Heat Pump Water Heaters Why Buy an Energy-Efficient Heat Pump Water Heater? According to ENERGY STAR, water heaters are the second highest source of energy usage in the home. An ENERGY STAR certified heat pump water heater uses 70% less electricity to make the same hot water as a standard electric model, according to ENERGY STAR. They work by drawing heat from the environment and moving it to the water tank to heat the water inside. According to ENERGY STAR, heat pump water heaters offer many benefits, including: Super Energy Efficient: Heat pump water heaters make the same amount of hot water using 70% less electricity. Uses 1/3 the electricity and at 1/3 the cost than conventional electric water heaters. Health and Safety: Heat pump water heaters are safe and reliable. They are also easy to install because they do not require extra venting to remove exhaust gases. Reliability: Heat pumps have been around for decades and are a proven, reliable technology. ENERGY STAR® certified electric water heaters come with a minimum 6-year manufacturer warranty. Eco Friendly: Heat pump water heaters require less energy to make the same hot water, which conserves resources and reduces greenhouse gas emissions.