RV Tanks
RV Fresh Water Tanks
Fresh Water RV Tanks Listed by Capacity and Dimensions
RV water tanks from Water Storage Tank keep fresh water flowing wherever your rig goes, whether you’re outfitting a new coach, replacing a cracked OEM tank, or fitting out a van conversion. Each RV fresh water tank is rotomolded from potable-grade polyethylene, and our stock RV water tanks are listed by capacity and outer dimensions, so you can pick one that fits your footprint and plumbing. We work with RV manufacturers, repair shops, and serious DIY builders to deliver durable, leak-resistant RV water tanks that install cleanly and perform for years on the road.
Looking for water storage solutions? We can help! Call us at 1-863-261-8388 or contact us to discuss your needs.
Why Choose a Rotomolded RV Fresh Water Tank?
With hundreds of stock sizes to choose from, you can often keep the footprint you need without compromising capacity or plumbing layout. Whether you’re replacing a failed OEM RV fresh water tank or planning a new build, our tanks are engineered for long-term service in real road conditions.
- Built for RV duty: Rotomolded polyethylene RV water tanks resist cracking, vibration, and road shock.
- Potable water safe: FDA-compliant resin helps protect drinking water quality when used as directed.
- Spin-welded fittings: Inlets, outlets, vents, and drains come spin-welded in set positions; pick a model whose fittings line up with your plumbing to reduce field work.
- Easy replacement: Match the general size of an existing RV fresh water tank while improving material and design.
- Support from spec to install: Our team reviews dimensions, fittings, and use conditions before you buy.
How to Choose a Stock RV Water Tank
To choose a new or replacement RV fresh water tank, gather a few key details first. Having these ready up front makes it quick to narrow the stock models down to the ones that fit.
- Overall dimensions: Length, width, and height of the available space, plus orientation (which side faces forward).
- Target capacity: Desired gallons, or “match existing tank” if you’re replacing one.
- Fitting locations: Approximate locations and sizes for fill, outlet, vent, drain, and any inspection ports.
- Use type: Fresh potable water (this page) vs. gray/black water (see our RV holding tanks page).
- Reference info: Any OEM part numbers, sketches, photos of the existing RV water tank, or plumbing layout.
Then compare those details with the stock models in RV Water Tanks, which are listed by capacity and outer dimensions.
Example RV Water Tank Sizes
Every RV build is different, but these example fresh water tank sizes show the range we commonly supply. Our stock models run from 3 to 260 gallons, including Custom Roto-Molding and Trionic tanks. Use them as a starting point when planning your layout, then pick the stock model whose outer dimensions and capacity fit your space.
| Example Application | Approximate Capacity (Gallons) | Example Stock Models | Notes |
|---|---|---|---|
| Small camper / van conversion | 20–30 gal | Custom Roto-Molding W-368 (20 gal), Trionic WH-2025 (25 gal) | Compact RV water tank for basic kitchen and handwashing. |
| Mid-size travel trailer | 35–55 gal | Custom Roto-Molding W-1 (40 gal), Trionic WH-2050 (50 gal) | Common replacement RV fresh water tank size for couples’ coaches. |
| Large fifth wheel / motorhome | 70–100+ gal | Custom Roto-Molding W-101 (100 gal), Trionic WH-2080 (80 gal) | Higher-capacity potable water storage for extended off-grid stays. |
| Toy hauler / specialty build | As required | Match the available bay | Choose a stock shape that works around your cargo, axles, and weight distribution. |
Who Uses Our RV Water Tanks?
RV Manufacturers & Upfitters
OEM builders and upfitters can often fit one stock RV fresh water tank across a whole line. When standard off-the-shelf tanks don’t fit the available space, a production run of 4 or more identical tanks gives you repeatable tanks for production lines, with port locations that match your plumbing drawings. You buy the mold, so re-orders match the first run.
RV Repair Shops & Service Centers
Cracked or leaking RV water storage tanks are a common repair. We supply replacement RV water tanks that match the general size and function of the original, often in stronger polyethylene with upgraded fittings to reduce callbacks.
Van, Skoolie & Tiny Home Builders
Conversion builders need potable water storage that fits tight, odd spaces—over wheel wells, under beds, or in cabinetry. Comparing stock RV tanks by outer dimensions lets you maximize gallons while keeping weight and access where they make sense for your layout.
Serious DIY RV Owners
If you’re re-plumbing an older rig, adding boondocking capacity, or building your own adventure vehicle, the wide range of stock RV water tanks gives you the flexibility to design your system once and avoid future headaches.
Do you have questions? We can help! Call us at 1-863-270-8118 or contact us to discuss your needs.
Engineering Details & Materials
Behind every RV water tank is a set of engineering decisions that affect long-term performance. Each stock tank is designed with materials and wall thickness appropriate for RV use so you don’t have to guess.
- Material: Rotomolded HDPE polyethylene, suitable for fresh potable water when used as directed.
- Construction: Seamless, one-piece design reduces risk of leaks at seams or joints.
- Wall thickness: Selected for RV service to balance strength, weight, and cost.
- Fittings: Spin-welded or bulkhead fittings installed at the factory for inlets, outlets, vents, and drains.
- Temperature range: Designed for typical RV operating temperatures; optional insulation strategies available at the system level.
- Compatibility: Works with standard RV pumps, filters, and plumbing when sized and installed correctly.
Need gray or black water storage as well? Pair your fresh water tank with a matching RV holding tank built from the same durable materials.
RV Water Tank FAQs
Can I find a tank to match my existing RV fresh water tank?
In many cases, yes. Match your existing tank’s capacity, outer dimensions, and fitting positions against the stock models in RV Water Tanks. Measurements and any visible part numbers help you compare. Check clearances, fittings, and support points before you order to avoid surprises during install. RV manufacturers and fleets that need 4 or more identical tanks of a shape the stock models don’t cover can order a production run.
Are your RV water tanks safe for drinking water?
Our RV fresh water tanks are manufactured from potable-grade polyethylene resin that meets FDA/NSF requirements for contact with drinking water when used as directed. Always follow best practices for sanitizing and maintaining your RV water system.
Do you also carry gray and black RV holding tanks?
Yes. In addition to fresh water tanks, we carry gray water and black water RV holding tanks with appropriate fittings and venting, including end dump, side dump, and L-shaped models. Browse RV Holding Tanks to compare them by capacity and outer dimensions.
What should I measure before choosing an RV tank?
At minimum, know your target capacity, available space (L × W × H), tank orientation, and where fittings need to sit. If you’re replacing an OEM tank, measurements and photos of the old tank and plumbing make it quicker to find the stock model that matches.
Can I drill new holes or move fittings after I receive the tank?
We strongly recommend having fittings installed at the factory to maintain structural integrity and leak resistance. If you must add fittings in the field, use components designed for polyethylene and follow the manufacturer’s installation instructions carefully.
How do I check clearances before I order?
Compare each stock model’s listed outer dimensions with your space, leaving room for fittings, hoses, and straps. Then review clearances with your team to avoid conflicts with frames, axles, and other components.
Can these RV water tanks be used in off-grid cabins or tiny homes?
Yes. Many customers use our RV-style potable water tanks in cabins, tiny homes, and mobile offices where space is limited and RV plumbing components are already in use. Let us know your installation details so we can recommend a suitable configuration.
Looking for water storage solutions? We can help! Call us at 1-863-261-8388 or contact us to discuss your needs.
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