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5.4kw Air Source Heat Pump Water Heater. High Energy Efficiency: COP up to 4.29, consuming 1 kWh electricity for over 3 kWh heat energy. 15-Year Design Life: Core components designed for a service life of more than 15 years. Multiple Tank Options: Pressurized water tanks available from 150 to 500 liters in various materials. Smart Control System: Microcomputer control with smart 485 interface for remote intelligent control. Safe & Eco-Friendly: Water-electricity separation design, no open flames or pollutant emissions.