
ZEP5 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $35.99 | Condition is New other (see details), Zilmet Zep5 2.1 Gallon Expansion Tank- OPEN BOX - READ DESCRIPTION, FREE SHIPPING | ![]() |
![]() | $39.95 | Top Pick! Condition is New other (see details), Zilmet In-line thermal expansion tank 2.1 gal. 3/4" S. Steel NPT connection ZEP5, shipping cost = $15.00 | 99.7% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $25.00 | Condition is New, Zilmet ZEP5 Stainless Steel In-Line Thermal Expansion Tank 2.1 Gallon 3/4" NPT, shipping cost = $9.35 | 100.0% |
![]() | $36.54 | Top Pick! Condition is New, Zilmet Zep5 2.1 Gallon Expansion Tank- New In Box, FREE SHIPPING | 99.6% |
![]() | $25.00 | Condition is New, Zilmet Easy-Pro ZEP5 Expansion Tank 2.1 gal, White, MPN 20016, shipping cost = $18.95 | 100.0% |
![]() | $35.54 | Condition is New, Zilmet In-line thermal expansion tank 2.1 gal. 3/4" S. Steel NPT connection ZEP5, shipping cost = $9.99 | ![]() |
![]() | $52.04 | Condition is New, Zilmet ZEP5 In-Line Expansion Tank for Hot Water Heaters, FREE SHIPPING | 99.4% |
![]() | $42.50 | Condition is New, Zilmet ZEP5 2.1 gal In-line thermal expansion tank with 3/4" Connection, N W, shipping cost = $18.43 | 99.9% |
![]() | $39.99 | Condition is New, Zilmet In-line thermal expansion tank 2.1 gal. 3/4" S. Steel NPT connection ZEP5, shipping cost = $22.55 | ![]() |
![]() | $61.11 | Top Pick! Condition is New, Cornerstone ZEP5 Zilmet In-Line Thermal Expansion Tank 150 psi 2.1 gal Tank, FREE SHIPPING | ![]() |
![]() | $61.36 | Condition is New, Zilmet 2.1gal In-line thermal expansion tank with 3/4" Stainless steel NPT, FREE SHIPPING | 99.8% |
![]() | $202.84 | Condition is New, Zilmet 2.1gal thermal expansion tank w/ZAFL2234 ActiveFlo Lite Water Conditioner, FREE SHIPPING | 99.8% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $39.99 | Condition is Open box, Zilmet In-line thermal expansion tank 2.1 gal. ZEP5 3/4" Connection Thread, shipping cost = $14.99 | 98.8% |

The Zilmet ZEP5 2.1 Gal In-Line Thermal Expansion Tank is a crucial addition to any HVAC system designed to ensure optimal performance and longevity. This expansion tank, with a capacity of 2.1 gallons, is engineered to accommodate the thermal expansion and contraction of the coolant inside the system, thereby preventing damage to the system components.
Constructed from robust 3/4 steel, this expansion tank boasts exceptional durability and resistance to corrosion. Its cylindrical shape, featuring a diameter of 8 inches and a height of approximately 13 inches, makes it suitable for most standard HVAC systems. The ZEP5 model is designed specifically for in-line installation, enabling easy integration into your existing setup.
The tank's innovative design includes a transparent viewing window, allowing you to monitor the coolant level effortlessly. This feature ensures you're always aware of the tank's status and can take any necessary precautions to maintain ideal system operation.
Additionally, the Zilmet ZEP5 In-Line Thermal Expansion Tank is equipped with a pressure relief valve, which automatically releases excess pressure when necessary. This safety feature helps prevent damage to your HVAC system and ensures the overall safety of your property.
The ZEP5 expansion tank comes with a factory-installed check valve, which ensures proper circulation of the coolant. This valve prevents the coolant from flowing back into the expansion tank during system operation, thus maintaining the desired pressure inside the tank.
Lastly, the Zilmet ZEP5 In-Line Thermal Expansion Tank is easy to install, requiring no special tools or extensive plumbing knowledge. Its compact design and straightforward installation process make it an excellent choice for both DIY enthusiasts and professional technicians. With its rugged construction, convenient features, and reliable performance, the Zilmet ZEP5 2.1 Gal In-Line Thermal Expansion Tank is an indispensable component for any heating and cooling system.
