AMTROL Therm Trol Line Thermal Expansion ST-5C-DD 150 2-GAL K5

( Brand: Amtrol ), ( Manufacturer Part Number: ST5CDD ), ( Model: ST-5 ), ( Compatible Brand: Universal ), ( Power Source: Hydronic ), ( Items Included: Fittings ), ( Compatible Product: Storage Tank Water Heater ), ( Item Length: 13 In ), ( Maximum Temperature: 200 F ), ( Type: Thermal Expansion Tank ), ( Tank Capacity: Less Than 20 Gal ), ( Unit Type: Gal ), ( Water Connection Location: Top ), ( Item Weight: 6.5 Lbs ), ( Country Of Origin: United States )

Review AMTROL Therm x trol 150 2-gal In line Thermal Expansion K5

The AMTROL ST5CDD Therm-X-Trol ST-5C-DD 150 is a high-performance, 2-gallon in-line thermal expansion tank designed to ensure optimal heating system performance and longevity. This expansion tank, manufactured by AMTROL, is an essential component for residential and light commercial hot water heating systems.

The tank is engineered with a corrosion-resistant, polypropylene construction, ensuring long-lasting durability and resistance to the harsh chemicals commonly found in heating systems. The polypropylene material is also non-toxic and safe for potable water applications.

The ST5CDD Therm-X-Trol features a unique, patented, vertical design, which helps minimize air and debris accumulation. The tank's compact design allows for easy installation in tight spaces, while its 150-degree Fahrenheit working temperature range accommodates most heating systems.

One of the key advantages of this expansion tank is its integrated, factory-installed thermostat, which maintains a consistent temperature and helps prevent over-expansion of the heating system. The thermostat is adjustable from 120 F to 160 F (49 C to 71 C), allowing for flexibility in various heating system applications.

The ST5CDD Therm-X-Trol also includes an integrated air eliminator, which helps prevent air from entering the system during operation. This feature ensures that the heating system operates efficiently and effectively, while also reducing the potential for noise and vibration caused by trapped air.

The tank's 2-gallon capacity provides ample space for accommodating the thermal expansion that occurs in heating systems. The expansion tank's connection ports are threaded for easy and secure installation, and it is compatible with most standard heating system components.

In summary, the AMTROL ST5CDD Therm-X-Trol ST-5C-DD 150 is a high-quality, corrosion-resistant, 2-gallon in-line thermal expansion tank. Its innovative design features a factory-installed thermostat, air eliminator, and vertical construction, making it an essential component for optimal heating system performance and longevity.

The Amtrol ST5CDD Therm-X-Trol ST-5C-DD 1-1/2 Inch 150-2 Gal In-Line Expansion Tank is a thermal expansion tank designed to help prevent damage caused by water pressure changes due to temperature fluctuations in a hydronic heating system. Here are some pros and cons that might help you decide if this product is right for you:

1. Designed for use with hydronic heating systems, making it a reliable option for homes and buildings that rely on this type of heating.

2. The tank has a 150-gallon water capacity and a 2-gallon expansion chamber, allowing it to accommodate significant temperature changes and prevent damage to the system.

3. The ST5CDD model comes with a factory-installed check valve, which helps prevent backflow and ensures that the expansion tank only fills up when necessary.

4. The tank is made of corrosion-resistant materials, including an FDA-approved food-grade liners and a copper-nickel alloy heater element. This ensures that the tank will last for a long time and will not corrode or rust.

5. The compact design of the tank makes it easy to install in tight spaces, making it a popular choice for homes and buildings with limited installation space.

1. The tank may be more expensive than some other types of expansion tanks, due to its high-quality construction materials and larger capacity.

2. The tank requires a minimum operating temperature of 40 degrees Fahrenheit to function properly, so it may not be suitable for use in colder climates.

3. The tank may not be suitable for use with high-pressure hydronic heating systems, as it is designed for systems with a maximum operating pressure of 160 psi.

Overall, the Amtrol ST5CDD Therm-X-Trol ST-5C-DD 1-1/2 Inch 150-2 Gal In-Line Expansion Tank is a high-quality and reliable option for those looking to protect their hydronic heating system from damage caused by temperature fluctuations. While it may be more expensive than some other types of expansion tanks, its corrosion-resistant construction materials, large capacity, and factory-installed check valve make it a worthwhile investment for those who want to ensure the longevity and effectiveness of their heating system.

If you have a hydronic heating system and are looking for a reliable expansion tank to protect it from damage caused by temperature fluctuations, the Amtrol ST5CDD Therm-X-Trol ST-5C-DD 1-1/2 Inch 150-2 Gal In-Line Expansion Tank is a great option to consider. Its high-quality construction materials, large capacity, and factory-installed check valve make it a reliable and effective solution for preventing damage to your heating system. While it may be more expensive than some other types of expansion tanks, the peace of mind and protection it provides make it a worthwhile investment for those who want to ensure the long-term performance and efficiency of their heating system.

Details:

Up for sale is a NEW - Not in original packaging Amtrol Therm-X-Trol ST-5C-DD 150 2-Gal In-Line Thermal Expansion K5.

part #: st5cdd prices

• $39.99-$720.00

specifications wateheat:

• brand: Amtrol
• mpn: St5cdd
• model: St-5
• compatible brand: Universal
• power source: Hydronic
• items included: Fittings
• compatible product: Storage Tank Water Heater
• item length: 13 In
• maximum temperature: 200 F
• type: Thermal Expansion Tank
• tank capacity: Less Than 20 Gal
• unit type: Gal
• water connection location: Top
• item weight: 6.5 Lbs
• country of origin: United States

shipping wateheat:

• class: Standard
• service: FedEx Ground / FedEx Home Delivery, UPS Ground, USPS Ground Advantage
• cost: $27.31
• carrier: FedEx, UPS, USPS
• transit: 4-8 Days
• type: Calculated

general wateheat:

• condition: Open box
• Heating, Cooling Air > Water Heaters > Water Heater Parts

payments wateheat:

• wallet: Google-pay
• other
• credit card: Discover

returns wateheat:

• method: Money back
• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

seller wateheat:

• city: Florence, Missouri
• rating: 100.0%
• # reviews: 6054

offer wateheat:

• quantity: 1
• options: Ship-to-home
• started: March 20, 2026
• sold: 0
• availability: In Stock

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