Time to…

join the heating revolution.


It’s here; the next generation of eco-friendly heating.


Winner of Energy Efficient Product of the Year 2014, the Minus7 System delivers premium energy management via a complete building-integrated heating solution. It is the only energy-harvesting product on the market designed specifically for the UK climate.

How it works

Watch our short video which visually
explains the energy-harvesting
process of the Minus7 System.

Inside the SEP

The Minus7 Solar Energy Processor (SEP) is the heart of the system. Here heat from the roof is processed by the heat exchangers and then stored in the hot and cold thermal stores. The SEP also houses the heat pump which upgrades the available heat in the cold store before transferring it to the hot store.


What makes Minus7 so special?

  • Visually unobtrusive

    Our bespoke Tileplanks harvest solar energy without the need for unsightly bolt-on panels.

  • Optimised for the UK climate

    Our system collects energy day AND night, and continues to operate in temperatures as low as minus 7°C

  • Complete integration

    No need for a hot water cylinder or an immersion heater.

  • Remote system monitoring

    Once installed, our expert team monitor your Minus7 System off-site using a non-intrusive service to ensure optimim performance.

Frequently Asked Questions

Does the house still need a hot water cylinder and immersion heater?
No, the Minus7 System provides hot water directly to the taps at 40 – 45˚C.
Do the Tileplanks go on top of the roof?
No, the Tileplanks form the roof.
Can the Tileplanks be installed on just one side of the roof?
Yes, if the building has a roof side facing south, east or west that will be enough exposure for the System to function effectively.
Will the water ever become contaminated?
No, the System uses heat exchangers to warm the water via heat transfer; the water is supplied directly from the mains via a UV purifier, and never stored.
Can I use radiators?
Yes, both low temperature radiators and under floor heat distribution work well with the Minus7 System.
How do I get hot water?
Cold water from the mains goes through the SEP (Solar Energy Processor) where it is warmed by heat transfer from the heat stored by the System.  It can then be topped up if necessary by inline electric heaters to 40 – 45˚c.
Will the roofing structure need to be changed to support the Minus7 Roof?
Standard roof trusses are more than adequate – our Tileplanks interlock to produce one complete structure, which spreads the load at 28kG/m2 when flooded.
Will the building structure need to be changed to accommodate the Minus7 System?
No, but as the product is closely engineered, once the dimensions have been agreed they need to be adhered to, to ensure that the roof fits perfectly.
What are the Thermal Stores made from?
Reinforced GRP, insulated with 200mm of urethane foam in the form of a double skin construction.
What fluid will be stored in the Thermal Stores?
The hot store contains water, the cold store holds a mixture of 30% concentration by volume ethylene-glycol based anti-freeze.

Still have a question that needs answering?

Feel free to call us on 01922 419405 or alternatively complete the contact form and we’ll get back to you.

Explore the full benefits of The Minus7 System


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