Amtrol ST-12 Thermal Expansion Tank
The Amtrol THERM-X-TROL ST-12 Expansion Tank is designed to eliminate this problem by providing control of maximum pressures at a level below the relief valve setting. It also provides an additional space in the system to accommodate the increased volume of water created by thermal expansion, returning it to the system when hot water delivery is demanded
Amtrol ST-12 Thermal Expansion Tank
Nº de artículo: 5859904

Amtrol ST-12 Thermal Expansion Tank

Nº de artículo: 5859904

CRC 83982

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The Amtrol THERM-X-TROL ST-12 Expansion Tank is designed to eliminate this problem by providing control of maximum pressures at a level below the relief valve setting. It also provides an additional space in the system to accommodate the increased volume of water created by thermal expansion, returning it to the system when hot water delivery is demanded
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What Stands Out

High Capacity
The Amtrol ST-12 features a 12-gallon capacity, expertly designed to accommodate thermal expansion in residential water heating systems, ensuring optimal performance and protection for plumbing infrastructure.
Durable Construction
Constructed with heavy-duty steel and coated with a corrosion-resistant liner, this tank guarantees long-lasting durability, minimizing maintenance needs and replacement frequency in your home water system.
Easy Installation
The Amtrol ST-12 is designed for straightforward installation, allowing homeowners to effortlessly integrate it into existing systems, thereby enhancing efficiency without the need for extensive plumbing knowledge or professional help.

Detalles de producto

Shop Amtrol ST-12 Thermal Expansion Tank online at a best price in Costa Rica. B001BNPSFW
  • Amtrol ST-12 THERM-X-TROL Expansion Tank, 4.4 Gallon (141N43)
  • Eliminates the waste of energy and water, saving money
  • Prevents the relief valve from going off
  • Protects the water heater and plumbing fixtures from premature failure
  • Prevents dangerous pressure build-up in the system
  • Designed to control maximum pressures and provide additional space for water volume due to thermal expansion

Who Should Buy?

Suitable For
  • Homeowners

    Ideal for homeowners installing a closed-loop water heating system to manage thermal expansion efficiently.

  • Plumbers

    Perfect for professional plumbers who require reliable and effective thermal expansion solutions for clients.

  • Energy Efficiency Seekers

    Great for users looking to enhance energy efficiency and prolong the lifespan of their water heating systems.

Not Suitable For
  • Small Apartments

    Not suitable for small apartments with minimal hot water demand where expansion tank is unnecessary.

DESCRIPCIÓN DEL PRODUCTO

Amtrol ST-12 Thermal Expansion Tank

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Preguntas y respuestas de los clientes

  • Pregunta: What is the purpose of the Amtrol ST-12 Thermal Expansion Tank?

    Respuesta: The Amtrol ST-12 Thermal Expansion Tank serves to manage excess pressure within a closed water heating system. Installed alongside your water heater, this tank absorbs the expanding hot water, preventing excessive pressure build-up that can lead to leaks or burst pipes. By maintaining a consistent pressure level, the tank helps to prolong the lifespan of your plumbing system and enhances overall efficiency.
  • Pregunta: How does the Amtrol ST-12 Thermal Expansion Tank function?

    Respuesta: This thermal expansion tank operates by utilizing a bladder that separates air and water. As water heats up, it expands, and the bladder compresses the air to accommodate this expansion. This dynamic balance prevents the build-up of pressure in your plumbing system. Understanding this function is crucial for homeowners, as it helps to prevent costly repairs associated with plumbing issues due to pressure spikes.
  • Pregunta: What size of the system is the Amtrol ST-12 suitable for?

    Respuesta: The Amtrol ST-12 is designed for residential water heating systems, generally recommended for systems with a capacity of up to 50 gallons. It’s ideal for standard home use, ensuring optimal performance for most water heaters. When selecting the right size, consider the volume of hot water your household consumes; this ensures effective thermal expansion management while maintaining system efficiency.
  • Pregunta: Can I install the Amtrol ST-12 Thermal Expansion Tank myself?

    Respuesta: Yes, the Amtrol ST-12 can be installed by a savvy DIYer with basic plumbing knowledge. It typically requires basic hand tools for installation and careful attention to the tank's orientation and plumbing connections. However, for best results and to ensure compliance with local codes, consulting with a professional plumber is advisable. This also guarantees that the system works correctly and safely to avoid any potential issues.
  • Pregunta: What materials is the Amtrol ST-12 Thermal Expansion Tank made from?

