Joule Invacyl 150L Indirect Unvented Cylinder (TRBMVI-0150LFB) is a compact stainless-steel hot-water cylinder designed for unvented, mains-pressure systems. It provides 146.4 litres of usable hot-water capacity and heats indirectly through a 316L stainless-steel coil. A compatible primary heat source and the wider system components are required.
The supplied specification lists a maximum mains-water pressure of 10 bar, an operating pressure of 7 bar, dense PU foam insulation and a 25-year warranty, subject to the applicable terms. Check the exact product variant, system compatibility and warranty conditions with the supplier before ordering.
150L Class Cylinder
Indirect Unvented
146.4L Usable Capacity
25-Year Warranty*
At a Glance
Cylinder Type
Indirect Unvented
Designed for a mains-pressure system
Usable Capacity
146.4L
150L model designation
Operating Pressure
7 bar
Maximum mains pressure: 10 bar
Warranty
25 years*
Confirm current terms and eligibility
What Is an Indirect Unvented Cylinder?
An indirect unvented cylinder stores domestic hot water and heats it through a coil connected to a separate primary heat source, such as a boiler or compatible heat pump. Because it is unvented, it is designed to operate from the mains-water supply rather than a separate cold-water storage tank. The heat source, controls, safety components and installation must all be suitable for the cylinder and the property.
Applications & Suitability
The Joule Invacyl 150L may suit smaller homes or apartments with moderate hot-water demand, or projects where a compact cylinder is needed. It may be considered for systems using a compatible boiler, heat pump or solar-thermal arrangement. Choose cylinder capacity and heat-source configuration based on the property’s hot-water requirements and system design—not household size alone.
Important Installation Guidance:
Unvented cylinder installation, commissioning and servicing should be carried out by a suitably qualified professional in accordance with the manufacturer’s instructions and applicable requirements. Confirm that the location, primary circuit, controls, safety components and discharge arrangements are appropriate for the exact model.
Key Features
146.4L Usable Capacity
Provides 146.4 litres of stated usable hot-water capacity in a cylinder in the 150L product class.
Stainless-Steel Construction
The supplied specification lists an LDX 2101 stainless-steel cylinder with a coated mild-steel outer casing.
Indirect Heating Coil
A 316L stainless-steel coil is listed with a 10.24kW rating, 0.59m² surface area and 0.2 bar resistance.
Mains-Pressure Operation
Specified for an operating pressure of 7 bar and maximum mains-water pressure of 10 bar. Confirm actual site conditions and system requirements.
Dense PU Foam Insulation
Dense polyurethane foam insulation is listed, with a stated heat loss of 1.272kW per 24 hours.
Immersion-Ready
The specification lists one 3kW immersion heater at 230V. Confirm the supplied equipment and electrical requirements with the seller.
Key Specifications
| Product |
Joule Invacyl 150L Indirect Unvented Cylinder |
| Model / Product Code |
TRBMVI-0150LFB |
| Brand |
Joule |
| Cylinder Type |
Indirect unvented cylinder |
| Nominal Capacity |
150L model designation |
| Actual Usable Capacity |
146.4L |
| Maximum Mains-Water Pressure |
10 bar |
| Operating Pressure |
7 bar |
| Operating Temperature |
60°C |
| Safety Valve Temperature |
90°C |
| Cylinder Material |
LDX 2101 stainless steel |
| Outer Casing |
Coated mild steel |
| Thermal Insulation |
Dense PU foam |
| Heat Loss |
1.272kW/24h, as supplied |
| Coil Material |
316L stainless steel |
| Coil Rating |
10.24kW |
| Coil Surface Area |
0.59m² |
| Maximum Primary Pressure |
6 bar |
| Coil Resistance |
0.2 bar |
| Immersion Specification |
3kW at 230V; one immersion listed |
| Number of Heat Exchangers |
1 |
| Empty Weight |
38kg |
| Full Weight |
184kg |
| Test Standard |
BS EN 12897:2016 |
| Warranty |
25 years, subject to the manufacturer’s terms |
Who Is This Cylinder For?
This cylinder may be suitable for homeowners, landlords and heating professionals planning a compact indirect unvented hot-water system. It could be considered for a smaller home, apartment, renovation or new-build project where the available space, hot-water demand, heat source and system pressures have been checked for compatibility.
Installation & Warranty
1
Check hot-water demand and available space: Have the cylinder capacity and installation location assessed against the household’s needs and site dimensions.
2
Confirm system compatibility: Check that the heat source, primary circuit, controls, immersion and safety components are suitable for the cylinder and operating conditions.
3
Verify warranty terms: Confirm the current 25-year warranty terms, registration requirements and any installation or servicing conditions with Joule or the seller.
Frequently Asked Questions
How much usable hot water does it store?
The supplied product specification lists an actual usable capacity of 146.4 litres.
What does indirect mean?
The cylinder heats stored domestic hot water through a coil connected to a separate primary heat source. The cylinder and heat source must be compatible.
Does it include an immersion heater?
The supplied specification lists one 3kW immersion at 230V. Confirm what is included with the exact product being supplied.
What is the warranty period?
The supplied details state a 25-year warranty. Check the current terms and any eligibility, registration or installation conditions with the manufacturer or seller.
Can it be installed in any home?
Not automatically. The cylinder should be selected after checking hot-water demand, available space, water pressure, heat-source compatibility and installation requirements.
A Compact Indirect Unvented Cylinder for Mains-Pressure Hot Water
The Joule Invacyl 150L Indirect Unvented Cylinder (TRBMVI-0150LFB) offers 146.4 litres of stated usable capacity, a 316L stainless-steel heating coil and dense PU foam insulation. Check that its capacity, dimensions and system specifications suit the property, and confirm the warranty terms with the supplier before purchase.
