So, you’re diving into the world of campervan conversions, and you’ve hit the “water tank” chapter. It might not be the most glamorous part of vanlife, but trust me, getting your water system right is a game-changer. Let’s break it down and help you make sense of all things water tanks.
Why Water Tanks Matter
Imagine waking up in your cozy van, craving a cup of coffee, only to realise there’s no water. Or worse, you’re mid-shower, and the water sputters out. Not fun. A reliable water tank ensures you have water for drinking, cooking, cleaning, and those impromptu roadside showers.
Types of Water Tanks
1. Freshwater Tanks
These are your main source of clean water. Sizes vary, but common capacities range from 10 to 100 liters. Think about whether you’ll have daily showers and dishwashing? Go bigger. Just the occasional cup of tea? Smaller might suffice.
2. Grey Water Tanks
This is where used water from sinks and showers goes. It’s essential to have one to prevent dumping wastewater directly onto the ground, which is a big no-no in most places.
3. Black Water Tanks
Typically found in RVs with built-in toilets. If you’re using a composting toilet or public facilities, you might skip this.
Choosing the Right Tank
Before you commit to a tank, it’s worth stepping back and thinking about a few practical bits.
Size Matters
Consider your water usage habits. Are you off-grid for days, or do you frequent campsites with facilities? For extended off-grid adventures, a larger tank (around 70-100 liters) is ideal.
Shape and Fit
Space is premium in a van. Opt for tanks that fit snugly in available spaces, like over wheel arches or under seats. Before you commit to a tank, it’s worth stepping back and thinking about a few practical bits.
Material
Most tanks are made of food-grade plastic, which is lightweight and durable. Ensure it’s BPA-free to keep your water safe.
Climate
If you’re chasing winter or heading into chilly spots, think about freezing risks and whether your tank needs to live inside the van or get a proper insulation jacket.
Budget and Timescale
Budget and complexity go hand-in-hand. Some tanks are simple plug-and-play, others might need custom brackets, extra plumbing, or a few weekends of head scratching.
Weight Distribution
Don’t forget about weight distribution too. Plonking 70 litres of water (that’s about 70kg!) all on one side of the van might affect how your rig handles on the road. Try to keep things balanced.
Accessibility
And lastly, consider access and refilling. Make sure your tank’s filler point isn’t in some awkward, back-breaking spot. You’ll thank yourself later when you’re hunched over in the rain at a campsite tap! Some people prefer to have an external filler cap or backfill connection, whereas others might prefer the portability of something like a Water Hog or smaller capacity container.
Installation Basics
Positioning: Inside installations are protected from freezing but take up space. Underslung tanks save interior space and have a lower and more central centre of gravity. However, they need insulation in colder climates. Our 7mm thermoliner is a great option for this.
Plumbing: Use food-grade hoses. Incorporate a pump (manual or electric) to move water to your taps.
Ventilation: Tanks need a vent to allow air in as water is drawn out, preventing a vacuum.
Maintenance: Regularly clean your tanks to prevent algae and bacteria buildup.
Note: For more detailed instructions and videos on how to install underslung water tanks, check out our Instagram (@campervanshop).
Top Picks from The Campervan Shop
When it comes to choosing a water tank, The Campervan Shop has a tidy little selection that covers most van setups. Let’s take a look:
Water Tanks of Every Size (18L – 100L)
First up, there’s Flat Water Tanks that start at 18 Litres. These are brilliant if you’re tight on space and just need a compact solution to tuck under a bench or fit into a smaller build. It’s great for short trips, weekenders, or builds where space is at a premium.
Then there’s several Upright Tanks too, which have a nice slim profile. It’s ideal if you want to save floor space and don’t mind stacking things vertically – think cupboard or wardrobe installs. Slightly more capacity than the flat version, but still very manageable.
If you’re going all-in on your setup, you might want to look at some of our larger tanks which go up to 100 Liters! Now we’re talking proper shower or sink usage, even for a couple of days off-grid. They come in several sizes, so it’s handy for tucking into the spaces you have available whether in a tall corner or flat on the floor for a lower center of gravity. But remember, 70 litres of water is 70 kilos of weight, so you’ll want to plan your install wisely.
All of these tanks can be supplied as individual items, water tank installation kits, waste tank installation kits, and with or without underslung mounts.
Water Hog (50L)
If you’re not quite ready to commit to a built-in tank or just want a bit of backup, the good ol’ Water Hog is a classic. It’s basically a big rolling container (like a chunky wheeled suitcase for water) that you can fill up at a tap and wheel back to your van. Super handy for wild camping or when you’re parked too far from the fill-up point. It’s also ideal if you want to keep your setup flexible—no plumbing required. Just hook it up to your system with a pump or fill your built-in tank manually. It’s a solid choice for first-time vanlifers or those who prefer to travel light and top up as they go.
Similar products include the 38L Wastemaster and the 23L Fiamma Waste Carrier.
Underslung Tanks
Now, if you’re trying to save every inch of interior space (and let’s be honest, who isn’t?), underslung water tanks are the way to go. These mount beneath the van, totally out of sight, which keeps your living space clear and gives you more room for gear, storage, or just stretching out. The Campervan Shop offers different sizes to suit different needs and vehicle types, so whether you’re after something modest like a 40L or something a bit more robust like a 70L or 80L, there’s an option that’ll fit. Just remember—underslung tanks are more exposed, so if you’re travelling in colder climates, you might want to look into 7mm thermoliner or heating to stop things freezing up in winter.
Vehicle Specific Campervan Underslung Tank Kit
If you’re after a full, no-fuss water system and you’d rather not cobble together parts from all over the internet, the Campervan Underslung Fresh & Waste Water Tank Kit is a game changer. It’s an all-in-one package specifically designed for campervan use, and it comes with everything you need to get both fresh and waste water sorted in one go—tanks, brackets, fixings, pipework, even breather valves. This kit simplifies installation massively, especially if DIY plumbing isn’t your strong suit. Plus, having both tanks tucked neatly under the van keeps your interior free and your system looking tidy. It’s a bit more of an investment, but if you want something solid, well-designed, and ready to go—it’s definitely worth considering.
Wheel Arch Water Tanks (100L)
Finally, there’s the Wheel Arch Water Tank. This one’s clever because it’s shaped to fit over the wheel arch, making use of a spot that’s often wasted. It’s a win-win: you get more capacity without losing extra floor space, and the shape makes it easier to balance weight across the van.
Tips and Tricks
Insulation: If traveling in colder regions, insulate your tanks to prevent freezing.
Filters: Consider adding a water filter to your system for cleaner drinking water.
Accessibility: Ensure your tanks are accessible for cleaning and maintenance.
Legal Disposal: Always empty grey and black water tanks at designated dump stations.
Level Sensors: Keep tabs on your grey water levels with a gauge, preventing overflows and ensuring timely disposals.
DIY or Professional Install?
If you’re handy and enjoy DIY projects, installing a water tank can be a rewarding challenge using our installation guide. However, if plumbing isn’t your forte, seeking professional help ensures a leak-free and efficient system.
Final Thoughts
Water tanks might not be the most exciting part of your campervan build, but they’re undeniably crucial. With the right setup, you’ll enjoy the comforts of home on the open road. Whether you’re a weekend warrior or a full-time vanlifer, investing time and thought into your water system pays off by the bucket-load.
Happy travels and stay clean and hydrated!
Product Links
All Tanks:
Portable Water Tanks:
38 Litre Wastemaster Water Carrier
Vehicle Specific Waste and Water Tank Kits:
