The Nicoll Heat Recovery Unit preheats the cold water at the mixer tap using the energy from the hot water that is discharged. The simplicity of its operation ensures that there are no technical failures. The owner pays for his product in 6 years thanks to a 20% reduction in hot water consumption without affecting his comfort. This investment is an impactful action in favor of the climate. With only 25kg CO2 necessary to produce it and the 20% energy recovery at the shower level, it only needs an average of 150 showers (average in Europe) to amortise the carbon footprint of the product.