--- product_id: 695743687 title: "Watts Non-Potable Water Expansion Tank, ETX-15, Carbon Steel, Round, Grey, 2.1 Gallons" brand: "watts" price: "235.56 DT" currency: TND in_stock: false url: https://www.desertcart.tn/products/695743687-watts-non-potable-water-expansion-tank-etx-15-carbon-steel store_origin: TN region: Tunisia --- # 1/2 inch threaded inlet/outlet 2.1 gal capacity 75 PSI max pressure Watts Non-Potable Water Expansion Tank, ETX-15, Carbon Steel, Round, Grey, 2.1 Gallons **Brand:** watts **Price:** 235.56 DT **Availability:** ❌ Out of Stock ## Summary > πŸ› οΈ Keep your heating system flawless with Watts’ powerhouse expansion tank! ## Quick Answers - **What is this?** Watts Non-Potable Water Expansion Tank, ETX-15, Carbon Steel, Round, Grey, 2.1 Gallons by watts - **How much does it cost?** 235.56 DT with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/695743687-watts-non-potable-water-expansion-tank-etx-15-carbon-steel) ## Best For - watts enthusiasts ## Why This Product - Trusted watts brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Versatile Installation:** Mounts vertically, horizontally, or inline to fit any commercial or residential setup - β€’ **Durable Carbon Steel Build:** Epoxy-coated tank ensures long-lasting corrosion resistance and rugged reliability - β€’ **Precision Pressure Control:** Maintains system pressure below relief valve setting for worry-free operation - β€’ **Factory Pre-Charged Convenience:** Comes pre-charged at 12 PSI for easy on-site adjustment and immediate use - β€’ **Optimized Thermal Expansion Management:** Butyl rubber diaphragm prevents water-air contact, extending system life ## Overview The Watts ETX-15 Non-Potable Water Expansion Tank is a 2.1-gallon, carbon steel, epoxy-coated tank designed for closed loop hydronic heating systems. It features a rugged butyl diaphragm to prevent water-air contact, a 75 PSI max working pressure, and a 1/2 inch male threaded connection. Pre-charged at 12 PSI, it offers versatile mounting options and reliable thermal expansion control for both commercial and residential applications. ## Description Watts ETX-15 Tank Non-Potable Water Expansion Tank This 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. This carbon steel tank is pre-charged at 12 PSI, tank volume is 2.1 gallons and features a durable expansion membrane that prevents contact of the water with the air in the tank. This rugged butyl diaphragm minimizes loss of the air change and ensures long and trouble-free life for the system. This tank is made of carbon steel with epoxy finish, mounts to supply piping, 1/2 MNPT system connection and a 0.302-32 charging valve connection (standard tire valve) to facilitate on-site charging of the tank to meet system requirements. The maximum working pressure is 75 PSI (5.3 BAR). IN-LINE, FREE STANDING, VERTICAL/HORIZONTAL, PIPE MOUNT TYPE; ISO 9001 APPLICABLE STANDARD; HEATING AND COOLING SYSTEM, COMMERCIAL, RESIDENTIAL CLOSED LOOP HYDRONIC HEATING SYSTEM APPLICATION; 220 DEG F TEMPERATURE RATING; MOUNTS TO SUPPLY PIPING INCLUSIONS/FEATURES; 75 PSI PRESSURE RATING; 2.1 GALLON TANK CAPACITY; 1/2 INCH MALE THREADED INLET/OUTLET CONNECTION; EPOXY CARBON STEEL TANK MATERIAL; 8 INCH DIAMETER X 12-1/2 INCH HEIGHT TANK DIMENSIONS; FACTORY PRE-CHARGED AIR CHARGE TYPE; 12 PSI AIR CHARGE CAPACITY; RUGGED FLEXIBLE BUTYL RUBBER DIAPHRAGM TYPE; COLOR GRAY; ETX MODEL ## Features - Watts ETX-15 Tank Non-Potable Water Expansion Tank This non-potable water expansion tank is ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0025POS7E | | Brand | Watts | | Brand Name | Watts | | Capacity | 2.1 gallons | | Colour | Grey | | Customer Reviews | 3.7 out of 5 stars 4 Reviews | | Item Dimensions L x W x H | 20.3L x 20.3W x 31.8H centimetres | | Item Shape | Round | | Manufacturer | Watts Water Technologies | | Manufacturer Part Number | 484020 | | Material | Carbon Steel | | Material Type | Carbon Steel | | Model Number | 66605 | | Number of Items | 1 | | Product dimensions | 20.3L x 20.3W x 31.8H centimetres | | Shape | Round | | UPC | 098268219340 | ## Product Details - **Brand:** Watts - **Capacity:** 2.1 gallons - **Colour:** Grey - **Material:** Carbon Steel - **Product dimensions:** 20.3L x 20.3W x 31.8H centimetres ## Images ![Watts Non-Potable Water Expansion Tank, ETX-15, Carbon Steel, Round, Grey, 2.1 Gallons - Image 1](https://m.media-amazon.com/images/I/41pGt0DJdKL.jpg) ## Frequently Bought Together - Watts ETX-15 2.1-Gallon Non-Potable Expansion Tank for Closed-Loop Systems - 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.tn/products/695743687-watts-non-potable-water-expansion-tank-etx-15-carbon-steel](https://www.desertcart.tn/products/695743687-watts-non-potable-water-expansion-tank-etx-15-carbon-steel) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-28*