The Seido 5 has a special curved absorber surface contained within the evacuated tube. This maximizes all day heat production.  Tests show a 10% or more gain in performance due to its ability to generate heat as soon as the sun comes up and until late in the day.  A south facing roof would be the best choice for the Seido 5.  It is possible to rotate individual tubes but not recommended due to resulting absorber surface shading. 

Each Seido Tube is 4 inches across to allow for an extra large absorber surface and produce maximum BTU’s. This tube diameter was developed to achieve high performance and minimize installation time and materials. Virtually all other evacuated tube manufacturers use a much smaller diameter tube and require nearly twice as many tubes to generate similar performance.

The heat pipe design allows for both closed loop and drain back configurations.  Like all SUNDA evacuated tube collectors, the modular design allows for installation by one person.  The Seido 5 is available with two header options, both cylindrical in shape. The standard header has a smooth aluminum finish in brown.  The 'AS' header is of rugged extruded aluminum construction with a modern silver finish.  Please refer to sizing and design help, or contact APD.

                   Standard Header                                                                    'AS' Header