Kingspan Rainwater


The Domestic Envireau Rainwater Harvesting system has been designed as a low cost installation for self-build projects and residential developments. BBA certified, it works by taking the rain from your roof gutters, filtering out the leaves and debris and storing the water in an underground tank. This is then pumped into the house to be used for non-potable applications such as toilet flushing and washing machines. If the tank runs empty, the system automatically switches to mains supply. Simple.


  • Easy to install, simple to maintain, automatic in operation; the Domestic Envireau System has been developed to provide the homeowner with a ‘fit-and-forget’ system, ensuring an automatic supply of harvested rainwater.
  • Designed to be as user-friendly as possible, the system utilises much of the existing pipework within the building. The main requirement being the installation of a rainwater storage tank with internal pump, selected to meet the roof area’s water catchment yield and household requirements.
  • KingspanWater Envireau can reduce water consumption in domestic applications by 50%
  • Authorities increasingly expect applications to demonstrate Sustainable Drainage (SUDS)
  • Achieves credits that are required for compliance with the Code for Sustainable Homes.
  • Also Reduce mains water use fulfils the new Part G 2009 Building Regulations
  • Money saved though reduced water bills means the Envireau system can payback its purchase costs.

rainwater-harvesting-gravityGravity System

The Gravity System is ideal for domestic applications.

It has a major advantage in that in the event of a power failure on site (or the rain stocks running dry) the system will automatically switch to mains supply to ensure a continuity of service.

The header tank (not supplied) contains two independent valves operating both the mains and rainwater supply.

The system will always draw on rainwater first and gravitate to the required applications.



rainwater-harvesting-directDirect System

The Direct System is also suitable for domestic applications. This system is used where it is impractical to have a header tank for example in homes that have converted attic spaces and no room for a header tank. Therefore filtered rainwater is pumped direct from the holding tank to the various appliances.

When the holding tank is running dry there is a small automatic charge of mains water into the storage tank to ensure the system never runs dry. The main advantage of this system is that rainwater is delivered to the appliances at mains pressure (3.5 bar).