Unidrain Wall Mounted Linear Wet Room Drains

Unidrain is widely recognised as the company that pioneered the wall-mounted linear drain. The original concept was developed in 2003 by Danish architect Claus Dyre, introducing a drainage system that sits directly against the wall rather than within the shower floor. This innovation transformed wet room design by allowing the floor to fall in a single direction, simplifying installation while creating a cleaner, more minimalist appearance.

Today, Unidrain products are specified in more than 30 countries and have received international design recognition, including the German Design Award and the iF Product Design Award. However, the difference extends well beyond aesthetics.

Unlike many linear drains, Unidrain combines premium architectural design with independently verified technical performance. The system carries BBA certification for use on both timber and concrete floors, has been tested to BS EN 1253, and is designed as part of a complete waterproofed wet room system rather than simply a standalone drain.

One of the advantages of a Unidrain wall-mounted drain is that the finish can be selected to complement the wider bathroom design.

ClassicLine is the traditional choice, with decorative brushed stainless steel grates including Anniversario, Square, Stripe and Column. It's a popular option where the drain is intended to remain a visible design feature.

For more contemporary interiors, HighLine Panel replaces the grate with a smooth metal panel, available in brushed stainless steel and premium PVD finishes including Brass, Copper, Black and Polished Steel. These finishes are often specified to coordinate with taps, shower valves and other brassware, creating a more cohesive bathroom design.

HighLine Custom allows the surrounding floor tile to be bonded directly onto the removable drain cover. This leaves only a narrow drainage slot visible and is particularly effective with large-format porcelain and natural stone tiles, where uninterrupted floor lines are a key part of the design.

For polished concrete, resin and terrazzo floors, HighLine Cassette has been developed specifically to integrate with poured floor finishes, providing a clean transition between the drain and surrounding floor.

Rather than affecting drainage performance, the choice of finish is almost entirely aesthetic, allowing specifiers to achieve the desired visual effect without compromising the engineering of the drainage system.

Yes. The HighLine Custom option is designed specifically for projects where the drainage should be as discreet as possible.

Instead of using a visible stainless steel grate or panel, the surrounding floor tile is bonded directly onto the removable drain cover. Once installed, the drain blends almost seamlessly into the surrounding floor, leaving only a narrow drainage slot visible. This creates a clean, uninterrupted floor finish that is particularly popular in luxury residential bathrooms, boutique hotels, and contemporary spa environments.

HighLine Custom works particularly well with large-format porcelain and natural stone tiles, helping maintain continuous floor lines without compromising drainage performance or access for future maintenance.

What sizes are available for Unidrain wall-mounted linear drains?

Unidrain wall-mounted linear drains are available in one of the broadest standard size ranges on the market, with lengths from 300mm to 2400mm.

This allows the same drainage system to be specified for everything from compact en-suite bathrooms through to large walk-in showers, spa facilities, hotels, and commercial washrooms. Selecting an appropriately sized drain also helps achieve a balanced visual appearance while ensuring sufficient drainage capacity for the shower area.

Where a standard length is unsuitable, bespoke drains can also be manufactured to suit non-standard layouts, unusual room dimensions, or specialist architectural projects. This flexibility makes Unidrain particularly popular on high-end residential and commercial developments where standard products may not fit the design intent.

The standard Unidrain outlet delivers a flow rate of up to 54 litres per minute, providing ample capacity for the vast majority of domestic shower installations, including many rainfall showerheads.

Where higher water volumes are expected, such as multi-outlet shower systems or larger rainfall heads, a high-capacity vertical outlet is available, increasing drainage performance to up to 90 litres per minute.

For refurbishment projects where installation depth is restricted, a low-profile outlet can also be specified without compromising the overall quality of the drainage system.

When specifying any wet room drain, it's good practice to ensure the drain's maximum flow rate comfortably exceeds the combined output of the shower fittings to prevent water backing up during use.

Can Unidrain wall-mounted drains prevent stagnant water and bad odours?

Yes. Unidrain outlets are designed to encourage efficient drainage while incorporating a water-seal trap that helps prevent foul air from travelling back through the waste system.

The internal channel is shaped to minimise areas where water can collect unnecessarily after use, helping the drain remain cleaner and reducing the potential for stagnant water within the channel.

For customers looking to reduce routine maintenance even further, the optional Less Cleaning Trap has been designed to allow hair and soap residue to pass more freely into the waste system, reducing the amount of debris that typically needs to be removed manually during cleaning.

As with any shower drain, periodic maintenance remains important to ensure optimum drainage performance over the long term.

Yes. Unidrain wall-mounted drains have been designed for installation in both suspended timber floors and solid concrete floor constructions, making them suitable for both refurbishment projects and new-build developments.

The drainage body itself remains the same, but the surrounding floor construction and waterproofing details differ depending on the substrate. Timber floors require additional consideration around structural movement, joist layouts, and waterproofing membranes, while concrete installations typically rely on a more rigid floor structure.

What is the new Unidrain Less Cleaning Trap, and can it be retrofitted?

The Less Cleaning Trap is an upgraded waste trap developed to reduce the amount of routine drain maintenance required.

Rather than allowing hair and soap residue to accumulate within the trap itself, the redesigned internal geometry encourages much of this material to pass directly into the building's waste system. This means the drain typically requires cleaning less frequently while maintaining effective drainage performance.

One of its major advantages is compatibility. The Less Cleaning Trap can be retrofitted to existing Unidrain outlets, including many earlier installations, allowing current owners to upgrade without replacing the complete drainage system. That said, it is NOT compatible with low-profile outlets.

Although no shower drain is entirely maintenance-free, the Less Cleaning Trap significantly reduces one of the most common causes of blocked wet room drains.