Pros and Cons of Buying a Zilmet ZEP5 2.1 Gal In-Line Thermal Expansion Tank (3/4 Steel)
1. **Pros of Buying Zilmet ZEP5 2.1 Gal In-Line Thermal Expansion Tank (3/4 Steel):**a. **Size:** This thermal expansion tank has a compact design, measuring 10 inches in height and 6 inches in width, making it an excellent choice for limited spaces in heating systems.
b. **Material:** The 3/4 steel construction makes the tank durable and able to withstand high pressure and temperature conditions in heating systems.
c. **Design:** The in-line design allows for easy installation, as it can be connected directly to the heating system without the need for additional piping or manifolds.
d. **Capacity:** With a capacity of 2.1 gallons, this thermal expansion tank is suitable for small to medium-sized heating systems.
e. **Air Elimination:** The ZEP5 model features an automatic air vent, which helps prevent air from entering the heating system, ensuring better performance and reducing the risk of damage.
2. **Cons of Buying Zilmet ZEP5 2.1 Gal In-Line Thermal Expansion Tank (3/4 Steel):**a. **Capacity:** Although suitable for small to medium-sized heating systems, the 2.1-gallon capacity may not be sufficient for larger systems, requiring the installation of multiple expansion tanks.
b. **Price:** Compared to some other expansion tanks in the market, the Zilmet ZEP5 may be pricier due to its high-quality steel construction and advanced features.
3. **Conclusion:**The Zilmet ZEP5 2.1 Gal In-Line Thermal Expansion Tank (3/4 Steel) offers several advantages, including its compact size, durable steel construction, in-line design, automatic air vent, and suitable capacity for small to medium-sized heating systems. However, its relatively higher price point and limited capacity may be potential drawbacks for some consumers. Ultimately, the decision to purchase this expansion tank depends on the specific requirements of your heating system and budget.
4. **Recommendation:**If you have a small to medium-sized heating system and are looking for a high-quality, durable, and easy-to-install thermal expansion tank, the Zilmet ZEP5 2.1 Gal In-Line Thermal Expansion Tank (3/4 Steel) is an excellent choice. However, if you have a larger heating system or are on a tight budget, you may want to consider alternative options with higher capacities or lower prices. Always make sure to consult with a professional plumber or heating technician to determine the best expansion tank for your specific heating system.
Details:
Over 2 million square feet of production space. Advantages: Zilmet has over 50 years of experience in manufacturing high quality diaphragm expansion tanks. 150 psi max pressure rating. Technical features: all tanks are nsf61 certified.
Protected pre charge valve eliminates potential leak path. There are no bubbles or corners to trap sediment, inhibiting bacterial growth. Exclusive polypropylene liner eliminates internal corrosion. Zilmet has created a compact design with seamless diaphragm that never stretches or creases.
Fully vertically integrated, designing and manufacturing all diaphragms internally. Zilmet easy-pro in-line thermal expansion tanks: tanks for hot water heaters: prevent dangerous pressure build up. External baked epoxy-polyester coating provides a durable appliance like finish. MiG welding eliminated interior rough spots and sharp edges.
Each tank is factory leak tested to ensure integrity. Save energy and water. Protect household appliances and fixtures.
specifications maxohvac:
- brand: Zilmet
- mpn: Zep5
- part type: Expansion Tank
- upc: 019855041337
shipping maxohvac:
- service: standard
- type: fixed
- class: standard
- transit: 3-8 days
general maxohvac:
- category: Business & Industrial > Hvac Refrigeration
offer maxohvac:
- prices: $25.00–$202.84
- item condition:
- New other (see details)
- New
- Open box
- sold #: 18
- options: ship-to-home
- in stock #: 5
- availability: in stock
- started: february 24, 2025
seller maxohvac:
- city: walled lake, michigan
- # reviews: 13030
- rating: 99.0%
payments maxohvac:
- credit card: diners-club
- wallet: paypal
- other
returns maxohvac:
- time: 30 days
- paid by: buyer
- method: money back
- policy: returns accepted













