Elkhart Plastics - 26 Gallon RV Fresh Water Tank 51.5x23x6 - EPI 3847 W1579000 NSF Certified OEM

This 26-gallon RV water tank features durable, FDA-approved polyethylene construction with seamless roto-molding for a leak-proof, long-lasting design. Measuring 51.5" x 23" x 6", it resists stains, corrosion, and rust, making it ideal for RVs, horse trailers, and marine use. The tank comes blank for custom fitting installation to meet your specific needs.
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Elkhart Plastics 26 Gallon RV Fresh Water Tank - EPI 3847 / W1579000

The Elkhart Plastics EPI 3847 (W1579000) is a premium 26-gallon NSF-certified fresh water tank engineered for reliable potable water storage in RVs, travel trailers, and motorhomes. Manufactured by Elkhart Plastics, the industry's most trusted name in RV water systems since the 1960s, this tank delivers authentic OEM quality that matches or exceeds the original equipment installed by major RV manufacturers. With a low-profile 6-inch height and compact 51.5x23-inch footprint, this tank is specifically designed for space-constrained installations where every inch matters.

Measuring 51.5 inches long by 23 inches wide by just 6 inches tall, the EPI 3847 provides excellent fresh water capacity in a remarkably compact package. The 26-gallon capacity is ideal for weekend camping trips, short-term boondocking, and smaller RVs where space is at a premium. The NSF certification ensures your drinking water stays clean, safe, and free from contaminants, while the FDA-approved polyethylene construction resists cracking, warping, and UV degradation even in harsh conditions. Whether you're replacing a damaged original tank or upgrading your RV's water system, this Elkhart Plastics fresh water tank delivers the quality and reliability you need.

Why Choose the Elkhart Plastics EPI 3847 Fresh Water Tank?

NSF Certified for Potable Water Safety: This tank carries NSF certification, the gold standard for potable water storage. Unlike uncertified tanks that may leach chemicals or develop odors, the EPI 3847 is rigorously tested and certified to ensure your drinking water remains pure, safe, and free from contamination. This certification means you can trust this tank for your family's drinking water, cooking, and all household uses.

Authentic OEM Quality: Elkhart Plastics has been the go-to supplier for major RV manufacturers for over 50 years. When you choose the EPI 3847, you're getting the exact same quality tank that comes factory-installed in new RVs from leading brands—not a cheap aftermarket substitute. This is genuine OEM equipment built to the highest industry standards with proven durability.

Low-Profile Design for Tight Spaces: At only 6 inches tall with a compact 51.5x23-inch footprint, this tank fits perfectly in shallow under-floor compartments, tight storage bays, and space-constrained RV builds. The low-profile design doesn't sacrifice capacity—you still get a full 26 gallons of fresh water storage in a package that fits where standard tanks won't.

Seamless Roto-Molded Construction: Elkhart Plastics uses advanced rotational molding technology to create one-piece tanks with no seams, welds, or weak points. This manufacturing process produces uniform wall thickness throughout the entire tank, eliminating the stress concentrations and failure points common in cheaper welded tanks. The result is superior strength and leak-free performance for years.

FDA-Approved Materials: Your family's health matters. This tank is constructed from FDA-approved polyethylene that's specifically rated for potable water storage. Unlike inferior tanks that can leach chemicals or develop odors, the EPI 3847 keeps your drinking water pure and fresh, even after years of use.

Perfect for Smaller RVs and Van Conversions: The 26-gallon capacity is ideal for compact travel trailers, teardrop campers, van conversions, and smaller motorhomes. It provides adequate fresh water for weekend trips and short-term camping without taking up excessive space or adding unnecessary weight to your rig.

Technical Specifications

• Capacity: 26 gallons
• Dimensions: 51.5" L x 23" W x 6" H
• Part Numbers: EPI 3847, W1579000
• Material: FDA-approved polyethylene
• Construction: Seamless rotational molded
• Weight: 48 lbs (empty)
• Certification: NSF certified for potable water
• Color: Natural/translucent
• Manufacturer: Elkhart Plastics/Ameri-Kart
• Country of Origin: USA
• Application: RVs, travel trailers, campers, van conversions
• Barcode: 20752443
• HS Code: 392510

Perfect Applications

This 26-gallon fresh water tank is ideal for a wide range of RV and mobile applications where space efficiency is critical. It's commonly used in compact travel trailers, teardrop campers, Class B motorhomes, and van conversions where under-floor mounting space is limited. The low 6-inch height makes it perfect for shallow basement compartments, slide-out areas, and custom builds where vertical clearance is at a premium.

