Within this study bioplastics – bio-poly(ethylene) and poly(trimethylene terephthalate) – i.e. polymers based on renewable resources, are comprehensively evaluated and tested as to their principle applicability as absorber mate-rial in swimming pool solar collectors. Investigations showed that the considered bioplastics possess a high potential for application in solar thermal devices in general. However, further optimization, especially of long-term performance and maximum operating temper-ature by tailoring molecular and supramolecular structure as well as by addition of additives and fillers is required.