TL;DR: The faucet traces to at least 1700 BC, when the Minoan Palace of Knossos on Crete used stone and clay spouts to direct water through early plumbing channels. Over the next 3,700 years it barely changed until Al Moen burned his hands on a two-handle fixture in 1937 and invented the single-handle faucet. In 1931, Werner Wanzenberg of Evanston, Illinois patented a device allowing a sink and bath to run simultaneously from a single fixture. Original patent art prints of Wanzenberg's design are available framed or unframed.
In 1700 BC, the Minoan civilization on the island of Crete had hot and cold running water. The Palace of Knossos, the great Bronze Age complex at the center of Minoan culture, contained a plumbing network with clay pipes, cisterns, and stone spouts that directed water through the building for drinking, bathing, and sanitation. Four thousand years before the modern bathroom, one of the world's earliest civilizations had already solved the core engineering problem of the faucet: how to control water flow from a fixed point.
That the faucet took another thirty-seven centuries to gain a mechanism for mixing hot and cold water in a single stream is one of the stranger gaps in the history of everyday objects.
Ancient Origins: Minoan and Roman Plumbing
The Minoan faucet was not a faucet in the modern sense. It was a spout, a fixed stone or clay outlet that directed water where it needed to go. Flow was controlled upstream, by stoppers or by adjusting the cistern supply, rather than at the point of use. But the basic concept, a fixed infrastructure element that delivered water on demand, was fully present in Knossos in 1700 BC.
The Romans inherited and greatly expanded on this tradition. Roman aqueduct engineering was the most sophisticated water delivery system in the ancient world, carrying millions of gallons of water daily to cities across the empire through stone and lead-lined channels. Private homes of sufficient wealth had water connections, and Roman baths used bronze and lead fittings to direct flow from supply pipes into pools and washing basins.
Roman faucets were typically simple stopcocks: cylindrical or tapered plugs turned within a housing to open or close flow. Bronze and lead were the primary materials. Hot water was heated in separate boilers and piped separately from cold, arriving at the point of use through two distinct spouts or two distinct handles. The two-spout or two-handle configuration that Al Moen would later find dangerous in 1937 was, in its Roman prototype, already more than two thousand years old.
The fall of the Roman Empire in the fifth century disrupted water infrastructure across Western Europe. Aqueducts fell into disrepair. Urban plumbing largely disappeared in European cities for the better part of a thousand years. The sophisticated water management of the ancient world had to be rediscovered gradually through the medieval period and into the Renaissance.
Medieval and Early Modern Development
Medieval European plumbing was primarily a feature of monasteries and large castles, institutions with the resources and administrative capacity to maintain water infrastructure. Monastery complexes frequently included conduit systems that brought water from springs or streams to kitchen and washing facilities. The Great Conduit in London, built in the late 13th century, is one of the earlier examples of civic water supply in medieval England.
By the 16th and 17th centuries, wealthy households in England and continental Europe were increasingly incorporating fixed plumbing, with lead pipes carrying water from rooftop cisterns fed by rain collection or street-level supply. The fittings at these points of use were typically simple: a plug or stopcock that opened and closed flow, delivering water either hot or cold from separate supplies.
The 19th century brought municipal water systems to major American and European cities, dramatically expanding access to indoor plumbing. Cast iron pipes replaced lead in many applications. The invention of the globe valve in the mid-19th century, which used a movable disk to control flow more precisely than earlier stopcock designs, became the standard mechanism in household faucets for decades. Each handle controlled a separate supply: one for hot, one for cold. The user mixed the streams in the basin rather than in the fixture itself.
This arrangement was the state of the art for roughly two thousand years, from Roman stopcocks through Victorian-era globe valves. It had a serious flaw that nobody solved until the 1930s.
Al Moen and the Single-Handle Faucet
In 1937, a 21-year-old engineering student named Alfred Moen was washing his hands at a two-handle faucet in his apartment in Seattle when the hot water came on suddenly and scalded him. The two-handle system required constant adjustment between the hot and cold handles to find a comfortable temperature, with no intermediate mixed position. At the moment the building's boiler delivered a surge of hot water, Moen had the hot handle too far open and no quick way to correct for it.
