Astersa, S.A. is a company established with the aim of manufacturing, installing and selling the most varied systems and components required for the generation and utilization of renewable energies, among them, solar thermal panels Nowadays, ASTERSA has the most advanced technological means and fully automated manufacturing systems; and it operates satisfactorily in the annual production of 220,000 m2 (154 MW) of Solar Thermal Collectors, for applications such as domestic hot water (DHW), support to central heating, industrial hot water (IHW), in-floor radiant heating, swimming pools, etc. Faithful to our objective of providing the highest guarantee to our products, we use cutting edge technology and automation in all the manufacturing processes of our solar thermal collectors: • Copper pipe straightening and cutting • Flaring in the collector pipes • End shaping • Grate mounting and welding • Hydraulic testing • Ultrasonic welding of the absorber surface with the grate • Anodised aluminium cutting and punching In order to guarantee the correct operation of our collectors, we carry out 100% of the compliance testing at a pressure of 15 bars. Our aim is to: • Commit ourselves to excellence and to our clients • Provide a unique service • Reduce after-sales service and maintenance as much as possible Astersa s/a works with high quality raw materials in all its versions, with the objective of providing the highest possible guarantee (10 years) and durability to the collectors. Faithful to our commitments , we consider that it is necessary to have raw materials and chemical processes which are toxic-free, 100% recyclable and respectful with the environment. As selective collection surface, we offer the best choice in the market, thanks to its high absortance (95.3%) and its low emissivity (4.7%). With this we achieve: • Higher optical performance • Higher durability of our collectors • 100% recyclable material