Hi there, It was designed for internal use only. However, the Hep2O product guide states that if it is installed outdoors or in an unheated environment, it should be protected from frost in accordance with BS 5422, BS6700 and BS EN 806, Water Bylaws and Building Regulations Approved Document L. Hep2O should be protected from the effects of ultraviolet radiation. If insulation has been installed to avoid freezing this provides adequate protection. Where insualtion is not used, paint or covering is recommended. Please don't hesitate to get in touch if there is anything else we can help you with. Many thanks, the Hep2O team
Answered by: Liam at Wavin
Date published: 2019-09-21