What are the affects for heat pump water heaters to environmental protections? They do not require gas, and do not discharge exhausts; they do not require refrigerant that may destroy the ozone layer like traditional heat pump water heaters. Meanwhile, when the COP is above 2.6, they may save 2/3 of power costs comparing to electric water heaters, and may save 1/2 of power costs comparing to gas water heaters. This is because whenever 1 degree amount of power costs decrease s, 1.5 lbs. of CO2 reduces; the destruction of the ozone layer is thus reduced. What are the advantages of heat pump water heaters? Safe: No combustion→ no exhaust discharged, so that to be dismissed from “gas explosion” and “gas poisoning”; they also contain safety devices to prevent from power leakage, and thus are secure. Comfortable: Provided with automatic constant temperature storage tanks, allowing the hot water to remain its warmth. Cost-saving: Saving 2/3 heating power costs (electric water heaters) or 1/2 gas fees (comparing with gas water heaters). Where are possible locations to install heat pump water heaters? They are energy-saving water heaters that are rather suitable for indoors of apartment balconies, suites, households, and offices; additionally, their general power consumption of 220V/ 770W. One of the reasons why they are suitable for indoor space is that the air in the kitchen is usually hot and humid, especially when cooking; since heat pump water heaters contain dehumidifying capacity, they are very useful when installed in the kitchen.