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I’ve used plenty of full-size dishwashers, but the Loch Capsule was the first countertop model I’d tested, and I had my doubts. Could something only 10.3 inches wide really clean dinner plates and glassware as well as a built-in dishwasher?

The Capsule is sleek and modern, but at 18.3 inches tall, it won’t fit beneath every set of upper cabinets. I set mine on a stainless-steel rack over my sink, which worked well. It doesn’t require permanent plumbing; a separate clean-water tank feeds the dishwasher, while a hose drains the dirty water.…