Moen spent the next several years developing a solution: a single-handle faucet that mixed hot and cold water internally before delivery, allowing the user to set a temperature by rotating a single control rather than balancing two. He worked on the design through the late 1930s, filing his first patent in 1945 and licensing the design to a manufacturer in 1947. The Moen single-handle faucet reached the consumer market and was eventually manufactured by Standard Screw Company, which later became Moen Incorporated.
Moen's single-handle design was not just a convenience improvement. It changed the fundamental logic of faucet operation from two independent flow controls requiring simultaneous adjustment to one integrated control. The mixing cartridge inside Moen's faucet allowed temperature selection to be retained between uses: once a comfortable temperature was set, turning the faucet off and back on returned to that temperature automatically. This feature, which every modern single-handle faucet provides, was Moen's original innovation.
Werner Wanzenberg and the 1931 Patent
Before Moen's single-handle breakthrough, other inventors were working on different problems in faucet design. On December 8, 1931, Werner Wanzenberg of Evanston, Illinois was granted a patent for a device that allowed users to operate a sink and a bath simultaneously from a single fixture, with independent controls for each.
Wanzenberg's patent addressed a practical problem in bathroom design: the typical arrangement required separate plumbing connections for the sink and the tub, and running both at the same time required managing two completely independent sets of controls. His design combined the supply connections and added a diverter mechanism that could send water to either or both fixtures simultaneously, with individual flow controls for each.
While Wanzenberg's specific design did not become a widespread standard, it represents an important moment in faucet history: the recognition that a single fixture could serve multiple functions without requiring the user to manage the plumbing infrastructure directly. The diverter mechanism in modern shower-bath combinations, which allows the user to switch water flow between the tub spout and the showerhead, applies the same principle Wanzenberg patented in 1931.
The bath faucet as a category of invention is a study in the long arc of incremental improvement. Four thousand years of essentially the same basic design, a spout controlled by a valve, followed by a burst of innovation in the 20th century that transformed both the mechanics and the user experience. Wanzenberg's 1931 patent sits at the beginning of that burst.
Frequently Asked Questions
When was the faucet invented?
The earliest known plumbing fixtures resembling faucets date to around 1700 BC at the Minoan Palace of Knossos on the island of Crete, which had stone and clay spouts directing water through an early plumbing network. The Romans developed bronze and lead stopcocks for private homes and public baths. The modern residential faucet with its globe valve mechanism developed in the 19th century alongside municipal water systems.
Who invented the single-handle faucet?
Alfred Moen invented the single-handle faucet after burning his hands on a two-handle fixture in Seattle in 1937. He filed his first patent in 1945 and licensed the design for commercial production in 1947. Moen's design mixed hot and cold water internally before delivery, allowing temperature control with a single rotating handle rather than two separate knobs. It replaced a two-spout design that had been standard since Roman times.
What did Werner Wanzenberg's 1931 patent do?
Werner Wanzenberg of Evanston, Illinois patented a bath faucet design on December 8, 1931 that allowed users to supply both a sink and a bathtub from a single fixture with independent flow controls for each. His design used a diverter mechanism to route water to either or both outlets simultaneously, anticipating the shower-bath diverter design that is standard in modern combination tub-shower fixtures.
Why did Roman faucets use two spouts?
Roman faucets used two separate spouts or handles because hot and cold water came from separate sources: cold water from aqueduct supply and hot water from boilers or hypocaust heating systems. Without a mechanism to mix the streams inside the fixture, the only option was to deliver them separately and let the user mix them in the basin. This two-supply arrangement remained the standard for roughly two thousand years until Al Moen's single-handle design in the 1940s.
What is the most significant innovation in faucet history?
The most consequential faucet innovation was Al Moen's single-handle design, patented in 1945, which mixed hot and cold water internally and allowed temperature control with a single rotating handle. This replaced the two-handle system that had been standard since ancient Rome. Moen's design also introduced temperature memory: the ability to return to a previously set temperature without readjustment, a feature every modern single-handle faucet provides.
Written by Rider Tuff, founder of Timeless Patents. Timeless Patents makes museum-quality patent art prints from original U.S. Patent Office documents, celebrating the inventors behind everyday objects that shaped how we live. Every print is available framed or unframed. Shop the full home collection →
