Fixing a leaking water tank is one of the biggest hassles a homeowner can face. If you have stepped into your storage unit or your basement and found water around your water heater, don’t panic. Just because there is water under the water heater tank doesn’t mean that you have to replace the entire system. There are several causes for a leaky water heater tank that you can fix very easily without needing to replace the unit.
Check the temperature pressure relief valve, which releases water when too much pressure builds up in your tank. The excessive pressure can be caused by several things, including having your water temperature set too high. You can find the TPRV at the top of the unit with a pipe coming off to the side of the water heater and extending down to the base of the unit. If water is leaking from the TPRV, consult your owner's manual as to how to adjust. Also make sure that the TPRV is secured properly.
Check the drain valve. The drain valve is located on the lower section of the water heater with a spigot coming off of it. The drain valve is used to flush the system. If the drain valve is not tight, water could be coming out of it.
Check the water pipes going into the water heater. If water is running down the pipes and then coming off of your water heater, you can fix this by tightening the fitting on the pipe with a pipe wrench. If this doesn't work, you may have to replace the fitting.
Look over the water heater tank. Older water heaters can become corroded on the inside and could be leaking water. If you find water coming out of the tank itself, you will need to replace the whole unit.