Most of the waterfall fountains come with a warranty. So you can determine the longevity of the product based on that. However, note that these fountains easily last for a year or more without needing any further additions or repairs at least. You will find that many people will urge you to buy expensive waterfalls because they think that they will last longer. But there isn't any reliable proof of that. So if you want a fountain that lasts longer, just get one with a longer warranty.