Joule Invacyl Standard In-Direct Unvented Cylinder 250 Litre - Stainless Steel
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Description
The Joule Invacyl Standard Indirect Unvented Cylinder 250 Litre (TRBMVI-0250LFC) is a stainless-steel hot water cylinder designed for mains-pressure domestic hot water systems. With a nominal 250-litre capacity and a listed actual capacity of 245.3 litres, it provides substantial stored hot water for larger homes and suitable light-commercial installations. Its indirect heating design uses a stainless-steel heat exchanger coil to transfer heat from a compatible boiler or other suitable primary heating system into the stored water.
Manufactured with an LDX 2101 stainless-steel inner vessel and a coated mild-steel outer casing, the Joule Invacyl cylinder is designed for durability and reliable hot water storage. The 316L stainless-steel coil is rated at 14.97 kW, with a surface area of 0.79 m², while the listed standing heat loss is 1.752 kWh per 24 hours. Supplied with a 3 kW immersion heater specification and backed by a listed 25-year warranty, this Joule 250L indirect unvented cylinder is an option for new-build projects, heating upgrades and replacement installations.
At a Glance
Applications & Compatibility
The Joule Invacyl Standard 250L indirect unvented cylinder is designed for installations that require stored domestic hot water supplied at mains pressure. Its indirect heating coil allows heat to be transferred from a compatible primary heating circuit to the stored water.
- Larger family homes: The 250-litre nominal capacity provides substantial hot water storage for properties with higher domestic hot water demand.
- Boiler heating systems: The indirect coil supports hot water heating from compatible gas or oil boiler systems, subject to the installation design.
- Heating system upgrades: Suitable for consideration when replacing an existing unvented cylinder with a compatible 250-litre model.
- New-build projects: Provides a stored hot water solution for residential developments where an indirect unvented cylinder is specified.
- Light-commercial installations: May suit smaller commercial applications where the storage capacity and recovery performance meet the required demand.
- Professional plumbing projects: Offers technical specifications for installers planning a mains-pressure hot water system.
Confirm the cylinder dimensions, usable capacity, coil compatibility, pressure ratings, expansion provisions and required safety components before ordering. Unvented hot water cylinders must be installed and commissioned by a suitably qualified professional in accordance with applicable regulations and manufacturer instructions.
Key Specifications
| Product Information | |
|---|---|
| Brand | Joule |
| Product Name | Invacyl Standard Indirect Unvented Cylinder 250 Litre |
| Manufacturer Model Code | TRBMVI-0250LFC |
| Cylinder Type | Standard |
| Heating Type | Indirect |
| System Type | Unvented |
| Nominal Capacity | 250 litres |
| Actual Capacity | 245.3 litres (supplied specification) |
| Warranty | 25 years listed; check component-specific terms |
| Construction & Insulation | |
| Inner Cylinder Material | LDX 2101 stainless steel (supplied specification) |
| Outer Casing | Coated mild steel |
| Thermal Insulation | Dense polyurethane (PU) foam |
| Foam Thickness | Listed as 0 mm; verify with the manufacturer |
| Empty Weight | 51 kg |
| Full Weight | 296 kg |
| Heat Exchanger & Immersion | |
| Number of Heat Exchangers | 1 |
| Heat Exchanger Coil Material | 316L stainless steel |
| Coil Rating | 14.97 kW |
| Coil Surface Area | 0.79 m² |
| Maximum Primary Pressure | 6 bar (listed specification) |
| Coil Resistance | 0.2 bar |
| Immersion Heater Specification | 3 kW at 230 V |
| Number of Immersion Heaters Listed | 1 |
| Operating Conditions & Performance | |
| Maximum Mains Water Pressure | 10 bar |
| Operating Pressure | 7 bar (listed specification) |
| Operating Temperature | 60°C |
| Safety Valve Temperature | 90°C |
| Standing Heat Loss | 1.752 kWh/24 hours (supplied specification) |
| Test Standard | BS EN 12897:2016 (supplied specification) |
Key Features & Benefits
1. 250-Litre Hot Water Storage
The 250-litre nominal capacity makes this Joule Invacyl cylinder suitable for larger domestic hot water systems and installations with substantial stored hot water requirements.
