Backup in a Box

What is the Backup in a Box?

The Rain Backup in a Box® is a simple mains water backup device designed for rainwater harvesting systems. When the rainwater level in your tank becomes too low, the system automatically adds a small amount of mains water. This ensures your appliances always have a reliable water supply.

The unit typically adds around 200–250 litres of mains water to the tank. It does not completely refill the tank. Instead, it provides enough water to keep your system working until rainfall replenishes the tank.

Backup in a Box is commonly used with direct feed rainwater harvesting systems, where a submersible pump supplies water directly from the tank to appliances such as toilets or washing machines.

How Does the Backup in a Box Work?

A rainwater harvesting system collects rain from the roof and stores it in a tank, usually underground. A pressure-sensitive pump then delivers the stored rainwater to the home whenever water is required.

When the water level inside the tank becomes critically low, the Backup in a Box system activates automatically.

1. A level sensor detects when the rainwater level drops.
2. The control unit opens a solenoid valve.
3. Mains water flows safely into the tank through an approved air gap.
4. A small amount of water enters the tank to maintain supply.

This process ensures your home continues to receive water even during periods of low rainfall.

Key Features of Backup in a Box

Backup in a Box offers several advantages for rainwater harvesting systems:

• Simple plug-and-play installation
• Designed for direct feed rainwater systems
• Adds a controlled amount of mains water when levels fall
• Audible alarm if water continues running
• Quiet and efficient operation
• Safe 12V power supply
• Complies with UK water regulations

The unit replaces several separate components with one compact control system, making installation easier for builders and installers.

NSF Reg 4 Approval

The Rain Backup in a Box® is NSF Reg4 Approved, which means it meets the strict standards required by UK water authorities.

NSF Reg4 approval confirms that the product has undergone extensive testing and complies with UK water regulations. As a result, water inspectors across the UK recognise the system as a safe and compliant solution for mains water backup.

The NSF Reg4 approval number for the Backup in a Box is 2510623.

Why a Mains Water Backup is Important

Rainwater harvesting can reduce mains water consumption by up to 50% in many homes by supplying water for toilets, washing machines and outdoor use.

However, during long dry periods the rainwater tank may eventually run low. A mains backup system solves this problem by ensuring your system always has a minimum water level.

Backup in a Box provides a simple, reliable and regulation-compliant solution to keep your rainwater harvesting system operating all year round.