Sigma rainwater unit

Wisy Sigma Unit now WRAS Approved!

Developed by Wisy® AG in Germany, the Sigma domestic rainwater harvesting unit is now WRAS Approved. The Wisy Sigma unit is a neat, compact unit combining ultra-low energy efficient controller, a super-quiet multi-stage pump and automatic mains water back-up system. It is ideal for both new build and retro-fit installations. Obtaining WRAS Approval is a great advantage as…