In order to ensure energy efficiency and to prolong the life of the water heater, one needs to take into consideration various factors. When a water heater starts to fail, the malfunction is usually apparent due to the water heater making strange sounds or water being too hot, or not hot enough. Before your water heater reaches this stage, there are a few preventive measures that can be taken which will not only prolong the life of the water heater but also help in saving energy. According to the EERE, by reducing the thermostat of your water heater by 10˚F you can save up to 5% of your energy costs. Reducing the heat of the water also helps in reducing the slow mineral buildup and corrosion that can occur in water pipes.