Stainless steel unvented cylinders

A comprehensive range of high performance stainless steel unvented cylinders for those on a budget, with fantastic features and benefits.

• Premium grade duplex stainless steel providing superior performance
• Direct and Indirect models 60 – 300 litres
• Renewable options including Solar Direct, Solar Indirect and Heat Pump models 150 – 300 litres
• Pre-plumb packages available on direct, indirect and heat pump models
• 90 degree elbow on hot water draw off
• Compression fittings as standard for ease of installation
• Corrugated coil for maximum heat transfer
• Optional titanium immersions available for commercial applications
• External expansion for ease of servicing
• 25 year guarantee

We provide an MCS Umbrella Scheme service which includes free heat pump training for installers.

The course is held in our dedicated training centre at our head office in Glenrothes, Fife. It is specifically designed for plumbers and heating installers looking to enter the rapidly growing heat pump market.

These courses provide hands-on experience of heat pump products, giving participants an in-depth understanding of the installation process, where you will gain:

• In-depth heat pump knowledge
  • Learn everything there is to know about installing heat pumps, including both air source and ground source heat pumps
• Hands-on experience from industry experts
  • Gain practical skills through interactive training sessions led by industry professionals.
• MCS Accreditation
  • Once completed, you’ll gain access to the MCS Umbrella Scheme, through our training partner Alto Energy, which removes the hassle of completing the MCS accreditation & associated paperwork yourself.
• Become an Assured Installer
  • Have leads provided and attract customers looking for renewable heating solutions.

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Click here for further details on the training, MCS Umbrella Scheme and register your interest in one of our courses held throughout 2025.

The STEELflow range is supplied with all the necessary components required to install the unit including;

Inlet Combination Control Set Pressure incorporating (Supplied)
• Pressure Reducing Valve set at 3 Bar
• Balanced Cold Feed set at 3 Bar
• Expansion Relief Valve set at 6 Bar
Temperature and Pressure Relief Valve
7 Bar/95 degrees C (Fitted)
Tundish (Supplied)
90 degree elbow on hot water draw off
3kW Immersion Heater – Primary Heat Source (Direct models – Fitted)
3kW Immersion Heater – Back Up Heat Source (Fitted)
Expansion Vessel (Supplied)
Dual Control and Overheat Thermostat (Indirect models – Supplied)
Single High Limit Thermostat (Solar and HP models – Supplied)
Two Port Motorised Zone Valve (Indirect models – Supplied)

Compression fittings are supplied fitted on all the STEELflow cylinders to provide a quicker installation process.