Height 1810 Internal Diameter 550 External Diameter 650 Insulation 50 Drain 3/4 female 200 Cold Feed 1 female 520 Solar Coil Outlet 3/4female 350 Solar Coil Feed 3/4female 540 Solar Coil: Stainless Steel (diameter) 22 Boiler Coil Outlet 3/4female 860 Boiler Coil Feed 3/4female 1075 Boiler Coil: Stainless Steel (diameter) 22 1Gravity Coil Outlet none 1Gravity Coil Feed none Gravity Coil: Stainless Steel (diameter) none 3Kw Immersion 1 650 3Kw Immersion 2 1445 Temp Sensor Pocket 11/2 female 650 Temp Sensor Pocket 21/2 female 1545 Double Stat Temp Sen. Pocket 800 Secondary Return3/4female 1445 T & P Valve 1/2 female 1545 Hot Draw Off 1 female 1810 Standard Heat Loss per 24 Hours (kWhr) 2.79 Dedicated Solar Volume () 210 Dedicated Solar Volume (%) 52.5 EN12897 Solar Heat Exchanger (kW) 41.3 Solar Coil (m) 1.5 EN12897 Boiler Coil Exchanger (kW) 33.1 Boiler Coil Surface Area (m) 1.2 EN12977 ERP Storage Energy Efficiency Class A