The Joule Cyclone Platinum 400 Litre Indirect Unvented Hot Water Cylinder (TCEMVI-0400LFC) is a high-capacity stainless-steel hot water storage solution designed for large residential properties and suitable light-commercial installations. With a 400-litre nominal capacity and 390-litre actual volume, this indirect unvented cylinder provides substantial stored hot water for properties with high domestic hot water demand.
Manufactured with an LDX 2101 stainless-steel inner cylinder, a coated mild-steel outer casing and dense polyurethane foam insulation, the Joule Cyclone Platinum cylinder is designed for durability and reduced standing heat loss. Its 316L stainless-steel primary heat exchanger has a 25 kW rating and 1.16 m² surface area to support heat transfer from a compatible primary heating system. A 3 kW immersion heater option is also listed for electric backup, subject to the supplied configuration.
400L Nominal Capacity
390L Actual Volume
25kW Primary Coil
Stainless-Steel Construction
1-Year Warranty
At a Glance
Nominal Capacity
400 Litres
Primary Coil Rating
25 kW
Standing Heat Loss
2.45 kWh/24h
Applications & Compatibility
The Joule Cyclone Platinum 400L indirect unvented cylinder is designed for hot water systems requiring a large stored water volume and a compatible primary heating source.
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Large residential properties: Provides substantial stored hot water for households with multiple bathrooms and higher hot water demand.
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Light-commercial installations: Can be considered for guesthouses, small offices and salons where the required hot water capacity matches the installation.
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Boiler-connected systems: The 25 kW primary coil supports indirect water heating from a suitably compatible boiler system.
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Suitable heat pump systems: Compatibility should be assessed against the heat pump's output, flow temperature and the cylinder's coil requirements.
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Replacement and renovation projects: A high-capacity stainless-steel cylinder option for appropriately designed unvented hot water systems.
Installation Note:
Confirm the cylinder dimensions, access requirements, full operating weight, primary coil compatibility and system pressure limits before ordering. The stated full weight is 462 kg, so suitable floor loading and handling arrangements are essential. Unvented hot water cylinders must be installed and commissioned by a suitably qualified professional in accordance with manufacturer instructions and applicable regulations.
Key Specifications
| Product Information |
| Product Name |
Joule Cyclone Platinum 400L Indirect Unvented Cylinder |
| Model / Stock Code |
TCEMVI-0400LFC |
| Brand |
Cyclone |
| Product Group Code |
CYCLONE |
| Item Category Code |
IndirectUnvented |
| Product Type |
Stainless Indirect Cylinder |
| Nominal Capacity |
400 litres |
| Actual Volume |
390 litres |
| Warranty |
1 year |
| Construction & Insulation |
| Inner Cylinder Material |
LDX 2101 stainless steel |
| Outer Casing |
Coated mild steel |
| Thermal Insulation |
Dense polyurethane (PU) foam |
| Foam Thickness (Listed) |
0 (confirm specification with manufacturer) |
| Heat Exchanger & Immersion Heater |
| Number of Heat Exchangers |
1 |
| Coil Material |
316L stainless steel |
| Primary Coil Rating |
25 kW |
| Coil Surface Area |
1.16 m² |
| Maximum Primary Pressure |
3.5 bar |
| Coil Resistance |
0.08 bar |
| Number of Immersion Heaters Listed |
1 |
| Immersion Heater Specification |
3 kW at 230 V |
| Operating Conditions & Performance |
| Maximum Mains Water Pressure |
10 bar |
| Operating Pressure (Listed) |
7 bar |
| Operating Temperature |
60°C |
| Safety Valve Temperature |
90°C |
| Standing Heat Loss |
2.45 kWh/24 hours |
| Test Standard |
BS EN 12897:2016 |
| Weight |
| Empty Weight |
62 kg |
| Full Weight |
462 kg |
Key Features & Benefits
1. High-Capacity 400L Storage
The 400-litre nominal capacity and 390-litre actual volume provide substantial stored hot water for large homes and suitable light-commercial installations.
2. Durable Stainless-Steel Construction
The LDX 2101 stainless-steel inner cylinder is designed for durable hot water storage, while the coated mild-steel outer casing provides a protective exterior finish.
3. 25kW Primary Heat Exchanger
The 316L stainless-steel coil has a 25 kW rating and 1.16 m² surface area to support heat transfer from a compatible primary heating system.
4. Dense PU Foam Insulation
Dense polyurethane foam insulation helps limit standing heat loss. The listed heat-loss figure is 2.45 kWh over 24 hours.
5. 3kW Immersion Heater Provision
The specifications list one 3 kW, 230 V immersion heater provision for supplementary electric heating, subject to the selected configuration and installation requirements.
6. Defined Pressure & Safety Ratings
The listed maximum mains water pressure is 10 bar, operating pressure is 7 bar and safety valve temperature is 90°C. Installation must follow the manufacturer's specified limits.
What's Included?
- Joule Cyclone Platinum 400L Indirect Unvented Cylinder (TCEMVI-0400LFC)
The specifications list one immersion heater provision, but do not confirm that the immersion heater itself is included. Check the supplied package contents for immersion heaters, safety components, valves, controls and installation accessories before ordering.
Who Is This Cylinder For?
The Joule Cyclone Platinum 400L indirect unvented cylinder is intended for homeowners, plumbers, heating engineers and installers specifying high-capacity hot water storage. Its large storage volume, stainless-steel construction and 25 kW primary coil make it worth considering for large residential properties and suitable light-commercial projects where the system design supports its capacity and operating requirements.
Installation & Setup
- Check the installation space, access route and required service clearances before delivery.
- Plan handling and structural support for the listed full weight of 462 kg.
- Confirm primary heat-source compatibility with the 25 kW coil rating and maximum primary pressure of 3.5 bar.
- Ensure the system operates within the specified pressure and temperature limits.
- Have the cylinder, safety devices and any immersion heater installed and commissioned by suitably qualified professionals.
Frequently Asked Questions
1. What is the capacity of the Joule Cyclone Platinum TCEMVI-0400LFC?
The cylinder has a nominal capacity of 400 litres and a stated actual volume of 390 litres, making it suitable for installations requiring substantial stored hot water.
2. Is this an indirect unvented hot water cylinder?
Yes. The TCEMVI-0400LFC is listed as a stainless-steel indirect unvented cylinder, using a primary heat exchanger coil to transfer heat from a compatible heating system to the stored water.
3. What is the primary coil rating?
The cylinder has one 316L stainless-steel heat exchanger coil rated at 25 kW, with a listed surface area of 1.16 m².
4. Does the cylinder support an immersion heater?
The supplied specifications list one immersion heater provision rated at 3 kW and 230 V. Confirm whether the heater itself is included with the product before ordering.
5. What is the standing heat loss?
The listed standing heat loss is 2.45 kWh per 24 hours. Actual system energy consumption depends on operating conditions, hot water demand and installation configuration.
6. What is the full weight of the cylinder?
The listed empty weight is 62 kg and the full weight is 462 kg. Appropriate handling equipment, access planning and structural support should be considered before installation.
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