The Joule Invacyl Slimline Direct Unvented Cylinder 180L is a high-capacity stainless steel hot water cylinder designed for unvented mains-pressure systems. Its slimline design provides 180 litres of hot water storage while helping maximise available floor and plant-room space. It is particularly suited to larger homes, family properties, multi-bathroom installations and renovation projects where both capacity and space efficiency are important.
Constructed from LDX 2101 stainless steel with a coated mild steel outer casing, the Invacyl Slimline 180L combines durable construction with 50mm dense PU foam insulation. With a specified heat loss of 1.7 kWh/24h, two 3kW immersion heaters and support for mains water pressure up to 10 bar, it is designed to provide dependable hot water flow to multiple outlets.
Cylinder Type
Direct Unvented
Key Features
180-Litre Hot Water Capacity
The 180-litre capacity is designed to meet higher domestic hot water requirements, making the cylinder suitable for larger family homes and properties with multiple bathrooms.
Slimline Space-Saving Design
The slimline format helps maximise available installation space while providing a larger hot water storage capacity, making it useful for renovation and retrofit projects where space is limited.
LDX 2101 Stainless Steel Construction
The cylinder is manufactured from LDX 2101 stainless steel, providing the specified corrosion-resistant construction for long-term hot water storage applications.
50mm Dense PU Foam Insulation
Dense PU foam insulation with a specified thickness of 50mm helps retain stored hot water. The 180L cylinder has a stated heat loss of 1.7 kWh/24h.
Two 3kW Immersion Heaters
Two immersion heaters rated at 3kW @ 230V provide direct electric heating capability and support hot water recovery for higher-demand installations.
High-Pressure Mains Water Operation
The cylinder supports maximum mains water pressure of up to 10 bar, with a stated operating pressure of 7 bar, providing mains-pressure hot water delivery to multiple outlets.
Space-Efficient Hot Water Storage
The Joule Invacyl Slimline 180L combines higher-capacity hot water storage with a slimline format designed to make efficient use of available installation space. Its unvented configuration provides mains-pressure hot water for properties where multiple outlets may be used at the same time.
Larger Family Homes
180L storage capacity suited to larger residential properties and family homes with increased hot water demand.
Multiple Bathrooms
Designed for properties where several bathrooms and hot water outlets may require a consistent stored supply.
Space-Conscious Installations
Slimline construction helps maximise available floor or plant-room space while retaining 180L storage capacity.
Direct Electric Heating
Two 3kW immersion heaters provide direct electric heating capability for the stored hot water.
Safety & Performance
The Joule Invacyl Slimline 180L has a specified maximum mains water pressure of 10 bar, an operating pressure of 7 bar and a safety temperature of 90°C. The cylinder is stated to have been tested to BS EN 50440:2015.
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Maximum mains water pressure: 10 bar
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Operating pressure: 7 bar
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Safety temperature: 90°C
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Tested to: BS EN 50440:2015
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Warranty: 25 years
Technical Specifications
| Product Model |
Joule Invacyl Slimline Direct Unvented Cylinder (180L) |
| Actual Capacity |
180 L |
| Unit Weight – Empty |
38 kg |
| Unit Weight – Full |
212 kg |
| Cylinder Material |
LDX 2101 stainless steel |
| Outer Casing |
Coated mild steel |
| Thermal Insulation |
Dense PU foam |
| Foam Thickness |
50 mm |
| Number of Immersions |
2 |
| Immersion Specification |
3 kW @ 230 V |
| Maximum Mains Water Pressure |
10 bar |
| Operating Pressure (T & P) |
7 bar |
| Safety Temperature |
90°C |
| Heat Loss |
1.7 kWh/24h |
| Tested To Standard |
BS EN 50440:2015 |
| Warranty |
25 years |
Ideal For
The Joule Invacyl Slimline Direct 180L is suited to properties requiring higher-capacity, mains-pressure hot water storage in a space-efficient cylinder format.
- Larger residential and family homes
- Properties with multiple bathrooms
- Multi-occupancy and shared properties
- Renovation and retrofit projects where space is limited
- Kitchens and bathrooms with simultaneous outlet use
- Small commercial and office settings with moderate hot water demand
Frequently Asked Questions
What is the Joule Invacyl Slimline 180L?
The Joule Invacyl Slimline 180L is a direct unvented stainless steel hot water cylinder designed for mains-pressure hot water systems. It provides 180 litres of actual hot water storage in a slimline format.
How many immersion heaters does the cylinder have?
The cylinder has two immersion heaters, with each immersion specified at 3kW @ 230V.
What is the heat loss of the Joule Invacyl 180L?
The specified heat loss is 1.7 kWh per 24 hours. The cylinder uses 50mm dense PU foam insulation to help retain stored hot water.
What pressure can the Joule Invacyl 180L operate at?
The maximum mains water pressure is specified as 10 bar, with an operating pressure of 7 bar.
What material is the Joule Invacyl cylinder made from?
The cylinder is manufactured from LDX 2101 stainless steel and features a coated mild steel outer casing.
What is the warranty on the Joule Invacyl 180L?
The supplied product information specifies a 25-year warranty.
Joule Invacyl Slimline Direct 180L Unvented Cylinder
A high-capacity, space-efficient stainless steel unvented cylinder combining 180L hot water storage, 50mm PU foam insulation, two 3kW immersion heaters and mains-pressure operation for larger homes and higher-demand installations.
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