--- product_id: 74130990 title: "18 Litre Aquasystems ARB18 Potable Expansion Vessel 3.5 Bar with Integrated Bracket - XVES050056" brand: "aquasystems" price: "741.66 DT" currency: TND in_stock: true reviews_count: 8 category: "Aquasystems" url: https://www.desertcart.tn/products/74130990-18-litre-aquasystems-arb18-potable-expansion-vessel-3-5-bar store_origin: TN region: Tunisia --- # 18L capacity 3.5 Bar pre-charge pressure Integrated wall bracket 18 Litre Aquasystems ARB18 Potable Expansion Vessel 3.5 Bar with Integrated Bracket - XVES050056 **Brand:** aquasystems **Price:** 741.66 DT **Availability:** ✅ In Stock ## Summary > 💧 Expand your system’s potential with Aquasystems ARB18 – where efficiency meets effortless installation! ## Quick Answers - **What is this?** 18 Litre Aquasystems ARB18 Potable Expansion Vessel 3.5 Bar with Integrated Bracket - XVES050056 by aquasystems - **How much does it cost?** 741.66 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/74130990-18-litre-aquasystems-arb18-potable-expansion-vessel-3-5-bar) ## Best For - aquasystems enthusiasts ## Why This Product - Trusted aquasystems brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Space-Smart Design:** Integrated wall bracket for sleek, secure mounting - • **Temperature Toughness:** Operates reliably from -10°C to 100°C, perfect for fluctuating water temps - • **Durability Meets Compliance:** WRAS approved with replaceable EPDM membrane for longevity - • **Ready-to-Install Convenience:** Comes pre-pressurized at 3.5 Bar for instant fitting - • **Optimized Capacity for Modern Systems:** 18 litres to handle thermal expansion with ease ## Overview The Aquasystems ARB18 is an 18-litre potable water expansion vessel designed to manage thermal water expansion efficiently. Featuring a robust 3.5 Bar pre-charge pressure and an integrated wall bracket, it ensures easy installation and space-saving setup. WRAS approved and equipped with a replaceable EPDM membrane, it guarantees compliance and durability across a wide temperature range (-10°C to 100°C), making it an essential upgrade for modern water heating systems. ## Description 18 Litre Aquasystems ARB18 Potable Expansion Vessel 3.5 Bar with Integrated Bracket - XVES050056 The Aquasystems ARB Potable Expansion Vessels are manufactured to comply with UK water regulations and are tested and certified by WRAS. The vessels are supplied with a replaceable membrane and feature an integrated wall bracket. They come complete with wall bracket accessories as pictured. The main purpose of the vessel is to compensate for the increase in volume of water due to the varying water temperatures in the system, e.g. Water being heated from 0°C - 100°C will increase by approx 4.5%. Features: * Aquasystems potable water expansion vessel * Vessel incorporates an integrated wall bracket * Comes with wall bracket accessories as pictured * White Epoxy coated steel container * Replaceable EPDM membrane * Pre-Charge: 3.5 Bar * Maximum Pressure: 10.0 * Test Pressure: 10.0 * Temperature Range: -10°C - 100°C * Suitable for Fluid Group 2 * WRAS Approved Specification: * Capacity: 18 Litre * Pre-Charge: 3.5 Bar * Maximum Pressure: 10.0 * Test Pressure: 10.0 * Temperature Range: -10°C - 100°C * Suitable for Fluid Group 2 Review: Good value for money delivered ready to fit - It comes pressurised to correct BAR and ready for fitting or to replace existing one. A company quoted me in excess of £700 to replace the existing. I bought this from desertcart for less than £50. Another plumber who came to service the Boiler, fitted it in less than 10 minutes and did not charge me extra Review: Good price, just a shame the old ‘aqua system’ ... - Good price, just a shame the old ‘aqua system’ expansion vessel fitted with the cylinder only lasted 3 years! Let’s hope this one is of a better quality and that the manufacturer has upped their game! No complaints about the service of the supplier, prompt as usual. ## Features - Potable Water Expansion Vessel - 18 Litre Capacity - Integrated Wall Bracket - Replaceable EPDM membrane - WRAS Approved ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01BKE3P9W | | Batteries Required? | No | | Batteries included? | No | | Best Sellers Rank | 232,468 in DIY & Tools ( See Top 100 in DIY & Tools ) 117 in Bathroom Vessels | | Colour | White | | Customer Reviews | 4.5 4.5 out of 5 stars (66) | | Date First Available | 8 Feb. 2016 | | Item Package Quantity | 1 | | Manufacturer | Reliance Water Controls | | Manufacturer reference | XVES050056 | | Part Number | XVES050056 | ## Images ![18 Litre Aquasystems ARB18 Potable Expansion Vessel 3.5 Bar with Integrated Bracket - XVES050056 - Image 1](https://m.media-amazon.com/images/I/41LT+nkA5NL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good value for money delivered ready to fit *by A***R on 17 November 2022* It comes pressurised to correct BAR and ready for fitting or to replace existing one. A company quoted me in excess of £700 to replace the existing. I bought this from Amazon for less than £50. Another plumber who came to service the Boiler, fitted it in less than 10 minutes and did not charge me extra ### ⭐⭐⭐⭐⭐ Good price, just a shame the old ‘aqua system’ ... *by J***N on 21 January 2018* Good price, just a shame the old ‘aqua system’ expansion vessel fitted with the cylinder only lasted 3 years! Let’s hope this one is of a better quality and that the manufacturer has upped their game! No complaints about the service of the supplier, prompt as usual. ### ⭐⭐⭐⭐⭐ Perfect *by S***E on 16 August 2023* Very fast delivery, came fully pressurised and ready to fit. ## Frequently Bought Together - 18 Litre Aquasystems ARB18 Potable Expansion Vessel 3.5 Bar with Integrated Bracket - XVES050056 - Range Spare TS214 Expansion Vessel Hose --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/74130990-18-litre-aquasystems-arb18-potable-expansion-vessel-3-5-bar](https://www.desertcart.tn/products/74130990-18-litre-aquasystems-arb18-potable-expansion-vessel-3-5-bar) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-12*