2.1 Gal. Inline Expansion Tank, Residential
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Free delivery from $99
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Zilmet ZEP5 Inline Thermal Expansion Tank – 2.1 Gallon, 3/4″ NPT, NSF Certified
The Zilmet ZEP5 is a 2.1-gallon inline thermal expansion tank engineered for use in potable water systems subject to thermal expansion from heating. Designed for closed-loop systems, it helps regulate pressure by absorbing excess water volume caused by temperature increases, preventing overpressurization of the plumbing system.
The tank features a welded steel shell with a seamless polypropylene liner and a high-grade butyl diaphragm, creating a separation between system water and the air charge. Its MIG-welded construction eliminates internal sharp edges, improving reliability and extending service life.
Product Features
- Capacity: 2.1 gallons (8 liters)
- Pre-Charge: Factory set; adjustable as required
- Construction: Welded steel tank with durable epoxy-polyester finish
- Liner Material: Virgin polypropylene, bonded to interior surface to resist cracking and delamination
- Diaphragm: Butyl rubber; low permeability for reduced air loss
- Connection: 3/4″ NPT stainless steel female threaded fitting
- Mounting Orientation: Inline/horizontal installation
Performance Ratings
- Maximum Working Pressure: 150 PSI
- Maximum Temperature: 200°F (93°C)
- Diameter: 7.9 inches
- Height: 11 inches
- Certification: NSF/ANSI 61 compliant for potable water applications
- Warranty: 5 years (manufacturer limited)
Installation Notes
The ZEP5 is intended for installation on the cold-water supply line, downstream of the backflow prevention device or pressure-reducing valve. System pressure and tank pre-charge should be matched prior to final connection. Installation should be performed by qualified personnel in accordance with local plumbing codes and pressure system design criteria.
Recommended Applications
Designed for residential and light commercial water heating systems requiring expansion control. Suitable for use with standard and high-efficiency water heaters in closed systems where thermal expansion can result in elevated pressure and potential system stress.
Fast, Reliable Delivery for Every Order
At Primes Distribution, we understand that timely delivery is just as important as product quality. That’s why we partner with trusted carriers to make sure your plumbing, HVAC, and heating supplies arrive safely and on time.
Shipping Methods
We offer multiple shipping options to fit your needs:
Standard Shipping: 3–7 business days across the continental U.S.
Expedited Shipping: 1–3 business days for urgent orders.
Local Pickup: Available at our warehouse by appointment.
Order Processing
All in-stock orders are processed within 1–2 business days. You’ll receive a confirmation email once your order is placed and a tracking number as soon as it ships.
Orders placed after 3 PM or on weekends will be processed the next business day.
Shipping Costs
Shipping costs are calculated at checkout based on weight, dimensions, and delivery location. Large or heavy items (like water heaters or HVAC units) may require special freight handling.
Delivery Areas
We currently deliver throughout the United States. For bulk or international shipments, please contact our support team for a custom quote.
Damaged or Missing Items
If your shipment arrives damaged or incomplete, report it within 48 hours of delivery. Our support team will quickly arrange a replacement or refund.
Need Help?
If you have questions about your order or need help tracking a shipment, reach out to our customer support team at:
📧 sales@primesdistribution.com
📞 786-937-7081