2. Indirect Stainless-Steel Heat Exchanger
The single 316L stainless-steel coil is rated at 14.97 kW, with a 0.79 m² surface area, to transfer heat from a compatible primary heating circuit into the stored water.
3. Durable Stainless-Steel Construction
The specified LDX 2101 stainless-steel inner vessel and coated mild-steel outer casing provide a robust construction for domestic hot water storage.
4. Designed for Mains-Pressure Systems
The unvented cylinder design delivers stored hot water from a pressurised supply, subject to the property's incoming mains pressure, pipework and correct installation.
5. 3kW Immersion Heater Support
The listed 3 kW, 230 V immersion heater specification provides an electric water-heating option when the appropriate compatible element and electrical controls are fitted.
6. Extended Listed Warranty
The product information lists a 25-year warranty. Check the current manufacturer warranty terms, as expansion vessels, inlet controls and other supplied components may have different coverage periods.
What's Included?
- Joule Invacyl Standard Indirect Unvented Cylinder 250 Litre (TRBMVI-0250LFC).
- One indirect stainless-steel heat exchanger coil, as specified for the cylinder.
The complete package contents have not been independently verified. Confirm whether the immersion heater, expansion vessel, cold water controls, safety valves, installation kit and other accessories are supplied with this particular product listing before ordering.
Who Is This Cylinder For?
The Joule Invacyl Standard 250L indirect unvented cylinder is designed for homeowners, plumbers, heating engineers and installers specifying a large-capacity stainless-steel hot water cylinder. It can be considered for larger family homes, compatible boiler systems, new-build developments and replacement projects where the storage capacity, coil performance and installation requirements match the property.
Installation & Setup
- Check the manufacturer's dimensions and ensure sufficient space is available for installation, pipework and future maintenance.
- Allow for the specified full weight of 296 kg and ensure the supporting floor is structurally suitable.
- Confirm that the boiler or other primary heat source is compatible with the indirect coil's rating and pressure requirements.
- Verify the incoming mains water pressure, operating limits and required unvented-cylinder safety components.
- Check the immersion heater rating and electrical requirements before connecting the element.
- Have the cylinder installed, safety devices fitted and the system commissioned by a suitably qualified professional in accordance with manufacturer instructions.
Frequently Asked Questions
1. What is the capacity of the Joule Invacyl Standard 250L cylinder?
The cylinder has a nominal capacity of 250 litres. The supplied product specification lists an actual capacity of 245.3 litres. Confirm the manufacturer's current capacity data before purchasing.
2. What does indirect unvented mean?
An indirect unvented cylinder stores domestic hot water in a sealed vessel supplied from the mains. A heat exchanger coil transfers heat from a separate primary heating circuit without mixing the primary heating water with the stored domestic hot water.
3. Which heating systems can be used with this cylinder?
The indirect coil is designed to work with a compatible primary heat source, such as a suitable gas or oil boiler. Other heating arrangements should be checked against the manufacturer's instructions and the specific system design.
4. What is the heat exchanger rating?
The supplied specification lists a single 316L stainless-steel heat exchanger coil rated at 14.97 kW, with a surface area of 0.79 m².
5. Does the Joule Invacyl 250L cylinder support an immersion heater?
The supplied specifications list one immersion heater rated at 3 kW and 230 V. Check the package contents to confirm whether the immersion element itself is included.
6. What is the operating pressure?
The supplied specification lists an operating pressure of 7 bar and a maximum mains water pressure of 10 bar. Verify these ratings against the current manufacturer's technical documentation and installation instructions.
7. What is the standing heat loss?
The supplied product information lists a standing heat loss of 1.752 kWh over 24 hours. Check the current technical datasheet for the applicable test conditions and declared figure.
8. What warranty is available?
The product information lists a 25-year warranty. The manufacturer's terms may provide different coverage periods for the cylinder vessel, expansion vessel, cold water controls and other supplied components.
9. Who should install an unvented hot water cylinder?
An unvented cylinder must be installed and commissioned by a suitably qualified professional who follows the applicable regulations and the manufacturer's instructions.
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