Most people take the range of household appliances we use every day for granted. But each of these time-saving conveniences had a beginning, which, for many, happened a very long time ago in another place and time. Take, for instance, the two devices we use to sanitize stuff — the washing machine and the dishwasher. Each took a very different evolutionary path, leading one to have a window, while the other did not.
Both can use extremely hot water to properly sanitize things so they're hygienically safe to use again, producing steam and condensation that would normally block the view of anything inside the machine. While tableware remains securely 'locked' in place in a dishwasher, the washing machine's spinning drum tosses clothes around freely and constantly wipes the window clean. Additionally, seeing the clothes and the associated water level was one way to eliminate some of the guesswork from the equation, especially in early models that lacked sophisticated technology, thus making it the primary reason for the window.
The history of automated laundering stretches back centuries. One of the earliest attempts at automating the mundane task of 'doing the laundry' was patented by an Englishman in 1691 as a 'Washing and Wringing' contraption. Many different versions came and went, most of which looked nothing like the machine we know and love today. In 1851, American inventor James King created the first 'modern' washing machine with a drum that rotated via hand crank. One design that stuck around was the top-loading feature, where clothes were dropped into the top of a barrel or tub filled with water, making the entire process easy to monitor.
Early Innovations and the Rise of Top-Loading Machines
James King's 1851 design was rudimentary, but it set the stage for more advanced mechanisms. The top-loader was intuitive: users could simply lift the lid, drop in clothes, and observe the washing action. For decades, this was the dominant configuration. However, as technology progressed, engineers began exploring different form factors. The top-loader's window was essentially the open lid, but as fully enclosed machines emerged, the need for a viewing port became apparent.
In the late 19th and early 20th centuries, washing machines evolved from hand-cranked wooden tubs to motorized appliances. Companies like the Hurley Machine Company (1907) introduced the electric Thor washing machine. Yet these early electric models were still top-loaders with no window in the lid — users simply opened the top to check progress. The real shift came with the front-loading design.
The Bendix Revolution and the Birth of the Window
It wasn't until 1937 that American engineer John Chamberlain, working for Bendix Aviation Corporation, built the first machine that automatically washed, rinsed, and spun clothes dry in a single cycle. This Bendix Home Laundry was the first to feature a front-loading design, creating a whole new dilemma: the water level still needed to be monitored, but now the drum was sealed inside a metal cabinet. Chamberlain installed a round, see-through window made of heat-resistant glass. This solution allowed users to see the water level and the condition of the clothes without opening the door and losing heat or water. Moreover, clothes — especially delicate fabrics — can easily become tangled during the wash cycle, and a window allows the user to spot and interrupt such issues. The invention was a huge success and was quickly adopted as a standard design feature that even the best front-load washer brands use today.
The window also served a psychological purpose: it reassured users that something was happening inside, building trust in an appliance that operated behind closed doors. As front-loaders became popular in Europe and later in North America, the window became a defining visual element of laundry rooms.
The Dishwasher's Separate Path
Meanwhile, one of the earliest patented versions of the dishwasher splashed onto the scene in 1850. And no, it wasn't the inventor's kid or spouse, but a mechanized appliance concocted by Joel Houghton. This patent described a hand-cranked wooden device that splashed water onto dishes. While not a huge hit, it did get other industrious minds spinning. In 1886, Josephine Garis Cochran patented the first 'modern' dishwasher, a hand-cranked machine with dish racks that used water pressure to clean instead of harsh dish-breaking scrubbers. Cochran's machine was a commercial success among hotels and restaurants, and it set the standard for future designs.
Believe it or not, watching dishes get sparkling clean was actually considered aesthetically unappealing. Early users found the sight of food particles swirling in dirty water to be off-putting. But there are more technical reasons why windows were omitted from dishwashers. Since dishwashers were more compact than washing machines, their size limited where features like detergent compartments could be placed. A dishwasher with a window would require additional seals and insulation to retain heat and prevent leaks. The window itself would have to withstand high temperatures and repeated cycles, adding cost and complexity. Most importantly, there was no practical need: dishes remain stationary in racks, and there is no water level to monitor because the spray arms recirculate water. The cycle's progress can be indicated via simple timers or lights. As a result, manufacturers never adopted windows as a standard feature.
Another factor is that dishwashers are often installed flush with cabinetry, and a window would break the seamless front panel design. High-end models today sometimes offer a small window or a 'clean light' beam on the floor, but these are optional features rather than necessities.
Technical Comparison: Why Windows Make Sense for One but Not the Other
To understand the divergence, consider the physical processes inside each machine. In a washing machine, clothes are tumbled in a drum that fills with water, then drains, spins, and fills again. The user benefits from seeing if the water level is adequate for the load size — too little water can damage clothes and the machine; too much can cause frothing. The window also allows visual confirmation that the detergent has been dispensed and that the clothes are moving freely. In contrast, a dishwasher's spray arms operate with a fixed amount of water that is heated and recirculated. The water level is not critical because it does not need to cover the dishes; instead, high-pressure jets do the cleaning. The only visual feedback needed is whether the dishes are clean, which can be assessed at the end of the cycle.
Heat retention is another consideration. Dishwashers use more intense heat (sometimes up to 160°F for sanitizing cycles) and need to maintain that temperature for effective cleaning. A window, even with double glazing, would allow heat to escape more readily than a solid steel or plastic door. Washing machines also use hot water, but they often operate at lower temperatures and have a shorter cycle duration, making heat loss less critical. Furthermore, the window in a washing machine is typically smaller relative to the door area, reducing thermal loss.
Historical Milestones and Cultural Impact
The Bendix Home Laundry was not just a technological leap but a cultural one. It allowed homemakers to do laundry without constant attendance, freeing up time for other activities. The window became a portal to a new era of domestic automation. By the 1950s, front-loading washing machines with windows were common in European households, while American households favored top-loaders. However, the window remained a symbol of modern convenience. In the 1970s and 1980s, Japanese and Korean manufacturers began exporting front-loaders with large windows, often tinted or with decorative patterns. Today, many front-loaders feature oversize doors to enhance visibility.
In contrast, the dishwasher never gained a window, despite some attempts in the 1960s to create see-through models. Consumer research indicated that users did not want to see the interior in action, and manufacturers focused on improving insulation and noise reduction instead. The dishwasher door is typically covered by a metal or plastic panel that matches the kitchen cabinetry, hiding the machine's workings entirely.
Modern Advances: Are Windows Becoming Obsolete?
With the advent of smart appliances and sensors, the original reason for the washing machine window — monitoring water level — is no longer necessary. Modern machines use load sensors, automatic detergent dispensers, and AI to optimize water usage. However, the window persists because it has become a design hallmark. Users now expect it, and it provides a way to peek at the spin cycle's mesmerizing motion. Some manufacturers have even introduced porthole-like windows in top-loaders, although these are rare.
For dishwashers, innovations like 'third rack' and 'auto-open' doors have not prompted the addition of a window. If anything, the trend is toward fully integrated models where the front panel is hidden behind cabinet doors, making a window impossible. Some luxury brands offer a small 'info window' that displays cycle time or remaining minutes, but not a view of the interior.
In the realm of industrial or commercial appliances, windows do appear in some dishwashers used in laboratories or sterilization settings, where visual confirmation of the cycle is critical for safety. But for home use, the answer to the window question remains firmly divided: washing machines have them for historical and practical reasons; dishwashers do not because they never needed one, and design constraints discouraged their adoption.
Source: SlashGear News