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An 18-inch built-in dishwasher can make sense in a compact kitchen, but the label alone does not tell you whether it will fit your cabinets—or whether its capacity and operating costs suit your household. Start by checking the exact model’s installation sheet and separating fixed built-ins from portable machines. The examples below illustrate what manufacturers publish; they do not establish a current best-performing model or a price winner.
What “under-counter” means—and what it does not
For a small kitchen, the relevant built-in category is often an 18-inch dishwasher. Bosch describes its 18-inch compact models as built-in and designed for flush installation (Bosch 18-inch dishwashers). “18-inch” is a nominal category description, not a promise that every machine has the same outside dimensions or will fit every opening.
A portable compact dishwasher is a different choice. It is not fixed beneath a counter: for example, Danby describes the DDW1805EWP as an 18-inch portable model with castors. Portability may help where built-in installation is impractical, but the unit still needs a workable place to operate and a suitable hookup arrangement.
Check the cabinet opening before choosing a model
Measure the actual opening and available depth, then compare them with the latest installation document for the exact model number. Bosch’s SPE68C75UC specification sheet gives a required opening width of 17 3/4–18 inches, a depth of 24 inches, and a minimum height of 32 1/8 inches. These are specifications for that model, not a universal standard for 18-inch dishwashers. Bosch also notes that specifications may change without notice (Bosch SPE68C75UC specification sheet).
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- Slimline Design with Large Capacity : The Midea built-in dishwasher boasts a slim body that takes up minimal space and is easy to fit. It features a digital control panel with an LED display and has been thoughtfully designed to accommodate larger plates, pots, and pans up to 11 inches in height.
- 8 Place Settings Dishwasher : With dimensions of 22.6D x 17.6W x 32.4H with adjustable legs, this under sink dishwasher provides a spacious and flexible interior for maximum dishware loading.
- 6 programs+3 functions : The 18-inch dishwasher offers six programs, including Heavy, Normal, ECO, Delicate, Quick, and Rinse washing programs. It also features Heated Dry, Hi-Temp, and Sanitize functions that meet all your daily needs. Note: ONLY use detergent specially for dishwasher because regular liquid dish soap will cause dishwasher problems.
- Heated Dry : Smart dishwasher ensures the best drying performance. The extra drying function offers a thorough drying performance (except for the Rapid and Self-clean cycle) with no additional towel drying required.
- HI TEMP : The HYGIENE wash cycle maintains the water temperature at 136°F (58°C) max , which can tackle even the heaviest soiled dishes. It is also suitable for cleaning baby bottles and children's dinner sets.
Other 18-inch models can have different dimensions. GE lists its GSM1860JSS at 32 1/2 inches high, 18 inches wide, and 22 1/2 inches deep (GE GSM1860JSS product page). This comparison is a reminder to use model-specific measurements rather than assuming a standard cabinet fit.
- Measure the opening’s width, height, and depth, including any obstructions that could affect installation.
- Check the manufacturer’s instructions for power, water-supply and drain connections, and required clearances. Confirm the installation conditions against local requirements.
- Verify that the planned utility routes work with the cabinet and the chosen machine before ordering.
- Ask the installer or manufacturer about any uncertain dimensions or connection requirements; do not rely on a nominal-width label.
Compare capacity and operating claims in context
Place-setting counts and resource figures vary by model and source. The available examples span different years and product types, so they are not an apples-to-apples ranking.
Rank #2
- Slimline Design with Large Capacity : The Midea built-in dishwasher boasts a slim body that takes up minimal space and is easy to fit. It features a digital control panel with an LED display and has been thoughtfully designed to accommodate larger plates, pots, and pans up to 11 inches in height.
- 8 Place Settings Dishwasher : With dimensions of 22.6D x 17.6W x 32.4H with adjustable legs, this under sink dishwasher provides a spacious and flexible interior for maximum dishware loading.
- 6 programs+3 functions : The 18-inch dishwasher offers six programs, including Heavy, Normal, ECO, Delicate, Quick, and Rinse washing programs. It also features Heated Dry, Hi-Temp, and Sanitize functions that meet all your daily needs. Note: ONLY use detergent specially for dishwasher because regular liquid dish soap will cause dishwasher problems.
- Heated Dry : Smart dishwasher ensures the best drying performance. The extra drying function offers a thorough drying performance (except for the Rapid and Self-clean cycle) with no additional towel drying required.
- HI TEMP : The HYGIENE wash cycle maintains the water temperature at 136°F (58°C) max , which can tackle even the heaviest soiled dishes. It is also suitable for cleaning baby bottles and children's dinner sets.
| Example | Published capacity or operating figure | Status and context |
|---|---|---|
| Bosch 18-inch ADA series in a 2019 design guide | Nine and ten place settings for two series; 3.0 gallons per cycle; annual consumption listed as 259 kWh and 645 gallons of water | Historical figures for the series in that guide, not current category-wide benchmarks. Bosch 2019 design guide. |
| Danby DDW1802EBLS, built-in | Eight place settings; up to 3.5 gallons per wash | Danby marks the model discontinued; its page’s continued availability does not mean it is a current buy. Danby DDW1802EBLS product page. |
| Danby DDW1805EWP, portable | Eight place settings; 52 decibels | Portable model with castors; the noise figure is the manufacturer’s published claim. Danby DDW1805EWP product page. |
Do not treat the Bosch historical series data and Danby product-page figures as if they came from the same year, test method, or product class. For a real shortlist, check current documentation for the models you can actually buy and compare capacity, water and energy use, and noise using their stated measurement context.
