--- product_id: 68236095 title: "18 Litre Aquasystems ARB18 Potable Expansion Vessel 3 Bar with Integrated Bracket - XVES050055" brand: "aquasystems" price: "¥59567" currency: JPY in_stock: true category: "Aquasystems" url: https://www.desertcart.jp/products/68236095-18-litre-aquasystems-arb18-potable-expansion-vessel-3-bar-integrated store_origin: JP region: Japan --- # 18L capacity for optimal water volume control Replaceable EPDM membrane for long-term durability Integrated wall bracket for seamless installation 18 Litre Aquasystems ARB18 Potable Expansion Vessel 3 Bar with Integrated Bracket - XVES050055 **Brand:** aquasystems **Price:** ¥59567 **Availability:** ✅ In Stock ## Summary > 💧 Keep your water system flawless with the ARB18 – the smart choice for savvy pros! ## Quick Answers - **What is this?** 18 Litre Aquasystems ARB18 Potable Expansion Vessel 3 Bar with Integrated Bracket - XVES050055 by aquasystems - **How much does it cost?** ¥59567 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/68236095-18-litre-aquasystems-arb18-potable-expansion-vessel-3-bar-integrated) ## 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 - • **Durable & Replaceable:** White epoxy-coated steel body with a replaceable EPDM membrane extends product lifespan. - • **Wide Temperature Range:** Operates efficiently from -10°C to 100°C, adapting to varying water heating demands. - • **Effortless Installation:** Integrated wall bracket and accessories included for quick, secure mounting. - • **Reliable Pressure Management:** Pre-charged at 3 Bar with a max pressure of 10 Bar to handle system fluctuations confidently. - • **Certified Safety & Compliance:** WRAS approved to meet UK potable water regulations, ensuring safe, clean water handling. ## Overview The 18 Litre Aquasystems ARB18 Potable Expansion Vessel is a WRAS-approved, durable water expansion tank designed for potable water systems. Featuring an integrated wall bracket for easy installation, a replaceable EPDM membrane for longevity, and a robust 3 Bar pre-charge pressure, it efficiently manages water volume changes caused by temperature fluctuations from -10°C to 100°C. Ideal for professional-grade water heating setups, it ensures compliance, reliability, and hassle-free maintenance. ## Description 18 Litre Aquasystems ARB18 Potable Expansion Vessel 3 Bar with Integrated Bracket - XVES050055 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 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 Bar * Maximum Pressure: 10.0 * Test Pressure: 10.0 * Temperature Range: -10°C - 100°C * Suitable for Fluid Group 2 ## Features - Potable Water Expansion Vessel - 18 Litre Capacity - Integrated Wall Bracket - Replaceable EPDM membrane - WRAS Approved ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01BGZQVY6 | | Batteries Required? | No | | Batteries included? | No | | Best Sellers Rank | 119,044 in DIY & Tools ( See Top 100 in DIY & Tools ) 230 in Water Heaters & Parts | | Colour | White | | Customer Reviews | 4.6 4.6 out of 5 stars (97) | | Date First Available | 4 Feb. 2016 | | Item Package Quantity | 1 | | Manufacturer | Reliance Water Controls | | Manufacturer reference | XVES050055 | | Part Number | XVES050055 | ## Images ![18 Litre Aquasystems ARB18 Potable Expansion Vessel 3 Bar with Integrated Bracket - XVES050055 - Image 1](https://m.media-amazon.com/images/I/41LT+nkA5NL.jpg) ## Questions & Answers **Q: Hi what size is the flexi pipe fitting . Am I correct in sayin 3/4 inch. Thanks very much** A: Good Morning, The fitting is indeed 3/4 on this vessel. **Q: Need replacement for aquasystem arb18 [m/f date april 2014] that came with gledhill unvented. will it fit the existing bracket?** A: This should fit a small wall bracket as per the original one that was provided & installed originally. This is a direct replacement. The B of ARB18 designates its the bracket fitting. **Q: Hi is this vessel pre charged to 3 bar. Many thanks.** A: Good Morning, Yes I can confirm this vessel is pre-charged to 3 bar **Q: What are the dimensions of this item?** A: H x 465mm - D x 280mm ## Frequently Bought Together - 18 Litre Aquasystems ARB18 Potable Expansion Vessel 3 Bar with Integrated Bracket - XVES050055 - Caleffi Multibloc Cold Water Control Valve 533112CST 3 & 6 Bar - Circlip - Caleffi – 6 Bar Pressure Relief Valve Circlip Connection F0000412 --- ## 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.jp/products/68236095-18-litre-aquasystems-arb18-potable-expansion-vessel-3-bar-integrated](https://www.desertcart.jp/products/68236095-18-litre-aquasystems-arb18-potable-expansion-vessel-3-bar-integrated) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-25*