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London Rainwater Harvesting Systems

At KD Pumps, we specialise in the design, supply and installation of environmentally friendly rainwater harvesting systems in London.

From our head office based in Maidstone, our team of highly trained drainage and rainwater attenuation engineers are able to service residential and commercial clients across all boroughs of London.

Rainwater Harvesting Diagram

What is Rainwater Harvesting?

Rainwater harvesting is the process of collecting rainwater for recycling from roofs of buildings, which is then diverted and stored into underground tanks plumbed directly to the guttering system.

By storing your own supply of water, it can be pumped to where it is required to lessen the demand on the mains water system.

The process of rainwater harvesting dates back to the Roman empire however, it has become far less popular in modern times until recently.

Due to change in attitudes towards environmentalism, and recycling, and the fact that a growing population is placing an sustainable demand on the mains water supplies, rainwater harvesting is once again becoming a popular option for many residents living in London.

With rising temperatures and hotter summers, drought conditions are becoming more commonplace.

As a result, the mains water companies are placing restrictions on usage, most notably hosepipe bans during the summer months.

With a rainwater harvesting system in place, any water collected during the wetter months of the year will prove essential to anyone reliant on an uninterrupted water supply, no matter the time of year.

Flushing Toilet Putting Laundry into Washing Machine

London Coverage

KD Pumps installs rainwater harvesting systems throughout London, including the boroughs of:

  • Barking
  • Barnet
  • Beckenham
  • Bexley
  • Brent
  • Bromley
  • Camden
  • Chelsea
  • Clapham
  • Croydon
  • Dagenham
  • Ealing
  • Enfield
  • Fulham
  • Greenwich
  • Hackney
  • Hammersmith
  • Haringey
  • Harrow
  • Havering
  • Hillingdon
  • Hounslow
  • Islington
  • Kensington
  • Kingston upon Thames
  • Lambeth
  • Lewisham
  • Mayfair
  • Merton
  • Newham
  • Redbridge
  • Richmond upon Thames
  • Sidcup
  • Southwark
  • Sutton
  • Tower Hamlets
  • Twickenham
  • Waltham Forest
  • Wandsworth
  • Westminster

How Rainwater Harvesting Works

During rainfall, all water is channeled from the roof via the guttering system and downpipes direct into underground storage tanks. Upon entry, the water is passed through a sand filter to remove dirt, debris and sediment.

When needed, the water stored in the tanks can then be pumped back into the property for use.

It’s important to ensure that any water storage tank installed on your property is of an appropriate size, as failure to get this right can lead to the system becoming redundant or ineffective.

Tank size is usually calculated based on average rainfall for the area, size of the building, number of occupants and expected water usage.

Hosing Garden Washing Car

What is Harvested Rainwater Used For?

From a practical perspective, a rainwater harvesting system can reduce your demand on mains water by up to 50%.

Typically, harvested rainwater can be pumped back into your property for day-to-day use including:

  • flushing toilets
  • laundry
  • garden irrigation systems
  • car washing

With our extensive experience of rainwater attenuation, we can help to design a suitable system to suit your needs, demands and property.

If you live in London and are interested in installing, replacing or servicing a rainwater harvesting system, please call us on 08000 548 548 or email

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