Check the serial number. The first letter is the month of manufacture and the next two digits are the year. If it is older than G94, it is out of warranty. If it is newer, just check your yellow pages for water heater service and call one of the State dealers.: I have a State Wter heater and it has started to leak. I am trying tio find the headquarters number for STATE Water Heaters so I can ask them about the warranty. The heater is only 5 years old and I am a annoyed that just after 5 years it is leaking. I purchased the house new so I am the original owner.: If you havbe the warranty division Number, that would be great…: thanks