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Collection: 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

Zilmet cream-colored cylindrical well tank with brand logo and side connection port.

Zilmet ZHP302 ZHP302 Well Tank, 79.3 Gal Tank, 1-1/4 in Connection, NPT Connection

SKU #: ZILZHP302   |   MPN #: ZHP302

Regular price $1,247.28
Sale price $1,247.28 Regular price $0.00
MSRP: $4,594.62

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

Cream-colored Zilmet well tank with rounded top, red logo, and side connection valve.

Zilmet ZHP351 119 Gal Well Tank, 1-1/4 in Connection, NPT Connection

SKU #: ZILZHP351   |   MPN #: ZHP351

Regular price $1,763.17
Sale price $1,763.17 Regular price $0.00
MSRP: $7,648.57

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

Almond-colored cylindrical thermal expansion tank with Zilmet logo and black top connection port.

Zilmet ZHP202 21.1 Gal Hydro-Plus Thermal Expansion Tank, 1 in Connection, Carbon Steel, Epoxy, Almond

SKU #: ZILZHP202   |   MPN #: ZHP202

Regular price $308.12
Sale price $308.12 Regular price $0.00
MSRP: $1,459.80

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

Almond-colored cylindrical thermal expansion tank with Zilmet logo and flat base for floor mounting.

Zilmet ZHP200F Floor Mounted Thermal Expansion Tank 1" NPT Connection, Butyl/Carbon Steel/Stainless Steel, Epoxy Powder-Coated, Almond

SKU #: ZILZHP200F   |   MPN #: ZHP200F

Regular price $285.26
Sale price $285.26 Regular price $0.00
MSRP: $1,124.60

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

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 Zilmet ZAF012MF 1/2'' MNPT X 1/2'' FNPT Activflo Solo

SKU #: ZILZHT815ZILZAF012MF   |   MPN #: ZHT8-15 & ZAF012MF

Regular price $206.00
Sale price $206.00 Regular price $0.00
MSRP: $1,053.86

Available in stock

Zilmet ZFT24R flat rectangular gray hydronic expansion tank with brass connection port and Zilmet logo.

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

Regular price $373.10
Sale price $373.10 Regular price $0.00
MSRP: $1,499.48

Available in stock

Silver rectangular hydronic expansion tank with Zilmet logo and brass connection valve on top.

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

Regular price $269.64
Sale price $269.64 Regular price $0.00
MSRP: $1,193.72

Available in stock

Zilmet cream-colored thermal expansion tank with red and blue logo, featuring black top cap and outlet valve.

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

Regular price $207.23
Sale price $207.23 Regular price $0.00
MSRP: $1,155.03

Available in stock

Gray cylindrical hydronic expansion tank with Zilmet branding and 1/2 inch NPT connection ports.

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

Regular price $224.38
Sale price $224.38 Regular price $0.00
MSRP: $1,089.59

Available in stock

Zilmet ZEP1 expansion tank and shock arrester with stainless steel construction, MNPT connection, and black valve cap.

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

Regular price $187.33
Sale price $187.33 Regular price $0.00
MSRP: $1,166.98

Available in stock

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

Zilmet ZS18 Stainless steel expansion tank

SKU #: ZILZS18   |   MPN #: ZS18

Regular price $476.69
Sale price $476.69 Regular price $0.00
MSRP: $989.50

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

Regular price From $121.81
Sale price From $121.81 Regular price $0.00
MSRP: $564.48

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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