The Joule 90L Invacyl Indirect Standard Cylinder (TRBMVI-0090LFC) is a compact stainless-steel unvented hot water storage cylinder designed for mains-pressure systems. With an 86.4-litre actual capacity, it provides stored hot water for small homes, apartments and compact plant rooms while using indirect heating through a 316L stainless-steel primary coil.
The cylinder combines an LDX 2101 stainless-steel inner vessel, coated mild-steel outer casing and dense PU foam insulation with a measured heat loss of just 0.96 kWh/24h. Its 316L stainless-steel coil is rated at 5.3kW with a 0.59m² surface area, while the cylinder supports up to 10 bar maximum mains pressure and 7 bar operating pressure.
86.4 L Actual Capacity
Indirect Unvented
5.3 kW Coil
25 Year Warranty
Applications & suitability
Small Homes & Apartments
The compact 86.4-litre actual capacity is suited to smaller residential properties with moderate hot-water requirements.
Compact Plant Rooms
A compact cylinder option for plant rooms and utility areas where available installation space is limited.
Indirect Heating Systems
The 316L stainless-steel coil allows the cylinder to be heated indirectly by a compatible primary heating source.
Retrofit & New Build
Suitable for renovation, replacement and new-build projects requiring a compact mains-pressure unvented cylinder.
Key specifications
| Product Model |
Joule 90L Invacyl Indirect Standard Cylinder - TRBMVI-0090LFC |
| Type |
Indirect Unvented |
| Actual Capacity |
86.4 L |
| Maximum Mains Water Pressure |
10 bar |
| Operating Pressure |
7 bar |
| Operating Temperature |
60°C |
| Safety Valve Temperature |
90°C |
| Unit Weight Empty |
23 kg |
| Unit Weight Full |
109 kg |
| Cylinder Material |
LDX 2101 |
| Outer Casing |
Coated Mild Steel |
| Thermal Insulation |
Dense PU Foam |
| Foam Thickness |
0 |
| Heat Loss |
0.96 kWh/24h |
| Coil Material |
316L Stainless Steel |
| Coil Rating |
5.3 kW |
| Coil Surface Area |
0.59 m² |
| Coil Maximum Primary Pressure |
6 bar |
| Coil Resistance |
0.2 bar |
| Immersion Specification |
3 kW @ 230 V |
| Number of Immersions |
1 |
| Number of Heat Exchangers |
1 |
| Tested To Standard |
BS EN 12897:2016 |
| Warranty Terms |
25 Years |
Installation & compatibility
The Joule 90L Invacyl Indirect Standard Cylinder is designed for indirect unvented hot water systems using a compatible primary heating source. Its 316L stainless-steel coil has a 5.3 kW rating, 0.59m² surface area, 6 bar maximum primary pressure and 0.2 bar resistance. The cylinder is specified for up to 10 bar maximum mains water pressure and 7 bar operating pressure.
Design & performance benefits
LDX 2101 Stainless Steel
The LDX 2101 stainless-steel cylinder provides the specified inner vessel construction for the unvented hot water system.
316L Stainless-Steel Coil
The indirect heating coil is manufactured from 316L stainless steel and has a 5.3 kW rating with a 0.59m² surface area.
Dense PU Insulation
Dense PU foam insulation contributes to the cylinder's specified heat loss of just 0.96 kWh/24h.
Compact Storage
The 86.4-litre actual capacity provides a compact stored hot water solution for smaller properties and space-conscious installations.
Additional installation features
Immersion Backup
Includes one immersion specification rated at 3 kW @ 230 V for electric heating capability.
High Pressure Specification
Supports maximum mains water pressure of 10 bar and a specified operating pressure of 7 bar.
BS EN 12897:2016
Tested to BS EN 12897:2016 as specified for the product.
Ideal for
Small Family Homes
Suitable for smaller households with moderate domestic hot-water requirements.
Flats & Apartments
An 86.4-litre actual capacity option for apartments and other compact residential properties.
Compact Plant Rooms
Suitable for space-conscious utility and plant room installations requiring indirect hot water storage.
Renovation & New Build
Designed for renovation, replacement and new-build projects requiring a compact indirect unvented cylinder.
The Joule 90L Invacyl Indirect Standard Cylinder TRBMVI-0090LFC combines 86.4 litres of actual hot water storage with an LDX 2101 stainless-steel cylinder, 316L stainless-steel 5.3kW coil and dense PU foam insulation. With 10 bar maximum mains pressure, 7 bar operating pressure, 0.96 kWh/24h heat loss, BS EN 12897:2016 testing and a 25-year warranty, it is suited to compact indirect unvented hot water installations.
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