The Joule Invacyl 120L Indirect Unvented Cylinder (TRBMVI-0120LFB) is a compact stainless-steel unvented hot water cylinder designed for mains-pressure domestic hot water systems. With an actual capacity of 116.4 litres, it uses a 316L stainless-steel indirect heating coil rated at 10.24 kW to provide reliable hot water storage. Its compact construction, dense PU foam insulation and low heat loss make it suitable for space-conscious residential and small commercial installations.
116.4 L Actual Capacity
Indirect Unvented
316L Stainless Steel Coil
25-Year Warranty
Capacity
116.4 L actual capacity
Heating Coil
10.24 kW, 316L stainless steel
Heat Loss
1.104 kWh/24h
Backup Immersion
1 × 3 kW @ 230 V
Applications & suitability
Small Homes & Apartments
The 116.4 L actual capacity is suited to homes and apartments with moderate domestic hot water demand.
Space-Conscious Installations
Compact construction makes the cylinder suitable for utility rooms and installations where available space is limited.
Indirect Heating Systems
Designed for suitable indirect systems using boilers, heat pumps or solar thermal as the primary heat source.
Small Commercial Applications
Suitable for small commercial installations requiring reliable mains-pressure hot water storage.
Key specifications
| Product Model |
Joule Invacyl 120L Indirect Unvented Cylinder - TRBMVI-0120LFB |
| Actual Capacity |
116.4 L |
| Max Mains Water Pressure |
10 bar |
| Operating Pressure |
7 bar |
| Operating Temperature |
60 °C |
| Safety Valve Temperature |
90 °C |
| Unit Weight Empty |
30 kg |
| Unit Weight Full |
146 kg |
| Cylinder Material |
LDX 2101 stainless steel |
| Outer Casing |
Coated mild steel |
| Thermal Insulation |
Dense PU foam |
| Foam Thickness |
0 |
| Heat Loss |
1.104 kWh/24h |
| Coil Material |
316L stainless steel |
| Coil Rating |
10.24 kW |
| Coil Surface Area |
0.59 m² |
| Coil Max Primary Pressure |
6 bar |
| Coil Resistance |
0.2 bar |
| Immersion Specification |
3 kW @ 230 V |
| No. of Immersions |
1 |
| No. of Heat Exchangers |
1 |
| Tested To Standard |
BS EN 12897:2016 |
| Warranty |
25 years |
Installation & compatibility
The Joule Invacyl 120L Indirect Unvented Cylinder is designed for suitable indirect heating systems using its internal 316L stainless-steel coil. The cylinder is intended for mains-pressure operation with a maximum mains water pressure of 10 bar and an operating pressure of 7 bar. Professional installation is required, and installers should ensure the complete system is suitable for the specified pressure and temperature ratings before commissioning.
Design & performance benefits
LDX 2101 Stainless Steel
The cylinder uses LDX 2101 stainless steel with a coated mild steel outer casing.
316L Heating Coil
The 10.24 kW 316L stainless-steel coil has a 0.59 m² surface area for indirect heating.
Dense PU Insulation
Dense PU foam insulation supports reduced heat loss, specified at 1.104 kWh/24h.
Compact Construction
The compact cylinder format is suited to space-conscious domestic and small commercial installations.
Additional installation features
Electric Immersion Provision
One 3kW immersion heater specification at 230V provides an additional electric heating option.
Pressure Capability
The cylinder is specified for up to 10 bar mains water pressure and 7 bar operating pressure.
Tested & Supported
Tested to BS EN 12897:2016 and supplied with a 25-year warranty term.
Ideal for
The Joule Invacyl 120L Indirect Unvented Cylinder is ideal for small family homes, apartments, renovations, new-build projects and compact plant rooms requiring reliable mains-pressure hot water storage. Its 116.4 L actual capacity, 10.24 kW 316L stainless-steel coil, dense PU foam insulation and 3kW immersion provision provide a practical solution for indirect domestic hot water systems with limited installation space.
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