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Expansion Tanks

Upgrade your system with our top-of-the-line expansion tanks, built to ensure maximum efficiency and long-lasting performance for your water heater. Whether you're dealing with a thermal expansion tank, a pressure tank, or a bladder tank, we've got you covered with reliable solutions tailored to meet your specific needs.
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54 products

Zilmet stainless steel expansion tank with Zilmet logo and top valve connection, cylindrical shape.

Zilmet ZS18 Stainless steel expansion tank

SKU #: ZILZS18   |   MPN #: ZS18
$476.69
$476.69 $0.00
MSRP: $989.50

Available in stock

Zilmet ZEP5 thermal expansion tank, cream-colored cylindrical vessel with logo and connection port.

Zilmet ZEP5 2.1 gal In-line thermal expansion tank with 3/4" Stainless steel NPT connection

SKU #: ZILZEP5   |   MPN #: ZEP5
$57.71
$57.71 $0.00
MSRP: $302.40

Available in stock

Stainless steel cylindrical expansion tank with Zilmet logo and valve fitting on top, black threaded connection at bottom.

Zilmet ZS8 Inox Pro ZS8 Expansion Tank, 2.1 Gal Capacity, 3/4 in Connection, NPT Connection, 304 Stainless Steel

SKU #: ZILZS8   |   MPN #: ZS8
$257.56
$257.56 $0.00
MSRP: $517.06

Special Order. Expect 4-6 weeks for Delivery. Subject to Change

Gray flat round hydronic expansion tank with Zilmet logo and brass top connection fitting.

Zilmet ZFT18C 4.8 gal flat round hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded bracket

SKU #: ZILZFT18C   |   MPN #: ZFT18C
$121.97
$121.97 $0.00
MSRP: $279.48

Available in stock

Zilmet gray rectangular hydronic expansion tank with brass connection fitting and welded mounting bracket.

Zilmet ZFT24R 6.3 gal flat rectangular hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded bracket

SKU #: ZILZFT24R   |   MPN #: ZFT24R
$236.83
$236.83 $0.00
MSRP: $588.50

Available in stock

Zilmet flat rectangular metal hydronic expansion tank with brass connection fitting and logo on front.

Zilmet ZFT8R 2.1 gal flat rectangular hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded bracket

SKU #: ZILZFT8R   |   MPN #: ZFT8R
$133.26
$133.26 $0.00
MSRP: $282.74

Available in stock

Gray flat round hydronic expansion tank with Zilmet logo and brass connection port at top.

Zilmet ZFT8C 2.1 gal flat round hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded bracket

SKU #: ZILZFT8C   |   MPN #: ZFT8C
$110.28
$110.28 $0.00
MSRP: $243.58

Available in stock

Silver rectangular hydronic expansion tank with brass connection fitting and Zilmet logo on front.

Zilmet ZFT18R 4.8 gal flat rectangular hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded bracket

SKU #: ZILZFT18R   |   MPN #: ZFT18R
$181.80
$181.80 $0.00
MSRP: $462.67

Available in stock

Zilmet ZEP1 expansion tank with stainless steel body, black valve cap, and threaded male connection at base.

Zilmet ZEP1 Expansion Tank and Shock Arrester, Butyl/304 Stainless Steel, MNPT Connection

SKU #: ZILZEP1   |   MPN #: ZEP1
$46.99
$46.99 $0.00
MSRP: $256

Available in stock

Gray cylindrical hydronic expansion tank with Zilmet logo and connection ports on top and bottom.

Zilmet ZHT8-15 2.1 Gal Cal Pro ZHT8-15 Hydronic Expansion Tank, 1/2 in Connection, NPT Connection, Carbon Steel, Gray

SKU #: ZILZHT815   |   MPN #: ZHT8-15
$68.30
$68.30 $0.00
MSRP: $142.88

Available in stock

Gray cylindrical hydronic expansion tank with Zilmet logo and rounded top, featuring small connection ports.

Zilmet ZHT18-30 4.8 Gal Capacity Cal Pro ZHT18-30 Hydronic Expansion Tank, 1/2 in Connection, NPT Connection, Carbon Steel

SKU #: ZILZHT1830   |   MPN #: ZHT18-30
$87.41
$87.41 $0.00
MSRP: $178.61

Available in stock

Gray cylindrical hydronic expansion tank with Zilmet logo and 1/2 inch connection port.

