4.4 Gal. Hydronic Heating Expansion Tank
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Zilmet ZHT18-30 Hydronic Expansion Tank – 4.4 Gallon, 1/2″ NPT, 60 PSI Max
The Zilmet ZHT18-30 is a diaphragm-type hydronic expansion tank engineered for closed-loop hot water heating systems. With a 4.4-gallon total capacity, this model is designed to absorb excess pressure caused by thermal expansion, maintaining system stability and extending component life.
This unit features a carbon steel shell with a baked epoxy-polyester coating and a certified synthetic rubber diaphragm. Its side-mounted 1/2″ NPT connection and compact dimensions allow for integration into wall-mounted or floor-mounted hydronic systems with space constraints.
Key Product Features
- Total Volume: 4.4 gallons (16.5 liters)
- Construction: Welded carbon steel with corrosion-resistant external coating
- Diaphragm: Butyl rubber, replaceable, designed for optimal pressure separation
- Connection: 1/2″ NPT female thread (side-mounted)
- Factory Pre-Charge: 12 psi (adjustable to match system requirements)
Performance Specifications
- Maximum Working Pressure: 60 psi
- Maximum Temperature: 230°F (110°C)
- Diameter: 11.4 inches
- Height: 14.8 inches
- Certifications: CE and NSF/ANSI 61 compliant
- Warranty: 5-year limited (manufacturer)
Installation Notes
The ZHT18-30 is intended for installation in closed-loop hydronic heating systems. Mounting should allow access to the air valve for pressure adjustment. System pressure must be checked and matched prior to final connection. Installation must conform to applicable plumbing and mechanical codes and should be completed by qualified personnel.
Recommended Applications
Suitable for residential and light commercial hot water boiler systems requiring pressure stabilization. Compatible with wall-hung boilers, baseboard systems, and radiant floor heating loops where expansion volume control is needed to prevent overpressurization.
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
