Finding a reliable 25 gallon grey water tank for RVs, campers, or tiny homes involves assessing material quality, fittings, and mounting options. The following picks come from classAcustoms and similar lines, offering durable MDPE resin, NSF-approved materials, and configurations designed for fresh, gray, or waste water. This guide highlights five relevant products, compares their features, and provides practical buying considerations to help you choose confidently.
| Product | Brand | Capacity | Type | Notes |
|---|---|---|---|---|
| T-2500 | One (1) RV Fresh Water 25 Gallon Tank | classAcustoms | 25 Gallon | Fresh/Gray Water Tank | NSF approved; built-in fittings; can sit on any side |
| RV Fresh and Gray Water Tank Combo Pack | classAcustoms | 20 & 25 Gallon | Combo Pack | NSF certified MDPE; two sizes |
| T-2500-BPK | 25 Gallon Fresh and Gray Water Tank With Plumbing Kit | classAcustoms | 25 Gallon | Fresh/Gray Water Tank + Kit | Includes plumbing components; same dimensions |
| UM-2500 Under Mount 25 Gallon RV Concession Tank | classAcustoms | 25 Gallon | Fresh/Gray Water Tank | Under-mount design; multiple orientation options |
| WT-2525 3″ Black Water RV Waste Tank | classAcustoms | 25 Gallon | Waste/Gray Water Tank | For waste/gray water; not for drinking water |
Note: All products described are designed for gray or waste water storage in RVs and similar setups. Ensure your chosen model fits your mounting space, inlet/outlet fittings, and local regulations on tank materials and venting.
T-2500 One 25 Gallon RV Fresh Water Tank
Overview: This 25 gallon tank is suitable for fresh or gray water storage. It’s made from NSF-approved materials and is designed with versatility in mind. The tank can sit on any side and rotate to adjust height or width, facilitating space-constrained installs. Built-in fittings include two 1.5″ female NPT connections and two additional 0.5″ NPT fittings, with guidance to avoid over-tightening. The average wall thickness is about 7/32″. The product emphasizes safety for drinking water use and compatibility with various plumbing configurations.
RV Fresh and Gray Water Tank Combo Pack
This combo pack includes 20 gallon and 25 gallon tanks, both NSF-certified MDPE resin with UV stabilization. Each tank features two 1/2″ female NPT fittings and two 1 1/2″ female NPT fittings, where the fittings are initially closed and require membrane removal for use. The dual-pack offers flexibility for customers needing different capacities within the same system, aiding in tiered water storage solutions and modular RV plumbing configurations.
T-2500-BPK 25 Gallon Tank With Plumbing Kit
Overview: This product combines the classic 25 gallon fresh/gray water tank with a plumbing kit. It shares the same dimensions as other T-2500 models and offers built-in fittings that are designed to be watertight when the membrane is correctly removed. It features two 1.5″ FPT fittings and two 0.5″ NPT fittings. The kit-oriented presentation aims to streamline installation, especially for RVs needing a ready-to-connect solution for water storage or gray water containment.
UM-2500 Under Mount 25 Gallon Tank
The UM-2500 provides an under-mount installation option for a 25 gallon fresh/gray water tank. It supports rotation to accommodate orientation changes, and like other classAcustoms models, uses NSF-approved materials. The stated dimensions are 38″ long by 8.5″ wide by 20.5″ tall, giving a compact footprint with flexibility for side or top mounting in compact RVs, campers, or tiny homes. Built-in fittings consist of two 1.5″ FPT outlets and two 0.5″ FPT ports, with cautions on tightening to protect threads.
WT-2525 3″ Black Water Tank
Purpose-built for waste and gray water, the WT-2525 is designed for RV use with a 25 gallon capacity. It clarifies that this tank is not suitable for fresh or drinking water, emphasizing safe handling of waste containment in an RV plumbing system. The design integrates standard outlets and ports for dump valves and piping, while advising proper venting and avoiding pressurization to prevent damage. This option is suitable for users focusing on black or gray water management rather than potable water storage.
Buying Guide: Key Purchase Considerations
- Material and safety: Look for NSF or NSF/ANSI approvals and MDPE resin for durability and safe storage of non-potable water. Verify that the tank is marked as suitable for gray water, fresh water, or waste water, depending on your application.
- Fittings and compatibility: Check the number and size of built-in fittings (common: two 1.5″ FPT and two 0.5″ FPT). Confirm whether you need closed or open fittings, and whether you require a membrane removal process for operation.
- Mounting orientation: Consider whether an under-mount, top-mill, or side-mount design fits your vehicle or structure. Ensure the dimensions align with space constraints and access for maintenance.
- Dimensions and capacity: Confirm the tank’s length, width, height, and overall thickness to ensure it fits in the available space. Note that some dimensions may vary slightly due to manufacturing tolerances.
- Kit inclusions: Some models come with plumbing kits or assembly hardware. If you need a ready-to-connect solution, consider the bundled options like the T-2500-BPK.
- Maintenance and care: For potable systems, ensure safe handling and that the tank is free of materials that could leach contaminants. For waste tanks, verify venting requirements and dump valve compatibility (valves may be sold separately).
- Warranty and support: Check for manufacturer warranties and customer support options to resolve fittings or compatibility issues post-purchase.
When choosing among these options, prioritize compatibility with your RV or tiny home’s plumbing layout, whether you need fresh drinking water storage or gray/waste water containment, and how easily you can access and service the tank. Each model offers a balance of capacity, mounting flexibility, and built-in fittings designed for reliable water management on wheels or in compact living spaces.