net/electricwh/dip_tube.htm)

www.diptube.info - Another great official website from Michael Leavitt & Co Inspections, Inc. (http://www.diptube.info/)