Undermount kitchen sinks are very sturdy and much cleaner than on-top sinks for granite countertops. This is proven to be true by the fact that all of the kitchen sinks we reviewed have some sort of limited lifetime warranty, and this just goes to show that these companies stand and believe in their product. These sinks are scratch and heat-resistant (up to a certain temperature for each sink), and most are impact-resistant. While you’ll still want to be gentle anyways, it’s good knowing that pots can clang around without repercussion. Some, but not all, undermount kitchen sinks also have non-stick surfaces, and this just helps to maintain the cleanliness of the sink easier. So really, undermount kitchen sinks for granite countertops are a fantastic choice thanks to their durability.