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Click on the TV above to watch a Graf video on rainwater harvesting
New video showing assembly of a Graf Carat tank

Download our fitting instructions for the Carat system

Rain Back Up in a Box® 

Automated mains water backup another eco-innovation from Rainwater Harvesting Limited

Rain Back Up in a Box® This 'plug and play' product takes the complexity out of solenoid valve and float switch driven mains water back up or top up systems.

• No complex rewiring of float switches and solenoid valves

• Plug in and go controls with 12v power supply

• All parts including tundish contained in a tidy insulated box

• Pressure reducing valve for incoming mains

The Rain Backup in a Box® replaces a bundle of disconnected components with a single wall mounted unit, one electric plug to a wall socket, mains water input and a pipe to the rainwater storage tank.  

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 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 photo 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.  

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Rainwater Harvesting Limited invents, innovates and develops environmental products for tomorrow's greener world.