Height 1600 Internal Diameter 460 External Diameter 560 Insulation 50 Drain 3/4 female 250 Cold Feed 1 female 350 Solar Coil Outlet 3/4female 250 Solar Coil Feed 3/4female 520 Solar Coil: Stainless Steel (diameter) 22 Boiler Coil Outlet 3/4female 820 Boiler Coil Feed 3/4female 1070 Boiler Coil: Stainless Steel (diameter) 22 1Gravity Coil Outlet none 1Gravity Coil Feed none Gravity Coil: Stainless Steel (diameter) none 3Kw Immersion 1 670 3Kw Immersion 2 none Temp Sensor Pocket 11/2 female 565 Temp Sensor Pocket 21/2 female 1326 Double Stat Temp Sen. Pocket 775 Secondary Return3/4female 1225 T & P Valve 1/2 female 1326 Hot Draw Off 1 female 1600 Standard Heat Loss per 24 Hours (kWhr) 1.74 Dedicated Solar Volume () 135 Dedicated Solar Volume (%) 54 EN12897 Solar Heat Exchanger (kW) 35.86 Solar Coil (m) 1.3 EN12897 Boiler Coil Exchanger (kW) 27.58 Boiler Coil Surface Area (m) 1 EN12977 ERP Storage Energy Efficiency Class A