1). Special compact design; 2). Safe and convenient to use: water and electricity are seperated, avoid any accident caused from leakage of electricity and dry burning. 3). Automatic control: A. High/low pressure protection and insufficient water flow protection;automatic unit on/off timer clock. B. Automatic reversing defrosting function enables, units to work reliably in hard winter. C. Unit runs automatically according to set water temperature. 4). Lcd display controller, convenient to operate and control. 5). Qualified components:branded compressor(copeland, sanyo), emerson expansion valve, high efficient tube in tube heat exchanger, durable and low noise nylon fans. Parameter list: Rated heating capacity: 15 kw / 51195 btu Rated heating input power: 3.4 kw Rated heating input current:7.5 a Cop: 4.4 Power supply: 380v/3p/50hz Niose: 53 db(a) Compressor: sanyo, copeland Refrigerant type: r417a, r407c, r410a Hot water side exchanger: efficient tube in tube heat exchanger Water flow: 2.44 m3/h Water pressure drop: 29 kpa Pipe size: 25 dn Unit dimension: w810*d780*h1050 mm Packing size: w970*d880*h1220 Unit weight: 135 kg