1.compact pressurized Solar Water Heater 2.5 years guarantee,15 years lifetime. 3.Competitive price and good quality 4.copper Copper coil Pre-heated solar water heater(pressurized) Model:SLD-2  This type is a compact pressurized system. One copper coil inside the tank as the heat exchanger. When water flows into the copper coil, it absorbs the heat of the water in the tank via the copper coil, therefore the water tank is just a heat storage tank.   Features: 1) Use the copper coil as the heat exchanger, according with international fashion trend,it is simple to install and use.2) It takes the advantage of the tap water's pressure. more pressure, more comfortable. 3) It can produce hot water with constant temperature, it is safe and comfortable to use. 4) The water can be heated rapidly, so it can produce the high quality hot water. 5) It can produce more hot water than the general types because it isn't. 

Technical specification
Material of inner tank	Food grade SUS 304 2 B stainless steel, thickness:0.41mm
Material of housing tank	powder coated steel  , thickness:0.35mm
Insulation of tank	55mm high-density import polyurethane foamed
Frame	galvanized steel 1.5mm
Electrical heater	Backup heater 110V/220V 2000W/2500W(optional)
Fittings	304 stainless steel screw
Vacuum tubes details
Vacuum tubes	3.3 Borosilicate glass double wall Absorb layer: AL-N/AL or AL-N/SS/CU (optional) Absorb rate >93%