Showers Low flow shower heads save about 50% of the water a conventional shower requires, or about 2.5 gallons per minute as compared to the conventional 4 or 5 gallons per minute. A good fixture will save water and still deliver a great shower. Using less hot water for your shower also saves energy because less water must be heated for the shower. Aerators can also be added to existing shower heads if you are not ready to replace the entire unit. Various models are available that increase spray velocity, reduce splash, while saving both water and energy.