http://www.rainwaterharvesting.co.uk Rainwater Harvesting en-us http://www.rainwaterharvesting.co.uk/mains-water-back-up.php Rainwater harvesting Limited's Rain Back Up in a Box is 'plug and play' product takes the complexity out of solenoid valve and float switch driven mains water back up or top up systems. The Rain Backup in a Box replaces a bundle of components with a single wall mounted unit. Rainwater harvesting plays a large role in reducing the dependence of any building on expensive treated water from the mains. Toilet flushing, clothes washing and any outdoor use of water can be assured by rainwater. In most cases the total mains use of the building can be cut in half. But what happens if rainwater runs out. Every system needs a mains water backup to keep the dependent appliances going. The simplest way is a float switch and solenoid valve; the float switch detects when the rainwater storage tank is empty and opens the electrically-actuated solenoid valve so that mains water flows into the bottom of the tank. When the float switch floats off the bottom of the tank it turns the solenoid valve off. The bulk of the storage tank remains empty ready to admit the water from the next rain shower. Rain Backup in a Box brings these components together ready connected and ready to go. U.K. Building Regulations require that rainwater cannot possibly flow back into the mains water supply. For this reason all mains backup devices must have an air gap where the mains water flows into the rainwater tank. The simplest way to do this is for the mains water to flow through open air into a funnel shaped device called a tundish. It can be seen in the image at the bottom right of the unit. The Rain Backup in a Box is fitted in a frost free area of the building where the occupiers can see and hear it. When the tank supply of water rainwater has run out, any mains water running from the solenoid valve into the tundish can be seen through the transparent cover and can be heard through the aperture at the side. Rain Back Up in a Box is Trade Mark Registered. Trade enquires are welcome. For more information call 0800 074 7234 Rainwater Harvesting Limited invents, innovates and develops environmental products for tomorrow's greener world. Our web shop is RainwaterHarvesting co uk. Full details at www.rainwaterharvesting.co.uk Rain Water Harvesting, Unit A Harrier Park, Southgate Way, Orton Southgate, Peterborough PE2 6YQ, United Kingdom Phone (+44) 1733 405100, fax (+44) 1733 230996, web site http://www.RainWaterHarvesting.co.uk