The answer before the details
This guide is about an open counter beneath a wall cabinet. If you mean operating the machine inside a cupboard, start with the enclosed-cabinet approval checklist. A short enough body does not establish permission for that arrangement.
A dishwasher body shorter than 18 inches may still need more room to operate. Danby DDW631SDB is a candidate to investigate; HAVA R01’s stated 18.1-inch height already exceeds an 18-inch opening. Check the current installation drawing, hoses and door access before ordering.
Research editor: Nicholas Bauer, Founder & Research Editor · Research checked October 6, 2026
Example only: 18″ opening − 17.25″ body = 0.75″ remaining. This is not verified operating clearance; your opening may differ.
A faucet-fed model to investigate first
The Danby DDW631SDB has a manufacturer-listed height of 17.25 inches. That makes it a more relevant starting point than the 18.1-inch HAVA R01 for an 18-inch opening. The HAVA body exceeds that opening before filling access or operating clearance is considered.
17, 17.5 or 18 inches: what does your opening rule out?
An “18-inch dishwasher” can describe a product’s width rather than its height. For this guide, the number means the measured vertical gap above your counter. Compare that gap with the appliance’s stated height; never swap width and height from a listing.
| Measured clear opening | Danby’s listed 17.25-inch body | HAVA R01’s listed 18.1-inch body |
|---|---|---|
| 17 inches | Body exceeds the opening by 0.25 inch. | Body exceeds the opening by 1.1 inches. |
| 17.5 inches | 0.25 inch remains before installation requirements. | Body exceeds the opening by 0.6 inch. |
| 18 inches | 0.75 inch remains before installation requirements. | Body exceeds the opening by 0.1 inch. |
| 18.5 inches | 1.25 inches remains before installation requirements. | 0.4 inch remains before filling and installation requirements. |
These are subtraction examples, not minimum-clearance recommendations. A positive result means only that the stated body height is smaller. It does not confirm ventilation, leveling, top-fill access or safe operation.
Body-height sources: Danby US DDW631SDB specifications and HAVA R01 specifications, rechecked October 6, 2026.
Measure the spot with the cabinet door in use
Record the lowest trim or light, usable counter width and depth, then the space needed to lower the dishwasher door. Also picture opening the cupboard and reaching a tank-fill opening. If your plan depends on moving a connected appliance every time, resolve the manufacturer’s moving and hose instructions before buying.
Measure three spaces—not just the body
Measure to the lowest obstruction, including lights and trim. Check the actual installation requirements separately from the body dimensions.
For a top-fill tank, check whether you can reach the inlet and pour as directed. An appliance that slides underneath may still be awkward to refill there.
Mark the open-door footprint and rack access. Keep the route to the sink usable while unloading.
Do not solve a missing gap with an improvised filling hose. Confirm an approved filling method or choose a position where the inlet is accessible. A faucet-fed model removes the manual top-fill task, but only if your faucet permits the connection.
Then measure the plates you want to wash. Exterior height cannot establish rack capacity.
Four checks before clicking a buying option
- Measure the lowest point. Include cabinet trim, lighting and anything hanging underneath.
- Check the supporting surface. The Danby body is listed as 21.65 inches wide and 20.65 deep. Hoses and connections need additional consideration.
- Confirm faucet compatibility. This model does not have a water tank. Use the manufacturer’s installation guide and exact faucet details.
- Check real loading access. Make sure you can lower the door, pull out the rack and handle the plates you use.
What makes the purchase worthwhile?
A workable spot close to the sink can turn a repeated dishwashing chore into a load-and-unload routine. A cramped spot that blocks cooking, the faucet or cabinet access can do the opposite. Picture both cooking and cleanup before assigning this counter space to a machine.
Check the exact model and current offer.Affiliate shopping link
The researched comparison covers HAVA R01 and Danby DDW631SDB. For another model, use the custom-model measurement worksheet with a confirmed current manual. The COMFEE source conflicts still need resolving before relying on their dimensions.
Research checked October 6, 2026. Sources: HAVA specifications · Danby specifications. We have not physically tested either model.
Six models, with the height question kept separate
| Model | What an 18-inch opening tells us |
|---|---|
| HAVA R01 | Listed 18.1-inch body: excluded before operating space. |
| HAVA R09 | Product page lists 18.1 inches; manual lists 18.05. Both exceed 18 inches, before top-fill access. |
| COMFEE CDC17P2AWW | Both published height figures exceed 18 inches: excluded. |
| BLACK+DECKER BCD6W | Brand page lists 16.9 inches; manual lists 17¼. Both are below 18, but the conflicting measurements require confirmation for a tight spot. Faucet-fed. |
| Danby DDW631SDB | Listed 17.25-inch body: investigate installation requirements. |
| COMFEE CDC22P2AWW | Manual shows 17¼ inches: investigate, but conflicting depth remains unresolved. |
A body that is shorter than the opening passes only the first question. Hoses, leveling, the opening door and the manufacturer’s installation conditions still determine whether the spot is usable. Do not turn the leftover fraction of an inch into a ventilation allowance.
If your faucet permits the connection, the Danby vs COMFEE six-place comparison is the next useful read. If it does not, changing brands between those two does not solve the water-supply obstacle; use the faucet guide first.
Height evidence: HAVA R09 specifications · BCD6W specifications · HAVA specifications · Danby dimensions · COMFEE CDC17 drawing · COMFEE CDC22 drawing. These are screening notes, not installation approvals.
