Terra Spiral is an innovative geothermal basket system designed to recover heat from the ground. The baskets are made from a special polymer resin and contain a monopropylene glycol-based coolant that recovers the heat energy via the spiral piping. The energy is then converted by a heat pump using glycolated water or water on its own to heat or cool homes and business premises via underfloor heating, radiators or fan-assisted convection heaters, and produce hot water or even heat swimming pools.