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Domestic Hot Water Tanks

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Increase the hot water capacity of your home with one of our hot water expansion tanks or hot water storage tanks. Also help reduce water hammer with one of our water hammer arrestors.
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Model Number ST-12 is the Number 1 Seller
Learn More About Amtrol ST-12
Amtrol Therm-X-Trol - 4.4 Gallon - In-Line Thermal Expansion Tank
Model: ST-12
3/4" NPT Connection - 3.2 Gallons Max Acceptance
63% Buy This
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$46.00
In-Stock
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Model Number ST-5 is the Number 2 Seller
Learn More About Amtrol ST-5
Amtrol Therm-X-Trol - 2 Gallon - In-Line Thermal Expansion Tank
Model: ST-5
3/4" NPT Connection - 0.9 Gallons Max Acceptance
13% Buy This
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Q&A (1)
$39.00
In-Stock
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Model Number ST-30V is the Number 3 Seller
Learn More About Amtrol ST-30V
Amtrol Therm-X-Trol - 14 Gallon - Vertical Thermal Expansion Tank
Model: ST-30V
3/4" NPT Connection - 11.3 Gallons Max Acceptance
8% Buy This
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$209.00
In-Stock
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Model Number ST-25V is the Number 4 Seller
Learn More About Amtrol ST-25V
Amtrol Therm-X-Trol - 10.3 Gallon - Vertical Thermal Expansion Tank
Model: ST-25V
3/4" NPT Connection - 10.3 Gallons Max Acceptance
5% Buy This
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$149.00
In-Stock
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Model Number PFXT12I is the Number 5 Seller
Learn More About ProFlo PFXT12I
ProFlo
ProFlo PFXT - 4.8 Gallon - In-Line Thermal Expansion Tank
Model: PFXT12I
3/4" Stainless Steel NPTM Connection - 0.73 Gallons Max Acceptance
5% Buy This
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$35.00
In-Stock
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Learn More About Amtrol ST-20VC
Amtrol Therm-X-Trol® - 8 Gallon - Vertical Thermal Expansion Tank - ASME Certified
Model: ST-20VC
3/4" NPT Connection - 3.2 Gallons Max Acceptance
3% Buy This
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$1,600.00
Factory-Direct
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Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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2% Check Discount
Learn More About 2% Check Discount Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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Learn More About Amtrol ST-30VC
Amtrol Therm-X-Trol® - 14 Gallon - Vertical Thermal Expansion Tank - ASME Certified
Model: ST-30VC
3/4" NPT Connection - 8.96 Gallons Max Acceptance
3% Buy This
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$1,779.00
In-Stock
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Free Shipping & Lift Gate
Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About Amtrol ST-5C-DD
Amtrol Therm-X-Trol® - 2 Gallon - In-Line Thermal Expansion Tank - ASME Certified
Model: ST-5C-DD
3/4" NPT Connection - 0.9 Gallons Max Acceptance
3% Buy This
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$1,199.00
In-Stock
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Free Shipping
Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About Amtrol 537-1
Amtrol Diatrol - 0.75 Gallon - Water Hammer Arrestor
Model: 537-1
Amtrol - 537-1 - 0.75 Gallon - Water Hammer Arrestor - 3/4" NPT Connection
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
Q&A (1)
$100.00
Only 1 In-Stock
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Learn More About Amtrol ST-8
Amtrol Therm-X-Trol - 3.2 Gallon - In-Line Thermal Expansion Tank
Model: ST-8
3/4" NPT Connection - 1.9 Gallons Max Acceptance
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$55.00
In-Stock
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Learn More About Amtrol ST-42V
Amtrol Therm-X-Trol - 20 Gallon - Vertical Thermal Expansion Tank
Model: ST-42V
3/4" NPT Connection - 11.4 Gallons Max Acceptance
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$249.00
In-Stock
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Free Shipping
Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Learn More About Amtrol ST-60V
Amtrol Therm-X-Trol - 34 Gallon - Vertical Thermal Expansion Tank
Model: ST-60V
1-1/4" NPT Connection - 34 Gallons Max Acceptance
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$319.00
In-Stock
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Free Shipping
Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Learn More About Amtrol ST-80V
Amtrol Therm-X-Trol - 44 Gallon - Vertical Thermal Expansion Tank
Model: ST-80V
1-1/4" NPT Connection - 33.9 Gallons Max Acceptance
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$750.00
Only 5 In-Stock
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Free Shipping & Lift Gate
Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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Learn More About ProFlo PFXT5I
ProFlo
ProFlo PFXT - 2 Gallon - In-Line Thermal Expansion Tank
Model: PFXT5I
3/4" Stainless Steel NPTM Connection - 0.45 Gallons Max Acceptance
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$29.00
In-Stock
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Learn More About Amtrol ST-12C-DD
Amtrol Therm-X-Trol® - 6.4 Gallon - In-Line Thermal Expansion Tank - ASME Certified
Model: ST-12C-DD
3/4" NPT Connection - 3.2 Gallons Max Acceptance
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$1,508.00
In-Stock
Freight Icon
Free Shipping
Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About Amtrol ST-42VC
Amtrol Therm-X-Trol® - 18 Gallon - Vertical Thermal Expansion Tank - ASME Certified
Model: ST-42VC
3/4" NPT Connection - 11.4 Gallons Max Acceptance
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$1,987.00
Only 2 In-Stock
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Free Shipping & Lift Gate
Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About Amtrol ST-80VC
Amtrol Therm-X-Trol® - 53 Gallon - Vertical Thermal Expansion Tank - ASME Certified
Model: ST-80VC
1-1/4" NPT Connection - 34 Gallons Max Acceptance
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$3,119.00
In-Stock
Freight Icon
Free Shipping & Lift Gate
Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
Add To Cart
Learn More About Amtrol ST-180V
Amtrol Therm-X-Trol - 62 Gallon - Vertical Thermal Expansion Tank
Model: ST-180V
1-1/4" NPT Connection - 34.1 Gallons Max Acceptance
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$865.00
Factory-Direct
Freight Icon
Free Shipping & Lift Gate
Learn More About Free Freight *This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
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