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Boiler Expansion Tanks

Discover a range of expansion tanks designed to fit your specific boiler needs, ensuring optimal performance and efficiency. We proudly carry the best brands on the market including Watts and Zilmet. Our handpicked expansion tanks combine quality and affordability, ensuring that your boiler system runs smoothly.
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32 products

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 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

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

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

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

Cream-colored vertical well tank with Zilmet branding, black top fitting, and round base.

Zilmet ZHP350 105.7 Gal Vertical With Base 1-1/4'' NPT Connection Well Tank

SKU #: ZILZHP350   |   MPN #: ZHP350
$1,577.04
$1,577.04 $0.00
MSRP: $6,200.60

Special Order. Expect 4-6 weeks for delivery, subject to change

Premium Boiler for Maximum Comfort

Welcome to Plumbing Deals, your source for high-quality expansion tanks designed to enhance the efficiency and lifespan of your boiler system. We seamlessly blend affordability with top-tier quality. We carry some of the best performing names in the industry, including Watts and Zilmet. Whether you're a homeowner or a seasoned contractor, our carefully selected products are here to ensure your boiler operates at its best, without breaking the bank. Discover a range of expansion tanks designed to fit your specific boiler needs, ensuring optimal performance and efficiency.

Whether you're in the process of upgrading your existing boiler system, replacing outdated equipment, or embarking on a new project, Plumbing Deals is here to provide tailored solutions to meet your specific needs. Elevate your boiler's performance to exceptional levels with our wide array of products and expertise. Delve into our carefully curated expansion tank selection, where you can find not only quality products but also amazing deals that fit your requirements. Our goal is to ensure that your boiler operates efficiently, your comfort remains at optimal levels, and your budget stays intact. Explore our diverse categories today, and together, let's transform every heating season into a truly satisfying and efficient experience.
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