● R290 / R32 Low GWP Green Refrigerant To reduce carbon emission to the environment and curb global warming, O.S.B.develops R290 air to water heat pump. With many advantages such as low carbon emission and high efficiency, R290 refrigerant is recognized as a refrigerant with the most development potential in the industry, which contributes to the reduction of carbon emission and help achieve the global goal of carbon neutrality. ●  High Efficiency A+++ Energy Level O.S.B. Air to Water Heat Pump is specially developed with the most cutting-edge heat pump technology and modern design to meet stringent requirements for efficiency, stability and quietness. Not only  use R290 green gas and inverter technology, but also is rated with A+++ energy label. With top energy rating A+++, the unit is energy efficient and can greatly reduce energy bills for users ● Full DC Inverter Technology Perfectly combines eco-friendly R290 refrigerant and inverter technology to produce efficient house heating/cooling and hot water even under extreme cold climate. ●  Stable Running at -25℃ Ambient Temperature Thanks to the unique Inverter EVI technology, can operate efficiently at -25°C, maintain high COP and reliable stability. Intelligent control, any weather available, automatic load adjust under different climate and environment to satisfy the demands of summer cooling, winter heating and hot water throughout the year. ●  Noise Reduction Technology O.S.B. dedicates to creating super quiet running environment for the user. DC inverter heat pump adopts multiple noise reduction technologies, every product has been repeatedly tested and optimized. ●  Smart Mobile WIFI APP The intelligent controller is used to realize the linkage control between the heat pump unit and the terminal application to improve the operation efficiency.  Through the WIFI APP, users can operate their devices from their smartphones anytime and anywhere. ●  Unique Functions and Protections There are multiple intelligent functions: memory function/ timer/ temperature control/ malfunction detect and 4-way protections: water lack protection/ system pressure protection/ abnornmal alert/ brust protection on heat exchanger ● OEM & ODM ▷ Style design ▷ Casing material: such as sheet metal material (flat/wrinkle/matte enrolled/flosted/flash) ▷ Add your LOGO ▷ Packing boxes