I have 432 apartments with gas water heaters and American Water heaters are by far the worst. Although Rheem/Richmond are becoming a clear second. Contrary to what some are posting they are not much better as we have had some fail after only 2 - 3 years. The safety device inside them is a small temperture sensitive burst vial which Rheem does not consider a replaceable part if it fails they want you to return the water heater to them so they can see why. After having to pull a couple of these It's easy to see why. The screen is smaller than an American's and is only accessable from the inside of the unit which makes it hard to clean properly as all of the accumulated dirt and lint is under the screen and unreachable. To make matters worse the screen is covered in the oil they use when they stamp the screen and acts as an effective dust magnet. We have had conversations with Rheem regarding this and they think there's no problem with it. We have started cleaning the screens with solvents prior to installation to see if this will extend the life of these heaters. Only time will tell...