Is this for potable water?

It is not made for potable water system. But in a regular installation some water from the tank can mix with a potable water. The tank has a polypropylene liner and butyl diaphragm, which may be in contact with water. You have to decide for yourself if you want to drink water from a polypropylene container.

Can this tank be install horizontally?

Amtrol instruction says: "Mount tank vertically in downward position only. Ensure the piping can support the entire weight of the tank when full of water". This makes sense to me.

Is this compatable with ethylene glycol? I want it for the glycol side of a heat exchanger on a solar water heater.

I don't know. It may be best to contact the Amtrol technical support to see if ethylene glycol is compatible with the bladder diaphragm chemistry in this unit.

what's the capacity in gallons?

It's a 12 liter tank, so it holds approximately 4.4 gallons.

Amtrol St 12 Thermal Expansion Tank

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

SAR 783

Duties & taxes included

In stock

Sold byAmazon KSADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to KSA.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Description

💧 Stay ahead of pressure spikes—protect your home and wallet with Amtrol ST-12!

TRUSTED QUALITY - Made in USA with a proven track record and 4.6-star rating from 300+ users
DURABILITY BOOST - Extends water heater and plumbing lifespan by preventing premature failures
PRESSURE GUARDIAN - Keeps system pressure below relief valve threshold to avoid leaks and damage
ENERGY WATER SAVER - Eliminates costly thermal expansion waste for smarter utility bills
EASY INSTALLATION MAINTENANCE - Designed for hassle-free mounting and simple pressure checks with visual indicator

The Amtrol ST-12 Thermal Expansion Tank is a 4.4-gallon solution engineered to manage thermal expansion in closed potable water systems. By absorbing excess pressure, it prevents relief valve discharge, conserves water and energy, and safeguards your water heater and plumbing from premature wear. Trusted by professionals and homeowners alike, this durable, easy-to-install tank ensures efficient, safe hot water delivery while reducing costly system failures.

Specifications

ASIN	B001BNPSFW
Best Sellers Rank	#428,499 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,029 in Water Heater Replacement Parts
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (324)
Date First Available	June 25, 2008
Item Package Quantity	1
Item Weight	2.2 pounds
Item model number	ST-12
Manufacturer	AMTROL
National Stock Number	5430-01-626-6547
Part Number	ST-12
Power Source	Ac/dc
Product Dimensions	8 x 11 x 15 inches
Size	one-size

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.