Height 1530 Internal Diameter 420 External Diameter 520 Insulation 50 Drain 3/4 female 200 Cold Feed 1 female 300 Solar Coil Outlet 3/4female 200 Solar Coil Feed 3/4female 470 Solar Coil: Stainless Steel (diameter) 22 Boiler Coil Outlet 3/4female 769 Boiler Coil Feed 3/4female 1019 Boiler Coil: Stainless Steel (diameter) 22 1Gravity Coil Outlet none 1Gravity Coil Feed none Gravity Coil: Stainless Steel (diameter) none 3Kw Immersion 1 620 3Kw Immersion 2 none Temp Sensor Pocket 11/2 female 515 Temp Sensor Pocket 21/2 female 1275 Double Stat Temp Sen. Pocket 724 Secondary Return3/4female 1175 T & P Valve 1/2 female 1275 Hot Draw Off 1 female 1530 Standard Heat Loss per 24 Hours (kWhr) 1.4 Dedicated Solar Volume () 110 Dedicated Solar Volume (%) 55 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