Many RV owners choose this tank when downsizing from larger rigs or when building custom camper conversions. The 26-gallon capacity provides adequate fresh water for 2-3 days of typical use for two people, making it ideal for weekend warriors and short-term camping adventures. It's also popular in off-grid tiny homes, mobile food trucks, and emergency water storage applications where NSF-certified potable water storage is required in a compact package.

Compare Similar 25-26 Gallon Fresh Water Tanks

Installation and Compatibility

Installing the Elkhart Plastics EPI 3847 is straightforward for anyone with basic RV maintenance skills or a qualified RV technician. Before installation, carefully measure your available mounting space to ensure proper fit—remember to account for fill connections, vent pipes, and drain fittings which will add to the overall dimensions. The tank should be securely mounted using appropriate straps or brackets to prevent movement during travel, and all connections should be sealed with proper food-grade RV plumbing fittings.

This tank works seamlessly with standard RV water pumps, fill systems, and plumbing components. For optimal performance and leak-free connections, we recommend pairing it with quality Elkhart Plastics tank fittings and accessories to ensure compatibility and long-term reliability. Always sanitize the tank thoroughly before first use following proper RV water system sanitization procedures.

Frequently Asked Questions

What does NSF certification mean? NSF certification is the gold standard for potable water storage products. It means this tank has been rigorously tested and certified by NSF International to ensure it doesn't leach harmful chemicals into your drinking water and meets strict safety standards for food-contact materials.

Will this tank fit my RV? The EPI 3847 is designed for installations where you have at least 51.5" length, 23" width, and 6" height clearance, plus additional room for fittings and connections. Measure your available space carefully to ensure proper fit.

How long will 26 gallons of water last? For two people with conservative use, 26 gallons typically provides 2-3 days of fresh water for drinking, cooking, and basic hygiene. Actual duration depends on your usage habits and whether you're using water for showers, dishwashing, and other activities.

Is this tank suitable for drinking water? Absolutely. The EPI 3847 is NSF certified and FDA-approved for potable water storage. It's specifically designed and tested for drinking water, cooking, and all household uses. The materials won't leach chemicals or develop odors that could affect water quality.

What's the difference between this and aftermarket tanks? Elkhart Plastics manufactures OEM tanks for major RV brands. This is the same quality tank that comes factory-installed in new RVs, with NSF certification, seamless construction, and proven durability—not a cheaper aftermarket imitation without proper certifications.

Can I install this myself? If you have basic RV maintenance skills and the proper tools, yes. However, ensure all connections are properly sealed with food-grade fittings and the tank is securely mounted. If you're not confident in your abilities, we recommend having a qualified RV technician perform the installation.

Why Buy From Elkhart RV Parts?

When you order the Elkhart Plastics EPI 3847 from us, you're getting more than just a fresh water tank—you're getting peace of mind and expert support. We're an authorized dealer of genuine Elkhart Plastics products, which means you receive factory-fresh inventory with full manufacturer backing and authentic NSF certification. Our team specializes exclusively in RV water systems, and we understand the critical importance of safe, reliable potable water storage for your RV lifestyle.

We offer fast, free shipping on this tank, and our expert packaging ensures it arrives in perfect condition ready for installation. Unlike big-box retailers who treat RV parts as an afterthought, we focus exclusively on RV components and understand the unique needs of RV water systems. When you need technical support, fitment verification, or installation guidance, our AI Live Chat is available to provide expert assistance with deep product knowledge.

Ready to upgrade your RV's fresh water system with NSF-certified OEM quality? Order your Elkhart Plastics EPI 3847 today and enjoy the confidence that comes with genuine factory equipment and certified potable water safety. With our fast shipping and expert support, you'll be back on the road with reliable fresh water storage in no time.