The Joule Invacyl Standard Direct Unvented Cylinder 210 Litre is a direct-heated stainless-steel hot water storage cylinder designed for unvented mains-pressure hot water systems. With 210 litres of actual storage capacity, it provides a substantial hot water reserve for larger homes, multiple bathrooms and light commercial applications.
Built with an LDX 2101 stainless-steel cylinder, coated mild-steel outer casing and dense PU foam insulation, the cylinder combines durable construction with a specified heat loss of 1.92 kWh/24h. Two immersion positions support flexible direct electric heating or backup heating, while the cylinder is rated for up to 10 bar maximum mains water pressure and 7 bar operating pressure.
210 Litre Capacity
Direct Unvented
2 × 3 kW Immersions
25 Year Warranty
Immersion Positions
2 × 3 kW
Applications & suitability
Larger Family Homes
The 210-litre storage capacity is suited to larger residences with substantial domestic hot-water requirements.
Multiple Bathrooms
A suitable storage capacity for properties where hot water is required across multiple bathrooms and outlets.
Light Commercial Properties
Suitable for offices, small businesses and other light commercial installations requiring mains-pressure hot water storage.
Direct Electric Heating
Two immersion positions provide flexibility for direct electric heating or backup heating arrangements.
Key specifications
| Product Model |
Joule Invacyl Standard Direct Unvented Cylinder 210 Litre |
| Type |
Direct Unvented |
| Actual Capacity |
210 L |
| Unit Weight Empty |
41 kg |
| Unit Weight Full |
251 kg |
| Cylinder Material |
LDX 2101 |
| 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 |
7 bar |
| Safety Temperature |
90°C |
| Tested To Standard |
BS EN 50440:2015 |
| Heat Loss |
1.92 kWh/24h |
| Warranty Terms |
25 Years |
Installation & compatibility
The Joule Invacyl Standard Direct Unvented Cylinder 210 Litre is designed for direct-heated unvented hot water systems. It features two immersion positions with a specified 3 kW @ 230 V immersion specification, allowing flexibility for direct electric heating or backup heating. The cylinder is specified for a maximum mains water pressure of 10 bar and an operating pressure of 7 bar.
Design & performance benefits
LDX 2101 Stainless Steel
The cylinder uses LDX 2101 stainless steel for its specified inner vessel construction.
50 mm PU Insulation
Dense PU foam with a specified 50 mm thickness helps minimise heat loss, with a measured heat loss of 1.92 kWh/24h.
Direct Electric Heating
Two immersion positions provide flexibility for direct electric heating arrangements using the specified 3 kW @ 230 V immersion specification.
210 Litre Storage
The 210-litre storage capacity provides a substantial hot water reserve for larger residential and light commercial applications.
Additional installation features
Two Immersion Positions
Two immersion positions allow flexible direct electric heating or backup heating configurations.
High-Pressure Specification
The cylinder supports up to 10 bar maximum mains water pressure and 7 bar operating pressure.
BS EN 50440:2015
Tested to BS EN 50440:2015 as specified for this cylinder.
Ideal for
Larger Family Homes
Suitable for family homes and larger residences requiring 210 litres of stored hot water.
Multiple Bathroom Properties
A suitable capacity for properties with multiple bathrooms and higher domestic hot-water requirements.
Light Commercial Applications
Suitable for offices, small businesses and other light commercial hot water installations.
New Build & Renovation
Suitable for new-build and renovation projects requiring a direct-heated mains-pressure unvented cylinder.
The Joule Invacyl Standard Direct Unvented Cylinder 210 Litre provides 210 litres of hot water storage in a durable LDX 2101 stainless-steel cylinder. With two immersion positions, 50 mm dense PU foam insulation, 1.92 kWh/24h heat loss, 10 bar maximum mains pressure and 7 bar operating pressure, it is designed for larger residential and light commercial direct unvented hot water applications, backed by a 25-year warranty.
At GetPlumb, we strive to provide reliable and cost-effective delivery options to our customers. Please review our shipping policy below.
🆓 Free Local Delivery (Orders £100 & above)
We offer FREE delivery on orders £100 or more
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For orders that do not qualify for free delivery, standard
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- For cart weight between 0–2 kg, the shipping cost is £4.50 with a delivery time of 2–4 working days.
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This rate applies only to Harvey’s block salt products.
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Examples:
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For oversized items where the product length is 1.5 metres or more:
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Customers can also choose to collect their order from our store in
Reading, UK, at no additional charge. For any questions regarding shipping, please contact our support team at online@getplumb.co.uk.
