Campervan Grey Water Tanks Specialists

The UK's most comprehensive directory of campervan grey water tanks specialists. 61 verified companies, independently rated and reviewed.

61 Specialists

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Added byJoe Tannorella·Published 13 December 2025·Updated 1 October 2026

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Best Campervan Grey Water Tanks Specialists

Ranked by verified Google ratings and customer reviews. We track 61 companies offering campervan grey water tanks across the UK — here are the highest rated.

★5.0(19)

Key Facts About Campervan Grey Water Tanks

✓ A professional grey water system costs £700–£2,500 fitted, depending on tank location, size, and features like 12V heating elements.
✓ Fitting an underslung tank with all plumbing and sensors is typically a one-to-two-day job for a specialist workshop.
✓ The service involves mounting a tank, plumbing waste lines from sinks and showers, and adding a secure, accessible drainage tap.
✓ Professionals fabricate custom steel brackets for underslung tanks, ensuring optimal ground clearance and a secure fit specific to the vehicle's chassis.
✓ Buyers choose between internal tanks that use cupboard space or underslung tanks that save interior room but require more complex mounting.
✓ Onboard grey water collection is essential for self-containment, a requirement for many UK campsites and 'leave no trace' wild camping spots.

Why Choose Professional Campervan Grey Water Tanks?

A DIY grey water system often fails, causing leaks and persistent odours. Professional installation solves this with correctly sloped pipes for fast, complete drainage. They also fit proper P-traps and vents, which are essential for stopping smells from backing up into your living space. This means no gurgling sink and no foul air. Professionals understand vehicle dynamics too. They position tanks to preserve ground clearance and maintain balance, avoiding the scraping and handling issues common with DIY jobs. In practice, a pro system is the difference between a reliable van and a constant source of problems.

When choosing a specialist, ask specific questions. Inquire how they vent the tank and what pipe gradients they use. A good installer provides clear answers; vague responses are a red flag. Check their experience with underslung systems on your specific van chassis and ask if they can integrate level sensors or heated pads for winter use. A complete, professionally fitted grey water system typically costs £800 to £2,500. The final price depends on tank size, location, and extras like heating. Installation usually takes one to three days, a worthwhile investment to prevent future issues.

Finding a skilled van plumber is difficult because their best work is hidden. CamperBrain simplifies the search by connecting you with vetted specialists who focus on vehicle plumbing. Instead of guessing, you can browse portfolios that showcase their underslung pipework and tank installations. Detailed reviews from other builders provide real insight into their process and long-term reliability. This allows you to request quotes from multiple qualified professionals, confident you will find an expert who understands the demands of a mobile water system.

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Frequently Asked Questions

What is a campervan grey water tank system?

It's the system that collects wastewater from your sink and shower. This is called ‘grey water’. The system includes a tank, usually underslung (mounted under the van), and all the associated plumbing. This setup is a key part of being self-contained, allowing you to collect your waste responsibly. A good system features a simple, accessible drain tap for emptying at designated disposal points. In practice, this keeps campsites clean and helps you comply with wild camping ethics, making your travels much more sustainable and hassle-free.

How much does a grey water tank system cost for a campervan?

A professionally fitted grey water system typically costs between £800 and £2,500. The final price depends on tank size, material, and overall complexity. Underslung tanks, which save precious internal space, cost more to install because they require custom brackets and chassis work. A simpler, internal tank setup will be at the lower end of that scale. For most builds, the price also reflects optional extras like heated tank pads for winter use and level sensors, which add to the cost but provide significant convenience on the road.

How long does installing a grey water tank take?

The installation time depends entirely on the system's complexity. A straightforward internal tank might only take a day for a professional to fit. However, a custom underslung tank with heating elements and sensors is a much bigger job. This could take a converter two to three full days to complete properly. The process involves fabricating mounting brackets, drilling through the floor for plumbing, and carefully routing all the pipework to avoid chassis components. It's often done alongside the fresh water system to ensure everything integrates perfectly.

Can I fit a grey water tank system myself?

Yes, it’s a popular DIY project, but it has its challenges. Fitting a simple internal tank is quite achievable and requires basic plumbing skills. Mounting an underslung tank, however, is much harder. You need to work safely under the vehicle and may have to fabricate custom metal brackets to secure the tank to the chassis. Drilling through the van floor for waste pipes is a point of no return. A poor seal can lead to leaks and rust. For many people, the peace of mind from a professional, leak-free installation is worth the investment.

What vans are grey water tanks suitable for?

Grey water systems can be fitted to almost any panel van. The main limiting factor is available space. Larger vans like the Sprinter, Crafter, and Ducato easily accommodate big underslung tanks, often over 70 litres. For medium-sized vans such as the Transit Custom or VW Transporter, space is tighter. This often means choosing a smaller, vehicle-specific underslung tank or opting for a compact internal tank instead. A good converter can find a clever solution for any build, ensuring the tank placement maximises ground clearance and avoids mechanical parts.

What are the benefits of a proper grey water system?

The main benefits are convenience and responsibility. A grey water tank allows you to use your sink and shower without draining dirty water directly onto the ground. This is essential for staying at formal campsites and crucial for following “leave no trace” principles when parked up elsewhere. It makes your van more self-sufficient, extending your trips. A well-designed system, especially one with a level gauge, removes the guesswork of when to empty. Ultimately, it’s a core component of a fully-featured campervan conversion that makes daily life on the road much more comfortable.

How do I find a grey water installation specialist?

Look for conversion companies that highlight their plumbing and off-grid system expertise. Their portfolios should show examples of neat underslung tank installations and tidy plumbing runs inside the van. Check for experience with your specific van model, as they will know the best locations and tank types to use. Ask about the components they prefer, such as tank materials and drain tap types. A good specialist will confidently discuss the pros and cons of different setups, from simple gravity-fed drains to more complex systems with pumps.

What should I look for in a quality grey water installation?

A quality job is all in the details. Check for securely mounted tanks, especially underslung ones, which must have robust, rust-proofed brackets. All plumbing should be properly clipped and routed away from hot exhausts or moving suspension parts. The pipe runs must have a consistent downward slope to prevent water from pooling and causing bad smells. Look for an easily accessible, large-bore drain tap that won't clog. Finally, any holes drilled through the van floor must be perfectly sealed with a high-quality sealant to prevent water ingress and future rust problems.

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Expert Insights

"For proper balance, your grey water tank should match your fresh water capacity; for most medium-wheelbase builds, this means a 70-litre underslung tank is the sweet spot for a multi-day trip."

"Don't compromise on tank material. A high-density polyethylene (HDPE) tank with a 5-8mm wall thickness resists road debris and temperature changes far better than the cheaper, brittle plastics found online."

"For year-round travel, an underslung tank needs a 12V heating pad. These heaters, typically costing £50-£100, prevent drain lines from freezing solid, a common and costly problem in sub-zero conditions."

"Always choose a simple ball valve for your drain tap over complex electric valves. This manual design is far less likely to clog with food particles, ensuring reliable drainage with only a seasonal flush-out required."

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