    Respuesta: The Amtrol ST-12 is constructed from high-quality steel with a protective coating to resist rust and corrosion, which enhances durability over time. The internal diaphragm is made of rubber for flexibility and resilience. This robust construction ensures that the tank remains functional under pressure and during temperature fluctuations, making it an excellent long-term addition to your water heating system.
  • Pregunta: What are the signs that my thermal expansion tank needs replacing?

    Respuesta: You may need to replace your Amtrol ST-12 if you notice leaking water, a frequently cycling water heater, or inconsistent water pressure in your fixtures. Another indication is the presence of water hammer noises when using hot water. Regular checks can help maintain system performance; however, recognizing these signs early can prevent more significant plumbing challenges from developing.
  • Pregunta: How does the Amtrol ST-12 contribute to energy efficiency?

    Respuesta: By regulating pressure in your plumbing system, the Amtrol ST-12 helps maintain optimal conditions for your water heater to operate efficiently. Reducing stress on plumbing components leads to lower energy consumption and fewer heat losses. Ultimately, this contributes to long-term savings on energy bills while promoting a more sustainable household environment.
  • Pregunta: Is maintenance required for the Amtrol ST-12 Thermal Expansion Tank?

    Respuesta: While the Amtrol ST-12 is designed for longevity, periodic maintenance is advisable to ensure optimal function. Regularly check the air pressure within the tank and make adjustments as needed, typically every few months. Additionally, a visual inspection for rust or corrosion can help catch issues early, thus maintaining the tank’s efficiency and prolonging its operational lifespan.
  • Pregunta: Where can I buy the Amtrol ST-12 Thermal Expansion Tank in Costa Rica?

    Respuesta: You can purchase the Amtrol ST-12 Thermal Expansion Tank from Ubuy, which offers a wide selection of home improvement products, including this thermal expansion tank. Ubuy provides a convenient online shopping experience, making it easy to find the right products for your plumbing needs.
  • Pregunta: What should I consider before buying the Amtrol ST-12?

    Respuesta: Before purchasing the Amtrol ST-12, consider the size and capacity of your water heating system, as well as the plumbing layout of your home. It’s important to assess whether you require a tank that accommodates your specific needs, including the expected volume of hot water usage. Additionally, reviewing customer feedback and installation requirements can offer valuable insights to ensure it’s the right fit for your system.

Amtrol Water Heater Parts Editorial Review

The Amtrol ST-12 Thermal Expansion Tank is a reliable choice for preventing pressure buildup in a hot water system. It is easy to install and has a larger capacity than most thermal expansion tanks. The useful leak check feature provides added peace of mind. Made in USA, this tank is a great investment for protecting your hot water heater. However, some users have reported issues with the included turbulator and potential cosmetic damage upon delivery. Please note that this item is non-returnable according to the seller's policy.

Customer Reviews & Ratings

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ventajas

  • Easy to install
  • Larger capacity than most thermal expansion tanks
  • Useful leak check feature
  • Made in USA

Contras

  • Turbulator may not fit or be necessary for all installations

Platform Trust & Buyer Confidence

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Jasmin
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“Great products and very good service: very easy and very fast international delivery.”

9 September 2026 · via Trustpilot
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Anke
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“Wonderful online shopping experience, smooth transaction from the start. Payment method works conveniently and delivery is unexpectedly fast and reliable. You go the extra mile for service. What makes this even more amazing, you deliver to Namibia. I will remain a happy Ubuy customer and will increase my purchases for sure! Thank you!”

10 September 2026 · via Trustpilot
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Hazel
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“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”

10 September 2026 · via Trustpilot
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Opaleye
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“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”

11 September 2026 · via Trustpilot
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Adele
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“Easy to find and order what you want on the website. Delivery is quick to the UK”

8 September 2026 · via Trustpilot
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Información importante

  • Limitaciones: Para los productos enviados al extranjero, ten en cuenta que cualquier garantía del fabricante puede no ser válida; las opciones de servicio del fabricante pueden no estar disponibles; los manuales del producto, las instrucciones y las advertencias de seguridad pueden no estar en los idiomas del país de destino; los productos (y los materiales que los acompañan) pueden no estar diseñados de acuerdo con las normas, especificaciones y requisitos de etiquetado del país de destino; y los productos pueden no ajustarse al voltaje del país de destino y a otras normas eléctricas (lo que requiere el uso de un adaptador o convertidor, si procede). El destinatario es responsable de asegurarse de que el producto puede ser importado legalmente al país de destino. Cuando hagas un pedido a Ubuy o a sus filiales, el destinatario es el importador registrado y debe cumplir todas las leyes y normativas del país de destino.
  • No todos los productos que aparecen en Ubuy están a la venta, ya que Ubuy es un motor de búsqueda a nivel mundial. Los productos están sujetos a las normas de exportación/comercio.