Flate Plate Collector  ;solar controller  = sensors Should have  temperature, flow rate, pressure and illuminance sensors, Feature Should have data logger and USB interface, Feature  hot water circuit with buffer tank, pump and plate heat exchanger, Data logger Capable of storing  ≥14  million readings, Feature( additional) 4 bimetallic thermometers;Collector:- = Type Flat-plate n/a, Height / Width / Depth 2035 / 1233 / 80 (mm), Aperture area 2.35 m2, Absorber area  2.32 m2, Overall collector area  2.51 M2, Weight (empty)38 kg, Inner Tube Diameter 50 mm, Tube Thickness  2 mm, Number of tube 20 number, Feature Should allow the user to change the collector whenever needed, feature Should have ambient air thermometer attached with it;Performance:- = Solar glass transmission  91%, Solar radiation absorption 95 %, Solar radiation emission 5%, Max operating pressure 10 bar, Stagnation temperature 210 oC, Certification CE 0036 & Solar Keymark, ;Storage Tank:- = Volume 200 litre, Insulation material Polyurethane foam/ Glass wool / Rock wool n/a, Insulation thickness ≥60 mm, Temperature sensor (4 sensors placed to the tank longitudinally)  k-type/ or other,;Buffer tank:- = volume ≥70 litre;Materials & construction:- = Absorber Sheet Aluminum, Absorber plate coating  Sunselect (selective), Absorber tube  Copper, Absorber tube joints Laser welded, Frame Aluminum Extruded sides / sheet rear, Glazing Safety glass (low iron), 3.2mm, Rear insulation  40mm,Solar fluid Water / propylene glycol, Flow / return connections DN 16 (G3/4”), Normal flow rate 3.8 L/min, Heat Loss max 0.7 W/m2 ,Thermal Expansion 3.3 x 10 -6 m,;