Zilmet 6.3 Gal Pro Hydronic Expansion Tank 1/2 in

SKU #: ZILZHT2460   |   MPN #: ZHT24-60
$140.70
$140.70 $0.00
MSRP: $327.20

Available in stock

Cream-colored cylindrical thermal expansion tank with Zilmet logo and metal threaded connection on top.

Zilmet ZEP12 4.8 gal In-line thermal expansion tank with 3/4" Stainless steel NPT connection

SKU #: ZILZEP12   |   MPN #: ZEP12
$80.03
$80.03 $0.00
MSRP: $384.40

Available in stock

Zilmet thermal expansion tank in almond color with red and blue logo, cylindrical shape with black valve on top.

Zilmet ZHP250 52.8 Gal Hydro-Plus Thermal Expansion Tank, 1-1/4 in Connection, Carbon Steel, Epoxy, Almond

SKU #: ZILZHP250   |   MPN #: ZHP250
$978.69
$978.69 $0.00
MSRP: $3,379.39

Special Order. Expect 4-6 weeks for Delivery. Subject to Change

Gray cylindrical hydronic expansion tank with Zilmet brand logo and rounded top.

Zilmet ZHT250 66 Gal Hydronic Tank 3/4'' NPT Connection

SKU #: ZILZHT250   |   MPN #: ZHT250
$1,082.72
$1,082.72 $0.00
MSRP: $1,972.46

Special Order. Expect 4-6 weeks for Delivery. Subject to Change

Zilmet gray cylindrical hydronic expansion tank with domed top and Zilmet logo.

Zilmet ZHT700 184.9 Gal Hydronic Tank 1'' NPT Connection

SKU #: ZILZHT700   |   MPN #: ZHT700
$2,882.33
$2,882.33 $0.00
MSRP: $6,800.15

Special Order. Expect 4-6 weeks for Delivery. Subject to Change

Gray cylindrical hydronic expansion tank with Zilmet logo and rounded top on base.

Zilmet ZHT400 105.7 Gal Hydronic Tank 3/4'' NPT Connection

SKU #: ZILZHT400   |   MPN #: ZHT400
$1,712.37
$1,712.37 $0.00
MSRP: $3,475.89

Special Order. Expect 4-6 weeks for Delivery. Subject to Change

Gray cylindrical hydronic expansion tank with Zilmet logo and rounded top section.

Zilmet ZHT600 158.5 Gal Hydronic Tank 1'' NPT Connection

SKU #: ZILZHT600   |   MPN #: ZHT600
$2,320.44
$2,320.44 $0.00
MSRP: $5,096.20

Special Order. Expect 4-6 weeks for Delivery. Subject to Change

Gray cylindrical hydronic expansion tank with Zilmet logo and rounded top.

Zilmet ZHT500 132.1 Gal Hydronic Tank 1'' NPT Connection

SKU #: ZILZHT500   |   MPN #: ZHT500
$2,107.35
$2,107.35 $0.00
MSRP: $4,383.98

Special Order. Expect 4-6 weeks for Delivery. Subject to Change

Gray cylindrical hydronic expansion tank with Zilmet logo and rounded top on dark base.

Zilmet ZHT300 79.3 Gal Hydronic Tank 3/4'' NPT Connection

SKU #: ZILZHT300   |   MPN #: ZHT300
$1,332.90
$1,332.90 $0.00
MSRP: $2,523.42

Special Order. Expect 4-6 weeks for Delivery. Subject to Change

Maximize Water Heater Efficiency with Expansion Tanks

Did you know that adding an expansion tank to your water heater system can significantly improve its efficiency and extend its lifespan? When water heats up, it expands, creating extra pressure in your plumbing system.

Without the right solution, this pressure can strain your pipes, fixtures, and even your water heater itself. That’s where a thermal expansion tank or pressure tank comes in. These tanks absorb the excess water pressure, protecting your system and ensuring smoother operation. At Plumbing Deals, we offer a carefully curated selection of hydronic, bladder tank, vertical, horizontal, and floor-mounted tanks, tailored to meet a variety of system needs.

The Right Expansion Tank for Every Water Heater System

Choosing the right expansion tank isn’t just about compatibility—it’s about optimizing performance and comfort. For example, a bladder tank is ideal for systems that need precise pressure control, while hydronic and thermal expansion tanks are perfect for managing temperature changes in your water heating system.

Our range includes vertical, horizontal, and floor-mounted tanks, providing options that fit seamlessly into any setup. By investing in the right tank, you not only protect your water heater but also enhance energy efficiency, which can save you money in the long run.
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