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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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33 products

Zilmet ZS18 Stainless steel expansion tank

Zilmet ZS18 Stainless steel expansion tank

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

Available in stock

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

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

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

SKU #: ZILZEP5   |   MPN #: ZEP5
$63.80
$63.80 $0.00
MSRP: $302.40

Available in stock

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

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

Zilmet 6.3 Gal Pro Hydronic Expansion Tank 1/2 in

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

Zilmet ZEP18 6.3 Gal Easy Pro Thermal Expansion Tank, 3/4 in Connection, NPT Connection, Carbon Steel, Almond

Zilmet ZEP18 6.3 Gal Easy Pro Thermal Expansion Tank, 3/4 in Connection, NPT Connection, Carbon Steel, Almond

SKU #: ZILZEP18   |   MPN #: ZEP18
$121.81
$121.81 $0.00
MSRP: $564.48

Available in stock

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

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

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

Zilmet ZFT24R 6.3 gal flat rectangular hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded 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 ZS8 Inox Pro ZS8 Expansion Tank, 2.1 Gal Capacity, 3/4 in Connection, NPT Connection, 304 Stainless Steel

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

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

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

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

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

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 ZEP18 6.3 Gal Easy Pro Thermal Expansion Tank, 3/4 in Connection, NPT Connection, Carbon Steel, Almond - 2 pack

Zilmet ZEP18 6.3 Gal Easy Pro Thermal Expansion Tank, 3/4 in Connection, NPT Connection, Carbon Steel, Almond - 2 pack

SKU #: ZILZEP18x2   |   MPN #: ZEP18
$405.32
$405.32 $0.00
MSRP: $2,257.92

Available in stock

Zilmet ZHT8-15 2.1 Gal Cal Pro ZHT8-15 Hydronic Expansion Tank, 1/2 in Connection, NPT Connection, Carbon Steel, Gray Zilmet ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo

Zilmet ZHT8-15 2.1 Gal Cal Pro ZHT8-15 Hydronic Expansion Tank, 1/2 in Connection, NPT Connection, Carbon Steel, Gray Zilmet ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo

SKU #: ZILZHT815ZILZAF012MF   |   MPN #: ZHT8-15 & ZAF012MF
$206.00
$206.00 $0.00
MSRP: $1,053.86

Available in stock

Zilmet ZFT8R 2.1 gal flat rectangular hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded bracket Zilmet ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo

Zilmet ZFT8R 2.1 gal flat rectangular hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded bracket Zilmet ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo

SKU #: ZILZFT8RZILZAF012MF   |   MPN #: ZFT8R & ZAF012MF
$269.64
$269.64 $0.00
MSRP: $1,193.72

Available in stock

Zilmet ZFT24R 6.3 gal flat rectangular hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded bracket Zilmet ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo

Zilmet ZFT24R 6.3 gal flat rectangular hydronic tank with 1/2" NPT connection, union (two-way check valve), and welded bracket Zilmet ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo

SKU #: ZILZFT24RZILZAF012MF   |   MPN #: ZFT24R & ZAF012MF
$373.10
$373.10 $0.00
MSRP: $1,499.48

Available in stock

Zilmet ZHT18-30 4.8 Gal Capacity Cal Pro ZHT18-30 Hydronic Expansion Tank, 1/2 in Connection, NPT Connection, Carbon Steel Zilmet ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo

Zilmet ZHT18-30 4.8 Gal Capacity Cal Pro ZHT18-30 Hydronic Expansion Tank, 1/2 in Connection, NPT Connection, Carbon Steel Zilmet ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo

SKU #: ZILZHT1830ZILZAF012MF   |   MPN #: ZHT18-30 & ZAF012MF
$224.38
$224.38 $0.00
MSRP: $1,089.59

Available in stock

Zilmet ZEP5 2.1 gal In-line thermal expansion tank with 3/4" Stainless steel NPT connection with ZAFL2234 ActiveFlo Lite Point of Use Water Conditioner

Zilmet ZEP5 2.1 gal In-line thermal expansion tank with 3/4" Stainless steel NPT connection with ZAFL2234 ActiveFlo Lite Point of Use Water Conditioner

SKU #: ZILZEP5ZILZAFL2234   |   MPN #: ZEP5 & ZAFL2234
$213.32
$213.32 $0.00
MSRP: $1,155.03

Available in stock

Zilmet ZEP1 Expansion Tank and Shock Arrester, Butyl/304 Stainless Steel, MNPT Connection with ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo Water Conditioner

Zilmet ZEP1 Expansion Tank and Shock Arrester, Butyl/304 Stainless Steel, MNPT Connection with ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo Water Conditioner

SKU #: ZILZEP1ZILZAF012MF   |   MPN #: ZEP1 & ZAF012MF
$187.33
$187.33 $0.00
MSRP: $1,166.98

Available in stock

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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