ESS has provided Heat Pumps to the UK commercial market since 2000. The latest generation of Heat Pumps can recover heat from ambient air and maintain full output at outdoor temperatures as low as -20°C providing hot water for heating and washing. On average, over 80% of energy costs in UK households is used for heating water. In place of conventional HFC type refrigerants, CO2 is recovered from industrial waste as a heat transfer fluid, enabling the heating of water to 65° without electric heat. COPs in excess of 4 are achieveable meaning that energy bills can be substantially reduced, enabling a fast pay back, particularly if replacing oil or electric system.