--- product_id: 59962991 title: "300 Litre Optimum Electrically Heated Direct Unvented Hot Water Storage Cylinder" brand: "optimum cylinders" price: "€ 1661.60" currency: EUR in_stock: false url: https://www.desertcart.hr/products/59962991-300-litre-optimum-electrically-heated-direct-unvented-hot-water-storage store_origin: HR region: Croatia --- # 300 Litre Optimum Electrically Heated Direct Unvented Hot Water Storage Cylinder **Brand:** optimum cylinders **Price:** € 1661.60 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** 300 Litre Optimum Electrically Heated Direct Unvented Hot Water Storage Cylinder by optimum cylinders - **How much does it cost?** € 1661.60 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/59962991-300-litre-optimum-electrically-heated-direct-unvented-hot-water-storage) ## Best For - optimum cylinders enthusiasts ## Why This Product - Trusted optimum cylinders brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description 300 Litre Optimum Electrically Heated Direct Unvented Hot Water Storage Cylinder The Optimum Direct Unvented Hot Water Cylinder is the new and affordable range from RM Cylinders. As with the rest of RM's range of unvented products, it has been carefully developed and purpose built to existing building and water standards. The Optimum Direct Unvented is designed to offer hot water in properties where auxiliary heat sources are not available. The Optimum Direct utilises electricity to power two built in 3kW immersion heaters. The unit is environmentally friendly and the highly efficient foam installed has been developed to give you the best results without sacrificing space. When other heat sources are not present, the Optimum Direct is the perfect affordable and obvious choice. Features: * Suitable for properties where auxiliary heat sources are not present * Heated by an electrical immersion heater * 22mm compression fittings throughout * Superior 1mm duplex stainless steel * Clearly labelled connections * 3kW Incoloy Immersion fitted as standard * Designed with a new flat base for increased stability * 50mm insulation foam * Butt welding for longer life * WRAS approved * 25 Year Guarantee * 2 Year Component Guarantee * Energy Related Product ErP Rating: D Technical Specification: * Capacity: 300 Litre * Height: 1980mm * Diameter: 545mm * Weight (Empty): 45kg * Weight (Full): 345kg * Immersion Heater Re-heat time: 323mins * Heat Loss: 2.24 kWh/24h * Noise level: 15dB * ErP Rating: D Supplied With: * Cold Water Inlet Set * Tundish * Expansion Vessel * T& P Relief Valve * 3kW Immersion Heater ## Features - Suitable for properties where auxiliary heat sources are not present - Please note due to the size of the item we are unable to ship to offshore locations. - 22mm compression fittings throughout - 25 Year Guarantee - WRAS approved ## Images ![300 Litre Optimum Electrically Heated Direct Unvented Hot Water Storage Cylinder - Image 1](https://images-eu.ssl-images-amazon.com/images/I/41r4ZbyVhJL.jpg) --- ## 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.hr/products/59962991-300-litre-optimum-electrically-heated-direct-unvented-hot-water-storage](https://www.desertcart.hr/products/59962991-300-litre-optimum-electrically-heated-direct-unvented-hot-water-storage) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-13*