Model ZR9W-250VF3d Heating capacity KW 2.7 Water tank volume L 250 Power input W 820 Running current A 3.8 Power supply V/Ph/Hz 220~230/1/50 Compressor number 1 Compressor type Rotary Rated outlet water temperature ℃ 55 Max outlet water temperature ℃ 60 Air volume M³/H 450 Duct diameter mm Φ150 Noise dB(A) 49 Water inlet size/outlet size Inch G3/4'' Net dimensions mm Φ600*1790 Package dimensions mm 660*660*1950 Net weight KG 90 Gross weight KG 105 FAQ 1.What is the difference between internal/ external refrigerant coil of all in one heat pump ? Internal refrigerant coil mean:Heat conduction in the water tank direct contact the water.External refrigerant coil mean:Indirect heating outside of the stainless steel inner tank.Regarding the internal refrigerant coil, the heating speed is faster, much more convenience for customers use the hot water. But for bad water quality area, we do not suggest customers choose it. Regarding the external refrigerant coil, the coils do not contact the water diectly.Coils are not easily oxidized or corroded.But the heating speed is slower than internal refrigerant coil. 2.Can you tell me the heating time of your all in one heat pump? It needs to be heated from 30 to 60 degrees. Water tank volume*（Outlet water temperature - inlet water temperature）/860/Heating capacity=Heating time.Taking ZR9W-200TV model as an example, the heating capacity of it is 3.3kw, so 200 * (60-30) / 860 / 3.3 ≈ 2.1 hours, so the unit will take about 2.1 hours to heat from 30 ℃ to 60 ℃.