The SLU series are all-glass evacuated tubular collectors with metal U tubes.  Fluid circulates from the header to the bottom of the tubes, then back up.

European certification, efficiency and durability testing results may be downloaded. 

Copper U tubes can stand high working pressures-up to 6 bar (0.6 Mpa) and have the highest efficiency of the solar panel only units.

· Graded Al-N/Al selective coating, high energy absorption and low heat transfer losses

·  highly evacuated with pressure ≤5×10^-2 Pa in the space between outer and inner covers, so no heat loss

·  High transparency with boron silicon glass, high resistance to cold water shock

·  High 6 bar pressure

·  12 tube panels can be joined in series

·  Use for pools, thermosiphon systems

·  Use in pressure split systems