Online reviews of a Whirlpool dishwasher or any other appliance can be posted on sites such as Amazon, ConsumerAffairs and ResellerRatings, as of 2015. Customers may also be able to post reviews on the website of the business from which they bought the Whirlpool dishwasher.
Amazon allows anyone with a customer account to review any products, including dishwashers, that Amazon has listed. The customer does not necessarily have to have purchased the item through Amazon, but some extra credence is given to reviews of products bought through that specific Amazon account with an "Amazon Verified Purchase" tag.
ConsumerAffairs allows users to review both manufacturers and individual products. No verification of product purchase is required. ResellerRatings focuses on reviews of the manufacturer, but the performance of individual products is germane and can be included in a review.
It may also be possible to review the product at the website of the retailer at which it was purchased. This is more likely if it is a major retail chain such as Wal-Mart, Sam's Club, Sears, h.h. gregg and The Home Depot. The review policies of the companies differ, and they may or may not require proof of purchase of the item for customers to leave a review.