The Joule Cyclone Standard Indirect Short Unvented Cylinder 250 Litre is a durable stainless-steel hot water storage cylinder designed for indirect unvented systems. With a 250L nominal capacity and 247L actual usable capacity, it provides dependable stored hot water for large residential properties and light-commercial applications.
Featuring an LDX 2101 stainless steel cylinder, 316L stainless steel heat exchanger and a powerful 26.55 kW primary coil with 0.77 m² surface area, the cylinder is designed for efficient heat transfer. Dense PU foam insulation helps minimise standby heat loss, while the coated mild-steel outer casing provides a durable and serviceable finish.
250L Capacity
Indirect Unvented
26.55 kW Primary Coil
LDX 2101 Stainless Steel
1 Year Warranty
Key Performance Highlights
250L
Nominal Capacity
26.55 kW
Primary Coil Rating
2.14
kWh/24h Heat Loss
7 bar
Operating Pressure
Applications & Suitability
The Joule Cyclone Standard Indirect Short 250L is suited to applications requiring a high-capacity stored hot water solution and powerful primary heat transfer.
- Large residential properties with multiple bathrooms and high hot-water demand.
- Small commercial premises such as guesthouses and offices requiring reliable stored hot water.
- Renovation and replacement projects where a compact short cylinder profile is preferred.
- Heating systems requiring a powerful 26.55 kW primary coil for heat transfer.
- Installations where higher mains pressure capability and stainless-steel construction are preferred.
Key Specifications
| Model |
Standard Indirect Short 250 L |
| Brand |
CYCLONE |
| Capacity |
250 L (actual 247 L) |
| Item Category Code |
IndirectUnvented |
| Product Group Code |
CYCLONE |
| Product Type |
Stainless Indirect Cylinder |
| Cylinder Material |
LDX 2101 stainless steel |
| Outer Casing |
Coated mild steel |
| Thermal Insulation |
Dense PU foam |
| Foam Thickness |
0 |
| Number of Immersions |
1 |
| Immersion Specification |
3 kW @ 230 V |
| Number of Heat Exchangers |
1 |
| Coil Material |
316L stainless steel |
| Coil 1 Rating |
26.55 kW |
| Coil 1 Surface Area |
0.77 m² |
| Coil 1 Max Primary Pressure |
3.5 bar |
| Coil 1 Resistance |
0.06 bar |
| Max Mains Water Pressure |
10 bar |
| Operating Pressure |
7 bar |
| Operating Temperature |
60 °C |
| Safety Valve Temperature |
90 °C |
| Tested To Standard |
BS EN 12897:2016 |
| Heat Loss |
2.14 kWh/24h |
| Unit Weight Empty |
49 kg |
| Unit Weight Full |
299 kg |
| Warranty Terms |
1 year |
Indirect Heating & Heat Transfer
The cylinder is designed for indirect unvented hot water systems, using a dedicated 316L stainless steel heat exchanger to transfer heat into the stored water. Its 26.55 kW primary coil has a 0.77 m² surface area and a coil resistance of 0.06 bar, supporting effective primary-side heat transfer.
26.55 kW Coil
High-capacity primary coil with a 0.77 m² surface area for indirect heating.
316L Stainless Steel
The heat exchanger is constructed from 316L stainless steel.
Low Coil Resistance
The primary coil has a stated resistance of 0.06 bar.
Construction & Thermal Insulation
The Joule Cyclone cylinder combines an LDX 2101 stainless steel inner cylinder with dense PU foam insulation and a coated mild-steel outer casing. This construction provides a durable storage solution while helping to reduce heat loss during periods of stored hot water demand.
LDX 2101 Stainless Steel
Stainless steel cylinder construction designed for durable hot water storage.
Dense PU Foam
Dense polyurethane foam insulation helps minimise standby heat loss.
Coated Mild-Steel Casing
A coated mild-steel outer casing provides a durable, serviceable finish.
Pressure, Temperature & Safety
The cylinder is specified for an operating pressure of 7 bar and a maximum mains water pressure of 10 bar. It has an operating temperature of 60 °C and a safety valve temperature of 90 °C. The unit is tested to BS EN 12897:2016.
- Maximum mains water pressure: 10 bar.
- Operating pressure: 7 bar.
- Operating temperature: 60 °C.
- Safety valve temperature: 90 °C.
- Coil maximum primary pressure: 3.5 bar.
- Tested to BS EN 12897:2016.
Backup Immersion Heater
The cylinder is specified with one immersion heater, rated at 3 kW @ 230 V. This provides an electric boost or backup heating option alongside the indirect primary coil.
Installation & Handling
The Joule Cyclone Standard Indirect Short 250L has an empty weight of 49 kg and a full weight of 299 kg. These weights should be considered when planning handling, positioning and installation. Specific installation dimensions and clearances were not provided and should be confirmed before installation.
Ideal For
- Large homes with multiple bathrooms and high hot-water demand.
- Small commercial properties such as guesthouses and offices.
- Replacement and renovation projects requiring a short cylinder profile.
- Indirect unvented systems requiring a 26.55 kW primary coil.
- Installations where stainless-steel cylinder construction is preferred.
Frequently Asked Questions
What is the capacity of the Joule Cyclone Standard Indirect Short 250L?
The cylinder has a nominal capacity of 250 litres and an actual stated capacity of 247 litres.
Is this cylinder direct or indirect?
It is an indirect unvented cylinder with one 316L stainless steel heat exchanger.
What is the primary coil rating?
The primary coil is rated at 26.55 kW and has a surface area of 0.77 m².
What material is the cylinder made from?
The cylinder is made from LDX 2101 stainless steel, with a coated mild-steel outer casing.
Does it have an immersion heater?
Yes. The specification includes one 3 kW immersion heater rated at 230 V.
What is the maximum mains water pressure?
The maximum stated mains water pressure is 10 bar, with an operating pressure of 7 bar.
What warranty is provided?
The supplied specification states a 1-year warranty.
Joule Cyclone Standard Indirect Short 250L at a Glance
The Joule Cyclone Standard Indirect Short 250L combines 247L actual capacity, LDX 2101 stainless steel construction, a 26.55 kW 316L stainless steel primary coil, one 3 kW immersion heater and dense PU foam insulation. With a 7 bar operating pressure, 10 bar maximum mains water pressure and testing to BS EN 12897:2016, it is suited to large residential and light-commercial indirect unvented hot water applications.
