--- product_id: 4811297 title: "Watts ETX-30 4.5 Gal Carbon Steel Expansion Tank Hydronic Heating 75psi" price: "R9304" currency: ZAR in_stock: true url: https://www.desertcart.co.za/products/4811297-watts-etx-30-4-5-gal-carbon-steel-expansion-tank store_origin: ZA region: South Africa --- # 1/2" MNPT connection 60 psi max pressure 4.5 gal capacity Watts ETX-30 4.5 Gal Carbon Steel Expansion Tank Hydronic Heating 75psi **Price:** R9304 **Availability:** βœ… In Stock ## Summary > πŸ”₯ Keep your heat flowing, pressure controlled! πŸ”₯ ## Quick Answers - **What is this?** Watts ETX-30 4.5 Gal Carbon Steel Expansion Tank Hydronic Heating 75psi - **How much does it cost?** R9304 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/4811297-watts-etx-30-4-5-gal-carbon-steel-expansion-tank) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Pre-Charged at 12 PSI:** Ready to install and maintain optimal system pressure from day one. - β€’ **Robust Carbon Steel Build:** Epoxy-coated for durability and long-lasting performance under pressure. - β€’ **Versatile & Easy Mounting:** Direct supply piping installation with standard tire valve charging for hassle-free setup. - β€’ **Generous 4.5-Gallon Volume:** Handles thermal expansion with ease, keeping your system stable and efficient. - β€’ **Max Pressure Rating of 60 PSI:** Engineered to prevent overpressure, protecting your heating system’s longevity. ## Overview The Watts ETX-30 is a 4.5-gallon carbon steel expansion tank designed for closed loop hydronic heating systems. Pre-charged at 12 psi and rated for up to 60 psi, it controls thermal expansion to prevent overpressure. Its durable epoxy finish and easy mounting with a 1/2" MNPT connection ensure reliable, long-lasting performance in both residential and commercial settings. ## Description Product Description The Watts Non-Potable Water Expansion Tank, with a generous 4.5-gallon volume, is expertly designed for use in both commercial and residential closed loop hydronic heating systems. Its primary function is to control the thermal expansion of hot water, ensuring that system pressure remains below the relief setting of the relief valve and preventing overpressure situations.Constructed from high-quality carbon steel with a durable epoxy finish, this expansion tank is built to last. The tank features an expansion membrane that effectively minimizes the loss of the air charge, guaranteeing a long and trouble-free operational life for the entire heating system.The design of this water expansion tank allows for straightforward installation, as it mounts directly to the supply piping. It includes a 1/2" MNPT system connection and a 0.302-32" charging valve connection, which is a standard tire valve, facilitating easy on-site charging and maintenance.Pre-charged at 12 psi, this expansion tank is ready for immediate integration. With a maximum pressure rating of 60 psi, the Watts Non-Potable Water Expansion Tank is capable of handling significant pressure fluctuations. It works seamlessly in conjunction with hot water heaters to absorb increased water volume, thus preventing system overpressure. This feature not only ensures the safety of the system but also enhances its efficiency and longevity. Whether in a residential or commercial setting, this expansion tank provides a reliable solution for managing the thermal expansion of non-potable water in closed loop hydronic heating systems. From the Manufacturer Use the Watts series ETX water expansion tank in tandem with your hot water heater to absorb increased water volume resulting from hot water boiler heating and keep system pressure below the relief setting. Use in closed-loop, non potable water heating systems. Durable steel tank with 60 psi maximum working pressure. ## Features - WATER EXPANSION TANK: With a generous 4.5 tank gallon volume, the Watts Non-Potable Water Expansion Tank is designed for use in commercial and residential closed loop hydronic heating system piping to control the thermal expansion of hot water and maintain system pressure below the relief setting of the relief valve. - DURABLE CONSTRUCTION: This tank is constructed from high-quality carbon steel with an epoxy finish, ensuring long-lasting performance. It is also equipped with a durable expansion membrane that minimizes the loss of the air charge. - VERSATILE MOUNTING: This tank is designed for easy installation, mounting directly to the supply piping. It features a 1/2" MNPT system connection and a 0.302-32" charging valve connection (standard tire valve) to facilitate on-site charging. - HIGH PRESSURE CAPACITY: Pre-charged at 12 psi, this expansion tank is built to withstand the demands of hydronic heating systems, boasting a maximum pressure rating of 60 psi. It works in tandem with hot water heaters to absorb increased water volume, preventing system overpressure and ensuring the longevity and efficiency of the heating system. - EVERY DROP COUNTS: Water. It's in our name and close to our hearts. Since 1874, Watts Water Technologies has been delivering innovative technologies that make the world's most precious resource safe and accessible. Everything we design is made to keep the Earth's most precious resource safer, cleaner, and more useful for our customers. Our family of brands offers one of the most varied product lines in the world, with world-class, water-related solutions. ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.6 out of 5 stars 612 Reviews | ## Product Details - **Brand:** Watts - **Product Dimensions:** 10.5"W x 14.8"H - **Color:** Gray - **Wattage:** 30 watts - **Style:** Non-Potable ## Images ![Watts ETX-30 4.5 Gal Carbon Steel Expansion Tank Hydronic Heating 75psi - Image 1](https://m.media-amazon.com/images/I/51mEF4g1JWL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Frequently Bought Together - Watts ETX-30 Non-Potable Water Carbon Steel Expansion Tank for Closed Loop Hydronic Heating System Piping, 1/2" MNPT Connection, Tank Volume 4.7 Gallons, Maximum Pressure 75 psi - Taco 400-4 1/8-Inch-NPT Float Air Hy-Vent - Watts 0342691 30 PSI Pressure Relief Valve, Bronze, 3/4" 335 M2-030 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/4811297-watts-etx-30-4-5-gal-carbon-steel-expansion-tank](https://www.desertcart.co.za/products/4811297-watts-etx-30-4-5-gal-carbon-steel-expansion-tank) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-10-11*