Minus 7: the hybrid energy harvester

The Minus 7 hybrid energy harvester is a new addition to the renewable energy market. Mark Wozencroft, Managing Director, of Minus 7, explains the benefits of the system that provides all year round heating and hot water.

The Minus 7 hybrid energy harvester comprises an endothermic roofing system, a solar energy processor and a thermal store. The endothermic roofing system is made up of tile planks that are a 2.5mm thick, uniform profile, aluminium extrusion, dressed in a powder-coated, hard-wearing finish. These hollow endothermic tile planks are flooded with a heat transfer fluid, which creates a flooded roof system. An endothermic reaction harvests thermal energy and solar thermal energy from the ambient surroundings which is then processed and sent to the thermal store to be drawn off as required. The system can provide a building with all its hot water and heating needs. Designed and manufactured in the UK the Minus 7 hybrid energy harvesting system is a solar-assisted heat pump technology. The NCM (SAP) identifier for this product is Minus 7 SEP3G10 1/2/3.

The system for one house requires around 20m2 of roofing tiles which would typically cover one face of an average sized house. However due to the enhanced quality of the aluminium tile planks as a roofing product users may choose to adopt inactive tiles planks for the rest of their roof. All the required elements are available such as verge tiles, bay tiles, ridge tiles and even ice planks. The system also makes use of a bubble seal and a flipper seal, both of which are designed to keep out driving rain and high winds expected in future weather systems.

There are no unsightly bolt-on panels, which means that the system is visually unobtrusive and can not be readily distinguished from any other normal roof from the street. Also because it’s primarily harvesting thermal energy it does not require a south facing roof.

The system is entirely autonomous and completely separate from the house heating system. It works by delivering low-grade heat to a thermal store buried in the ground external from the house. There are no other support mechanisms, such as a boiler, required. The system not only reduces the quantity of hydrocarbon required to deliver a particular thermal load but will also deliver that heat at a significantly lower unit cost (typically at 50% of the equivalent gas fired cost). This is in line with Government strategy to provide low carbon solutions and affordable warmth.

The Minus 7 hybrid energy harvester is incredibly economical, with control systems that endeavour to run the heat pumps as little as possible – for instance, in summer, they may not run at all. The system is also extremely durable due to the commercial quality of build. It will last for at least 50 years and is maintenance free for its entire life. It is suitable for many applications from domestic and social housing right through to aeronautics, farming, commercial and leisure.

As energy prices continue to rise year on year the Minus 7 hybrid energy harvester offers a solution that will help users to keep their costs down whilst still providing affordable, comfortable levels of heating and hot water. In short, as far as heating technology goes, the leap between what is currently available on the market and the Minus 7 hybrid energy harvester system is as revolutionary as when we first transitioned from steam to combustion engines.