Choose features around how the kitchen is used
A smaller machine is not automatically convenient just because it occupies less width. Before settling on a model, look at its rack arrangement and whether it handles the dishes, cookware, and utensils your household washes regularly. Compare cycle options, published noise claims, warranty and service terms, and the installation work required. A household that cooks frequently may value loading flexibility and cycle choices more than a headline place-setting count.
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- Slimline Design with Large Capacity : The Midea built-in dishwasher boasts a slim body that takes up minimal space and is easy to fit. It features a digital control panel with an LED display and has been thoughtfully designed to accommodate larger plates, pots, and pans up to 11 inches in height.
- 8 Place Settings Dishwasher : With dimensions of 22.6D x 17.6W x 32.4H with adjustable legs, this under sink dishwasher provides a spacious and flexible interior for maximum dishware loading.
- 6 programs+3 functions : The 18-inch dishwasher offers six programs, including Heavy, Normal, ECO, Delicate, Quick, and Rinse washing programs. It also features Heated Dry, Hi-Temp, and Sanitize functions that meet all your daily needs. Note: ONLY use detergent specially for dishwasher because regular liquid dish soap will cause dishwasher problems.
- Heated Dry : Smart dishwasher ensures the best drying performance. The extra drying function offers a thorough drying performance (except for the Rapid and Self-clean cycle) with no additional towel drying required.
- HI TEMP : The HYGIENE wash cycle maintains the water temperature at 136°F (58°C) max , which can tackle even the heaviest soiled dishes. It is also suitable for cleaning baby bottles and children's dinner sets.
For portable machines, add practical checks: footprint, castors or other mobility features, hookup approach, and where the unit will be used and stored. A portable unit may avoid permanent under-counter installation, but it is not a built-in substitute with the same installation arrangement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Verify availability before treating a listing as a recommendation
A manufacturer page can remain online after a model leaves production. GE says the GSM1800FWW is no longer manufactured (GE GSM1800FWW product page), and Danby marks the DDW1802EBLS discontinued. Check the exact model number, current stock, warranty coverage, and service options with the seller or manufacturer before buying. Neither an official listing nor a historical specification sheet establishes current retail availability.
Quick Recap
Best Value
- Slimline Design with Large Capacity: This 18-in COMFEE' built-in dishwasher boasts a slim body that takes up minimal space and is easy to fit. It features a digital control panel with an LED display and has been thoughtfully designed to accommodate larger plates, pots, and pans.
- 8 Place Settings: Measuring 22.6"D x 17.6"W x 32.4"H with adjustable legs, this compact under-sink/built-in dishwasher delivers a spacious and flexible interior for maximum loading capacity. The upper rack features an adjustable height mechanism (up to 1.97 inches) to easily clear deep pots and various cookware, while the lower rack can hold extra-large plates and oversized dishware up to 13.78 inches in height.
- 6 Wash Cycles + 3 Functions: This 18-inch dishwasher offers six versatile wash cycles, including Heavy, Normal, Eco, Delicate, Quick, and Rinse. It also features Heated Dry, Hi-Temp, and Sanitize functions that meet all your daily needs. Note: ONLY use detergent specially for dishwasher because regular liquid dish soap will cause dishwasher problems.
- Heated Dry: This smart dishwasher ensures optimal drying performance every time. The advanced heated drying function delivers a thorough, cabinet-ready dry (available on all cycles except Rapid and Self-Clean), completely eliminating the need for towel drying.
- Hi-Temp: The Hygiene wash cycle boosts and maintains water temperatures up to 136°F (58°C) to effortlessly tackle even the most heavily soiled dishes. It is also perfectly suited for the deep cleaning of baby bottles and children's dinnerware.
Rank #4
- 8 PLACE SETTINGS: Racks are suitable to fit 8 place settings of dishes. There is a top cutlery rack and 2 other racks with a large removable cutlery basket.
- MULTIPLE FUNCTIONS: There are 6 washing programs to choose from- pots & pans, normal wash, china, quick wash, rinse only, and energy saver. Up to 24 hour delay start for you added convenience.
- DURABLE TUB: The tub is made of stainless steel for better efficiency performance.
- ENERGY STAR: Low energy consumption according to Energy Star standards.
- BUILT-IN STYLE: The dimensions of the unit are 22.6"D x 18"W x 32.4"H. This stainless steel built-in dishwasher is ADA-compliant
A practical shortlist checklist
- Installation type: Confirm that you want a fixed built-in or a portable machine.
- Fit: Match the exact model’s installation dimensions to the measured cabinet opening and available depth.
- Connections: Review power, water, drainage, and installation requirements for the model and your location.
- Loading: Compare place-setting claims with rack layout and the dishes you use.
- Operating claims: Check the model-specific source, date, units, and measurement context for water, energy, and noise figures.
- Purchase support: Confirm current availability, warranty, and service arrangements.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
