... CE Evacuated tube solar water heater (CE,ISO9001,SGS,CCC)1) Designed to accept mains pressure cold water2) Copper coil heat exchanger ... concern for SFD series4) Reliable, efficient, twin-glass solar tubes5) Superior heat preservation with 50 - 65mm polyurethane tank insulation6) ... pcs262.5litersSFD47305818470*2536mm360mm58*1800mm30 pcs327.5 litersEvacuated tube solar water heater (CE,ISO9001,SGS,CCC)