Solar heaters,solar water heater,assistant tank,filling tank Standard:CE/CCC/ISO9001-2008 Capacity: 5L,80L,10L,20L. Solar Heater Assistant TankUsed in non pressure solar water heater system and instant heating solar water heater system.Make up water automatically,and stop making up water itself when the water in the tank is full.Capacity: 5L,80L,10L,20L.