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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 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
$60.70
$60.70 $0.00
MSRP: $317.52

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
$199.30
$199.30 $0.00
MSRP: $1,170.15

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
$78.17
$78.17 $0.00
MSRP: $403.62

Available in stock

Zilmet ZHT35F 9.2 Gal Hydronic Tank 3/4'' NPT Connection

Zilmet ZHT35F 9.2 Gal Hydronic Tank 3/4'' NPT Connection

SKU #: ZILZHT35F   |   MPN #: ZHT35F
$183.01
$183.01 $0.00
MSRP: $511.41

Available in stock

Watts 0067371 PLT-12 Potable Water Expansion Tank, 4.5 Gallon Tank

Watts 0067371 PLT-12 Potable Water Expansion Tank, 4.5 Gallon Tank

SKU #: WAT0067371   |   MPN #: 67371
$192.53
$192.53 $0.00
MSRP: $361

Available in stock

Watts 0067370 PLT-5 Potable Water Expansion Tank, 2.1 Gallon Tank

Watts 0067370 PLT-5 Potable Water Expansion Tank, 2.1 Gallon Tank

SKU #: WAT0067370   |   MPN #: 67370
$97.03
$97.03 $0.00
MSRP: $257

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
$202.99
$202.99 $0.00
MSRP: $1,061.01

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
$220.21
$220.21 $0.00
MSRP: $1,098.52

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
$189.66
$189.66 $0.00
MSRP: $1,179.78

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
$52.07
$52.07 $0.00
MSRP: $268.80

Available in stock

Zilmet ZHT80 21.1 Gal Cal Pro Hydronic Expansion Tank 3/4" Connection

Zilmet ZHT80 21.1 Gal Cal Pro Hydronic Expansion Tank 3/4" Connection

SKU #: ZILZHT80   |   MPN #: ZHT80
$262.74
$262.74 $0.00
MSRP: $727.95

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
$123.34
$123.34 $0.00
MSRP: $279.48

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
$116.62
$116.62 $0.00
MSRP: $243.58

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 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
$67.86
$67.86 $0.00
MSRP: $150.03

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
$133.16
$133.16 $0.00
MSRP: $343.56

Available in stock

Zilmet ZHT200 52.8 Gal Hydronic Tank 3/4'' NPT Connection

Zilmet ZHT200 52.8 Gal Hydronic Tank 3/4'' NPT Connection

SKU #: ZILZHT200   |   MPN #: ZHT200
$665.41
$665.41 $0.00
MSRP: $1,783.03

Special Order

Zilmet ZHT105 27.7 Gal Cal Pro Hyrdronic Expansion Tank 3/4" NPT Connection

Zilmet ZHT105 27.7 Gal Cal Pro Hyrdronic Expansion Tank 3/4" NPT Connection

SKU #: ZILZHT105   |   MPN #: ZHT105
$386.83
$386.83 $0.00
MSRP: $1,131.02

Available in stock

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

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

SKU #: ZILZHT400   |   MPN #: ZHT400
$1,663.56
$1,663.56 $0.00
MSRP: $3,649.68

Special Order

Zilmet ZHT35 9.2 Gal Hydronic Tank 3/4'' NPT Connection

Zilmet ZHT35 9.2 Gal Hydronic Tank 3/4'' NPT Connection

SKU #: ZILZHT35   |   MPN #: ZHT35
$181.06
$181.06 $0.00
MSRP: $420.38

Special Order

Zilmet Gal Hydronic Tank 3/4'' NPT Connection

Zilmet Gal Hydronic Tank 3/4'' NPT Connection

SKU #: ZILZHT150   |   MPN #: ZHT150
$524.42
$524.42 $0.00
MSRP: $1,436.58

Available in stock

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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