Household Mini Electric Water Heater Instant Tankless Water Heater Heating MachineBlack EU Plug 220V 4000W Condition: Item Type: Water Heater Material: PC, Copper Frequency: 50 - 60HZ Remote Control Battery: 2 x AAA Battery (Battery Not Included) Weight: Approx. 1724g / 60.8oz Size: Approx. 24x13.5x6.5cm / 9.4x5.3x2.6in Wire Requirements: ≥ 2.5mm² copper core wireAir Switch Requirements: ≥ 25A Electricity Meter Requirements: electronic electricity meter ≥ 30A, mechanical electricity meter ≥ 20A Water Pressure Requirements: tap water basically meets the requirements, and booster pump can be added if it is too small. Operation Method: Press and hold the shutdown key, and after 6 seconds, it will automatically switch to gear mode, and then press 6 seconds to switch the frequency conversion mode. Advantages of frequency conversion mode: the machine only needs to set the temperature, and the system automatically changes the output power to reach the set temperature, making the operation more convenient and the setting more intuitive. Advantages of gear mode: the gear is 4 gears, and the fixed power of each gear is 1000 / 2000 / 3000 / 4000W, respectively P1 / P2 / P3 / P4, 1 to 4 gears. The gear can be controlled by people, the system does not need to calculate the power, and the low gear can be used in spring, summer and autumn. If the home wire is less than the specification of 2.5mm² copper core, the gear mode can be adopted, and the gear 1 to 3 can also meet the needs of ordinary washing, and the low gear can be used to control the power to prevent the wire from burning The conversion setting method of frequency conversion and gear position: 1. Press the power button to turn on the machine (the default is frequency conversion mode when starting up) 2. Then the display shows the marquee 3. Then long press the power button for 6 seconds 4. The display shows P (displaying P is the gear mode) 5. Press the heating button or the cooling button, it can be changed from P1-P4, respectively 1000/2000/3000/4000W, 4 gears 6. Then turn on the water flow, you can work and heat 7. In winter, the water inlet temperature is low, the water flow at the water inlet is slightly reduced, and the heating temperature will keep up 8. The same method: you can change back to the frequency conversion mode