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Rainwater Harvesting

Rainwater harvesting involves collecting rainwater from the roof using the existing guttering and drainage system, then storing it for reuse. A rainwater harvesting system can reduce the amount of mains water used for suitable purposes and may also help reduce the amount of surface water entering drainage systems during periods of heavy rainfall. With more UK homes using water meters, harvesting rainwater can also help reduce household water consumption.

The amount you can save will depend on your water usage, the size of the system and how the collected water is used. Rainwater harvesting can be particularly useful in commercial properties where larger volumes of water may be required, although domestic systems can also reduce reliance on mains water.

There are two main types of rainwater harvesting system: direct and indirect systems. Direct systems collect rainwater and pump it directly to the point of use. A mains water backup may be connected to the system so that water remains available when the rainwater tank is low.

Indirect rainwater harvesting systems, also known as gravity or boosted systems, use an additional header tank. Water can then be supplied by gravity, with a pump used where additional pressure is required.

Rainwater harvesting can help households and businesses use water more efficiently. Collected rainwater is commonly used for purposes such as flushing toilets, watering gardens and washing vehicles. However, harvested rainwater should not generally be used for drinking or food preparation unless it has been treated appropriately for potable use.

During periods of heavy rainfall, storing some roof water can reduce the amount entering surface water drainage systems immediately. During drier periods, stored rainwater can also provide an alternative water source for gardens and other suitable uses, depending on how much water has been collected.

The simplest rainwater harvesting system is a water butt, which is a container connected to a rainwater downpipe. This can be suitable for collecting water for garden use or washing vehicles. Larger gravity-fed or pumped systems connected to household appliances or toilets are more complex and will generally cost more.

The average supply-only cost of a domestic rainwater harvesting system may be around £2,500, while installation can add approximately £2,000-£3,000 depending on the system and work required. A 3,000-litre system may cost from around £2,000, while a 5,000-litre system may start from around £3,000. Underground storage tanks can cost more because excavation and groundworks may also be required.

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