The 150L SOL TWIN Slim C is a slim-profile stainless-steel indirect unvented cylinder with twin coils, designed for combined solar thermal and boiler or heat-pump systems. With a stated capacity of 150 litres and approximately 147 litres usable capacity, it provides a practical domestic hot water storage solution for homes requiring flexible integration of renewable and conventional heat sources.
Featuring 316L stainless-steel twin coils, an LDX 2101 stainless-steel cylinder and dense PU foam insulation, the SOL TWIN Slim C is designed for efficient heat transfer, durability and reduced standby heat loss. Its slim vertical profile makes it particularly suitable for properties with limited plant-room depth or restricted cupboard space.
150 L Capacity
Twin Coil Solar
316L Stainless Steel
LDX 2101 Stainless Steel
BS EN 12897:2016
Key Highlights
Applications & Suitability
- Homes using solar thermal with a boiler or heat pump as a backup or secondary heat source.
- Properties with limited plant-room depth requiring a slim vertical cylinder profile.
- Renovation and retrofit projects integrating renewable heat sources.
- Medium households with approximately 1–2 bathrooms and moderate hot water demand.
- Domestic installations requiring flexible connections for solar and conventional heat sources.
- Properties where stainless-steel construction and reduced standby heat loss are important considerations.
Key Specifications
| Model |
SOL TWIN Slim C (150 L) |
| Capacity |
150 L (actual approximately 147 L) |
| Cylinder Material |
LDX 2101 Stainless Steel |
| Coil Material |
316L Stainless Steel |
| Number of Coils |
2 – Solar + Primary |
| Coil 1 Rating |
Approximately 20–26 kW (primary) |
| Coil 2 Rating |
Approximately 10–25 kW (solar) |
| Coil Surface Areas |
Varies by model |
| Number of Immersions |
1 |
| Immersion Specification |
3 kW @ 230 V |
| Thermal Insulation |
Dense PU Foam |
| Foam Thickness |
0 – Factory Applied |
| Outer Casing |
Coated Mild Steel |
| Maximum Mains Water Pressure |
Approximately 10 bar |
| Operating Pressure |
Approximately 7 bar |
| Operating Temperature |
Approximately 60 °C |
| Safety Valve Temperature |
Approximately 90 °C |
| Tested To Standard |
BS EN 12897:2016 |
| Heat Loss |
Model dependent, typically 1.3–2.5 kWh/24h |
| Unit Weight Empty |
Approximately 34–45 kg |
| Unit Weight Full |
Approximately 184–245 kg |
| Warranty |
1 Year |
Twin-Coil Solar & Primary Heating
The SOL TWIN Slim C features two separate 316L stainless-steel coils designed for different heat sources. This configuration allows the cylinder to be integrated with solar thermal alongside a conventional primary heat source such as a boiler or heat pump.
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Primary coil: approximately 20–26 kW.
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Solar coil: approximately 10–25 kW.
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Coil material: 316L stainless steel.
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Number of coils: 2.
The supplied specifications identify the coil ratings as model-dependent ranges, so actual coil performance should be confirmed against the relevant product specification before installation.
Slimline Design for Restricted Spaces
The slim vertical profile of the SOL TWIN Slim C makes it suitable for homes and properties where available plant-room or cupboard space is limited. Its compact footprint can help when planning domestic hot water storage within restricted installation areas.
With a stated 150-litre capacity and approximately 147 litres usable capacity, it is positioned for medium domestic households with moderate hot water requirements.
LDX 2101 Stainless-Steel Cylinder
The cylinder uses LDX 2101 stainless steel, providing a corrosion-resistant material for domestic hot water storage. The twin heat exchangers use 316L stainless steel, supporting durable heat-exchange construction.
A coated mild-steel outer casing provides the external casing, while dense PU foam insulation is used to help reduce standby heat loss.
Immersion Backup Provision
The SOL TWIN Slim C includes provision for one immersion heater specified at 3 kW @ 230 V. This provides an electric backup or boost option alongside the cylinder's indirect heat-source connections.
Insulation & Heat Loss
The cylinder uses dense PU foam insulation to help minimise standby heat loss. The supplied specification gives a model-dependent heat-loss range of approximately 1.3–2.5 kWh/24h.
Because the supplied heat-loss figure is model dependent, the exact heat-loss value should be checked against the final model specification when required for system calculations.
Pressure & Temperature Ratings
The supplied typical specifications indicate a maximum mains water pressure of approximately 10 bar and an operating pressure of approximately 7 bar. The typical operating temperature is approximately 60 °C, with a safety valve temperature of approximately 90 °C.
~10 bar
Maximum mains pressure
~7 bar
Operating pressure
~90 °C
Safety valve temperature
BS EN 12897:2016
The supplied specification states that the SOL TWIN Slim C is tested to BS EN 12897:2016. It is supplied with a 1-year warranty.
Ideal For
- Homes combining solar thermal with a boiler or heat pump.
- Medium households with moderate domestic hot water demand.
- Properties with limited plant-room depth or restricted cupboard space.
- Renovation and retrofit projects integrating renewable heat sources.
- Domestic systems requiring separate solar and primary heat-source connections.
- Installations where stainless-steel construction and low standby heat loss are priorities.
Frequently Asked Questions
What is the capacity of the SOL TWIN Slim C?
The cylinder has a stated capacity of 150 litres, with approximately 147 litres usable capacity.
Is the SOL TWIN Slim C a twin-coil cylinder?
Yes. It features two separate 316L stainless-steel coils for solar and primary heat-source connections.
Can it be used with solar thermal?
Yes. The SOL TWIN Slim C is designed for combined solar thermal and conventional heat-source systems.
What material are the coils made from?
Both coils are specified as 316L stainless steel.
What material is the cylinder made from?
The cylinder is constructed from LDX 2101 stainless steel.
Does it have an immersion heater provision?
Yes. It has one immersion provision specified at 3 kW @ 230 V.
What is the typical heat loss?
The supplied specification gives a model-dependent heat loss of approximately 1.3–2.5 kWh/24h.
What is the warranty?
The SOL TWIN Slim C is supplied with a 1-year warranty.
150L SOL TWIN Slim C Twin Coil Indirect Unvented Cylinder
The 150L SOL TWIN Slim C combines approximately 147 litres of usable hot water storage with twin 316L stainless-steel coils, LDX 2101 stainless-steel construction, dense PU foam insulation and a 3 kW immersion provision. Its slim vertical profile makes it suitable for space-restricted domestic installations, while the twin-coil design provides separate connections for solar thermal and a conventional primary heat source such as a boiler or heat pump.
