Joule Invacyl Unvented 90L Direct Cylinder Standard Stainless Steel
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Description
The Joule Invacyl Unvented 90L Direct Cylinder is a compact stainless steel hot water storage solution designed for domestic properties and installations with modest hot water requirements. With a 90-litre capacity, direct heating configuration and mains-pressure hot water delivery, it is suitable for small homes, flats, apartments and renovation projects where space and dependable hot water supply are important.
Constructed from LDX 2101 stainless steel and insulated with 50mm dense polyurethane (PU) foam, this Joule Invacyl cylinder is specified with a heat loss of 1.25 kWh/24 hours. It includes a single 3kW immersion heater and is supplied with a stated 25-year warranty, subject to the manufacturer's terms and conditions.
At a Glance
About the Joule Invacyl 90L Direct Cylinder
The Joule Invacyl 90L Direct Cylinder is designed to store domestic hot water in an unvented system. Its direct configuration uses an immersion heater to heat the stored water, making it an option for properties requiring an electrically heated hot water cylinder without relying on an indirect coil connected to a boiler.
The cylinder uses LDX 2101 stainless steel with a coated mild steel outer casing. Its 50mm dense PU foam insulation is specified to provide thermal retention, with a stated standing heat loss of 1.25 kWh over 24 hours. The compact 90-litre capacity is intended for smaller-scale hot water demands, although actual suitability depends on household occupancy, usage patterns and recovery time.
Key Features
1. Compact 90-Litre Capacity
Provides 90 litres of stored hot water for smaller homes, flats and properties with modest daily hot water requirements.
2. LDX 2101 Stainless Steel
The stainless steel cylinder construction is designed for use in domestic hot water storage applications.
3. 50mm PU Foam Insulation
Dense polyurethane foam insulation helps reduce heat loss. The supplied specification lists a heat loss of 1.25 kWh/24 hours.
4. Single 3kW Immersion Heater
Includes one 3kW immersion heater rated at 230V for direct heating of the stored water.
5. Pressure and Temperature Ratings
The supplied data lists a maximum mains water pressure of 10 bar, an operating pressure of 7 bar and a safety temperature of 90°C. Follow the manufacturer's installation instructions.
6. Stated 25-Year Warranty
The supplied product information states a 25-year warranty. Confirm eligibility, registration requirements and exclusions with the manufacturer's warranty documentation.
Important Installation Information
Unvented hot water cylinders must be installed, commissioned and maintained by a suitably qualified professional in accordance with applicable UK Building Regulations and the manufacturer's instructions. Confirm the system pressure, safety devices, electrical supply, installation clearances and compatibility with the intended plumbing system before installation.
Product Specifications
| Product Name | Joule Invacyl Unvented 90L Direct Cylinder |
| Brand | Joule |
| Product Type | Direct Unvented Hot Water Cylinder |
| Actual Capacity | 90 litres |
| Empty Weight | 21kg |
| Full Weight | 111kg |
| Cylinder Material | LDX 2101 stainless steel |
| Outer Casing | Coated mild steel |
| Insulation Material | Dense PU foam |
| Insulation Thickness | 50mm |
| Number of Immersion Heaters | 1 |
| Immersion Heater Rating | 3kW at 230V |
| Maximum Mains Water Pressure | 10 bar |
| Operating Pressure (T&P, as supplied) | 7 bar |
| Safety Temperature | 90°C |
| Heat Loss | 1.25 kWh/24 hours |
| Test Standard (as supplied) | BS EN 50440:2015 |
| Warranty (as supplied) | 25 years, subject to manufacturer's terms |
Who Is This Product Suitable For?
- Small homes, flats and apartments with modest hot water requirements.
- Renovation and retrofit projects requiring a compact hot water storage solution.
- Properties using a compatible direct electric water-heating arrangement.
- Bathrooms and kitchens where stored hot water demand is appropriate for a 90-litre cylinder.
- Small offices or other premises with relatively low hot water demand, where the installation is suitable.
Frequently Asked Questions
1. What is the capacity of the Joule Invacyl Direct Cylinder?
The cylinder has a stated capacity of 90 litres, making it an option for smaller properties and lower hot water demand.
2. Is this a direct or indirect cylinder?
This is a direct unvented cylinder. The supplied specification lists one 3kW immersion heater for heating the stored water directly.
3. What insulation does this cylinder use?
It uses 50mm dense polyurethane foam insulation, with a stated heat loss of 1.25 kWh per 24 hours.
4. What is the maximum mains water pressure?
The supplied specifications list a maximum mains water pressure of 10 bar and an operating pressure of 7 bar. The installation must comply with the cylinder's rated limits and manufacturer instructions.
5. How much does the cylinder weigh?
The stated empty weight is 21kg, while the stated full weight is 111kg. Ensure the supporting surface and installation location are suitable for the filled cylinder.
6. What warranty is supplied?
The supplied product information states a 25-year warranty. Check the manufacturer's current warranty terms for registration requirements, installation conditions and exclusions.
Order the Joule Invacyl 90L Direct Cylinder
Choose a compact stainless steel hot water cylinder with 90-litre storage, a 3kW immersion heater and specified 50mm PU foam insulation for a suitable domestic installation.
Order Now from GetPlumb
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