Downloads
Consumer Information
The Consumer Booklet covers everything the customer needs to know about the all new Willis Solasyphon and how it works.
Download Consumer informationTrade Information
The Trade booklet takes a more in depth and technical look of the workings and installation of the Willis Solarsyphon.
Download Trade informationTechnical Instructions
The Technical Instructions provide you with installation instructions for the Willis Solasyphon with your existing Pressurised or Vented water heating systems.
Download technical instructionsPerformance Evaluation
Independent Performance Evaluation Report prepared by Dr Jayanta Deb Mondol and Dr Mervyn Smyth Centre for Sustainable Technologies, School of the Built Environment, Ulster University.
Download Performance EvaluationOperating Manual
Operating manual. Describes how to get the most from your solar thermal system, intended for general guidance.
Download Operating Manual