When it comes to commercial kitchens, you do not want to have any issues with your dishwashers. A dishwasher plays an important role in the activities of such an establishment. You cannot be expected to continue serving clients if you do not have clean dishes. You will need to get the repair services in quickly to come to fix it. It is possible they can fix it in time, or they may suggest you get another one. You only think of getting another one when you have to, since you cannot know for sure if it shall survive any longer. You, therefore, need to know how to buy the machine with the right parts in it.
You need first to avoid any washer that has plastic parts in it. The machines that come with plastic components cannot take the pressures of a commercial kitchen, no matter what the manufacturer says. They will have a hard time withstanding the high temperatures that such a commercial dishwasher is subjected to. Those are machines that do well at home, not the restaurant.
You need to buy one with stainless steel parts. Such a machine will take the constant use without its internal parts warping, melting or breaking up. There is also the issue of limescale, which shall take long to scale up. When it finally does, removing it with chemicals is an easier process.
You need to look at the country of origin of this dishwasher machine. It needs to have been built by the best manufacturers there are. Their access to high-quality stainless steel needs to be assured. This makes it easy for them to make great machines with great parts, and charge you a reasonable price for it. A simple way to go about it would be to look at the most famous brands in the market known for their stainless steel components. IT is possible to find other manufacturers that are not as well-known but who still make theirs using stainless steel. It is important that you do your research well into those.
The warranties that accompany the machines and the parts are something you also need to watch out for. When you spot a manufacturer who offers unreasonably short warranties, that is already a sign of the kind of quality you are getting. You, therefore, need to aim for those that offer long periods of warranties. You also need to find it easy getting in touch with them when there is an issue. If the supplied customer care numbers are not working properly, you cannot trust they will do a good job with your machine. You need one that shall be there for you when there is a problem.