Answer: For reliable grey water storage and disposal in an RV, these five tanks offer varied capacities, ease of installation, and durable construction. The best pick depends on RV size, willingness to install a fixed tank, and whether portability or permanence matters. The top options below cover portable tote tanks and fixed holding tanks to fit most travel styles. A quick comparison table is included to help you choose fast.
| Product | Type | Capacity | Best For |
|---|---|---|---|
| Camco Rhino Tote Tank | Portable Tote | 28 Gallons | Owners needing portable disposal from remote spots |
| classAcustoms 24394 Grey Water Tank | Fixed Tank | 13 Gallons | Compact, U.S.-made grey water storage |
| Custom Roto-Molding H85 | Fixed Tank | 50 Gallons | Large-capacity, rugged holding solution |
| RecPro 50 Gallon Holding Tank | Fixed Tank | 48.5 Gallons | Custom fit for select RV layouts |
| classAcustoms WT-3232 | Fixed Tank | 32 Gallons | Mid-size grey water storage |
Camco Rhino 28-Gallon Tote Tank
This portable tote tank is designed for easy waste transfer from an RV black water tank to a dump station. It’s best for travelers with limited hose reach or those parked far from dump facilities. The unit features large, heavy-duty, non-flat wheels and a built-in gate valve, plus a steel tow adapter for towing behind a vehicle. It weighs about 43 lb with dimensions that balance capacity and portability. Choose this if you want a moveable option for occasional dumping scenarios.
Best for: RV owners who need a portable solution to extend reach to dump stations. Better for: occasional use when a fixed tank isn’t feasible. Caution: The tote tank is heavy when full; plan for safe handling and disposal.
classAcustoms 24394 RV Grey Water Tank
This 32-inch long grey water tank is built for storage in RVs, trailers, and tiny houses. It’s made in the USA from MDPE resin and is specifically labeled for grey water use only. It includes an installed outlet but requires you to place inlet and vent positions, with hardware not included. This tank is best for RVers looking for a US-made, purpose-built grey water container with straightforward installation planning. Limitation: inlet and vent placement are user-determined, and fittings may require additional hardware.
Best for: Those who want a dedicated grey water solution with a U.S.-made build. Better for: owners comfortable planning inlet/vent locations. Caution: Not a plug-and-play unit; you will determine installation points.
Custom Roto-Molding H85 RV Holding Tank
The H85 model provides a 50-gallon holding tank suitable for larger RV setups. It’s designed for durable waste storage with a fixed installation in mind. Best for: RV owners who want a high-capacity, long-term grey water solution integrated into the vehicle. Better for: heavy-duty use and longer trips where frequent dumping is impractical. Caution: Requires proper installation and compatible plumbing—data notes not included.
RecPro 50 Gallon RV Holding Tank
RecPro’s 50-gallon holding tank emphasizes precise fit with common RV dimensions and a sturdy polyethylene construction. It measures 53″ x 27″ x 10 1/2″ and is designed to integrate with a dedicated installation kit for easier DIY setup. Best for: RV owners seeking a robust, mid-to-large capacity tank with a straightforward installation path. Better for: those who value exact dimensions that align with popular RV models. Caution: Actual capacity includes a margin and may vary slightly by model compatibility and installation method.
classAcustoms WT-3232 32 Gallon Grey Water Tank
This 32-gallon grey water tank from Class A Customs is a fixed tank suited for mid-size RVs. It uses MDPE resin and is intended for waste/grey water use only. The unit features an installed 1.5″ ABS outlet and requires the user to determine inlet and vent positions with hardware not included. Best for: mid-range capacity storage with a US-built confidence. Better for: RVs needing a balanced footprint without excessive height or length. Caution: Inlet and vent placement are user-determined and may require additional piping and fittings.
Buying Guide: Key Considerations for RV Grey Water Tanks
- Fixed vs portable: Choose a fixed tank for permanent RV plumbing or a portable tote for flexibility and occasional dumping in remote locations.
- Capacity needs: Larger RVs typically require 30–50+ gallon tanks, while smaller units may manage with 13–28 gallons. Match capacity to your travel frequency and dump accessibility.
- Material and durability: MDPE resin tanks resist UV exposure and outdoor conditions. HDPE variants are common and durable for both fixed and portable options.
- Outlets and fittings: Check outlet sizes (1.5″ or 3″ ABS) and plan for compatible piping. Hardware may be sold separately for installation.
- Ventilation: Some tanks require venting; ensure you have a plan to vent properly to avoid pressure buildup and odors.
- Installation ease: DIY-friendly tanks often include installation kits or fit-ready dimensions. Professional installation may be required for larger units.
- Maintenance and odor control: Consider products that support easy cleaning and odor management; some brands offer additional treatment options.
FAQ
- What is the difference between grey water and black water tanks? Grey water tanks store rinse water from sinks and showers, while black water tanks store waste from toilets. Some products are designed specifically for grey water only.
- Can I install a fixed grey water tank myself? Yes, if you have basic plumbing skills and follow manufacturer guidelines, though some installations may require professional assistance.
- Are portable tote tanks suitable for long trips? They are ideal for flexible, short-to-medium trips or when dumping stations are far away, but require manual transport when full.
- Do grey water tanks require venting? Some models require venting to allow air flow during waste storage; check the specific installation instructions for vent requirements.
- What maintenance helps prevent odors? Regular flushing, proper seal maintenance, and using approved tank treatments can reduce odors and maintain flow.
- Do all tanks fit all RV models? Not all tanks fit every RV. Check exact dimensions and compatibility with your RV’s frame and plumbing layout.