About Cosmo
Cosmo Appliances is headquartered in Chino, California, and builds its lineup around a straightforward idea: serious cooking equipment shouldn't require a luxury budget to reach it. The company positions itself in the mid-tier of the kitchen appliance market, above entry-level big-box lines but below the ultra-premium brands, and sells across ranges, cooktops, wall ovens, range hoods, refrigerators, wine coolers, microwave drawers, and dishwashers. Rather than manufacturing every component in-house, Cosmo sources deliberately, including Italian-made burners on several of its gas ranges and cooktops and a Turbo True European convection system paired with ARC-FLOW permanent stainless steel filters on its range hoods.
The dishwasher we've tested, the COS-DIS6502, comes from Cosmo's Lumin Collection, one of more than a dozen named design lines the brand uses to keep a kitchen's cooking, ventilation, and cleanup appliances visually consistent. It's a full-size 24-inch built-in with a stainless steel tall tub and three full racks, a configuration that's genuinely uncommon at its price point, and the listing has held a public review history since 2022 rather than arriving as a freshly launched SKU with a thin, unproven rating.
Brand website: cosmoappliances.com
What Cosmo makes
Cosmo's range runs wider than the products we review. The lines we know best from our own testing are marked with a star:
Ranges & cooktops
gas, electric, dual-fuel, and induction models, several with Italian-made burners
Range hoods
wall-mount, under-cabinet, island, and insert hoods with Turbo True European convection
Dishwashers
24-inch full-size built-ins, including the three-rack Lumin Collection unit featured on DIYRated — featured on DIYRated
Refrigerators
French door refrigerators in the COS-FDR series, plus wine coolers
Wall ovens & microwaves
built-in wall ovens, microwave drawers, and over-the-range microwaves
Studio Collection
24-inch compact appliances sized for apartments and smaller kitchens
Why we recognized Cosmo
The DIYRated Top Brand recognition isn't paid for and can't be applied for. We award it to the brands whose products consistently stand out in our hands-on category reviews. Cosmo earned it on the strength of the products below, evaluated the same way every product on this site is: bought, put to work on real jobs, and judged on merit.
Cosmo products we rated highly
Cosmo Lumin COS-DIS6502 24-Inch Dishwasher
Sixteen place settings across three full racks is the largest capacity we found in its price band, paired with a stainless steel tall tub and a heated dry element that gets plastic containers dry without a separate cycle. It carries 61 verified reviews, roughly ten times the review depth of comparable machines we tested at the same price, and the listing has been live since 2022 rather than being a newly launched SKU.
Read the 7 Best Dishwasher Brands of 2026 guide →What earned Cosmo the recognition
- One of only two machines in our dishwasher-brands roundup with a genuine third rack, and the only one that pairs three racks with sixteen place settings, the largest capacity we tested at its price.
- 61 verified reviews on the featured Lumin Collection dishwasher is the deepest owner record of any full-size 24-inch machine we reviewed in its price band, with a listing history stretching back to 2022.
- A stainless steel tall tub combined with a heated dry element, giving it the drying performance that condensation-drying competitors in the same roundup can't match on plastics.
- Positions its full catalog, ranges, cooktops, hoods, refrigerators, and dishwashers, as coordinated design collections, so a kitchen's appliances can share a consistent look rather than being sourced piecemeal.
- Sources deliberately rather than generically, including Italian-made burners on its gas ranges and cooktops and a Turbo True European convection system on its range hoods.