A seller disclosure form can give you an idea of potential problems, but it should never be considered a substitute for a professional home inspection. Sellers may overlook problems, and often not be aware of them. It's smart to use the disclosure as starting point, but hire a pro to get the whole story.
When shopping for a dishwasher, look for features that will reduce water use, such as booster heaters and smart controls. Ask how many gallons of water the dishwasher uses during different cycles. Dishwashers that use the least amount of water will cost the least to operate.