Shanghai has another new move to promote home energy saving - to the air to heat. The country's first mass production of integrated indoor air to heat pump water heater assembly line was recently completed in Shanghai, this product is usually 70% energy saving than electric water heaters. It is reported that this air to heat pump water heater initial investment of 5,000 yuan, is gas, natural gas, electric water heaters 3-5 times, but its lower daily operating costs. Experts estimate that if the 120 liters of water heated from 15 degrees Celsius to 55 degrees Celsius, gas water heater required operating costs 1.74 yuan, 1.26 yuan for natural gas heaters, electric water heaters 3.60 yuan, 1.48 yuan for solar water heaters, and air to heat pump water heaters Only 0.95 yuan or so. Zhejiang Aikang central heat pump water heater market by Zhejiang Aikang Electric Technology Co., Ltd. R & D and manufacturing of a highly efficient environmentally friendly energy-saving home and commercial central heat pump water heaters and central heat pump hot water unit products have been officially put on the market. It is reported that this series of products using a new environmentally friendly material, in addition to the general functions of the general central air conditioning, but also through the inverse Carnot cycle principle, consumes little energy to absorb large amounts of heat from the air heating tap water, and traditional Of the electric water heater compared to saving more than 75%, but also from day and night, sunny rainy days or winter snow days; plus the use of efficient energy storage devices, even temporary power outages, the production of hot water for life can also supply.