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Rainwater Harvesting Systems

Rainwater harvesting is the collection, storage and distribution of recycled rainwater, for use in various residential or commercial environments. Rainwater Harvesting Systems come in different forms. On Rainwater Solutions we sell Rainwater Harvesting Systems for small, medium and large gardens and homes, and Rainwater Harvesting Systems for large commercial buildings and land.

As an increasingly valuable and sustainable source, rainwater collected from roofs provides high quality water for relevant applications.

An average of 85,000 litres of rain falls on building roofs in the UK every year and the use of rainwater harvesting systems provides many benefits:

  • Significantly reduce mains water usage of a typical home by 70%
  • Offer large savings on household utility bills
  • For inside your home: laundry and toilet flushing
  • For outside your home: car washing, garden watering, ponds, paddling pools, swimming pools and pressure cleaning
  • With water metering and warmer climates making every-day watering more difficult and costly, rainwater harvesting offer the perfect solution.


Ready to get started?

Read our blog,  4 Simple Steps to Rainwater Recycling.

Rainwater Harvesting Systems

Rainwater harvesting systems are all you need to save, store and use rain water.

Good quality rain water is needed for a wide range of uses and starts with ensuring good quality rainwater goes into your storage tank.  We begin with the Gutter Mate Rainwater Diverter & Filter fitted into the downpipe.

This is connected into the tanks either by the diverter outlet on the Gutter Mate or via the main outlet.  If rainwater flow rates exceed the capacity of the Gutter Mate Filter, there are also available "in-tank" filters for underground tanks and external filters for free-standing above-ground tanks. Rainwater Solutions also provides a range of accessories, including hoses, mesh inserts, reducers, adapters and blanking caps.

Rainwater systems and rainwater collecting can be broken down into 3 categories:

1) Basic Rainwater Systems

Water Butts and stands are available with capacity normally up to 400 litres in the form of round water butts. For larger capacity storage you can shop for a rainwater tank. Water pumps can be used either submersible or free standing.  The key fact to remember with this type of system is that most pumps would very quickly pump out the average capacity water butt.  If you are connecting a number of butts together, the joining hose should have an equivalent flow rate to the pump or the pump could run dry before the water has run in from the other water butt.

Also available from our online shop are decorative water barrels and eco-friendly EcoSeat butts.

2) Above-Ground Rainwater Systems

The main advantages of above-ground rainwater systems, such as potable, static and squat are cost, ease of installation and maintenance.

Capacities range from 800L up to industrial sized systems of 100,000L. The smaller tanks are normally produced in plastic.  From 30,000L, the tanks are normally steel section.

Rectangular above-ground tanks are available, with capacities up to 4000 to /5000L.  The advantage of this tank is that it utilises the space available more efficiently than a round tank but costs more than a round tank.

Plastic tanks are ideal for all weather conditions and are able to withstand the freezing conditions of winter without any adverse effect, with temperatures down to -20C not affecting the plastic.

The worst condition for a plastic tank can be high temperatures, resulting in the plastic softening and the tank bulging.  Plastic tanks should always be produced with UV stabilised material. 

Colour is also important with above-ground systems, as light should not be allowed to enter the tanks as this promotes bacterial activity within the water.

3) Underground Rainwater Collection and Storage Systems

If the above-ground space is limited or needs to be used for other activities, underground rainwater storage is the answer.  Tanks vary in size depending on the space available and the demand for rain water.

The larger the tank the more consideration is needed regarding suitable ground conditions.  For example, a large diameter tank may require excavation to go below the water table which would bring up the possible issue of dewatering the excavation, with all the associate extra costs, before installing the tank.

The alternative is to install a shallow-dig rainwater harvesting tank and in most cases, for the same capacity, the excavation depth would be less than half that of the conventional round tank.

The disadvantage of the underground tank is you invariably have to use a pump to distribute the rainwater from the tank.

Cleaning the tanks can also be complicated, especially if sludge or debris is present. When emptying an underground tank, care should be taken in case methane gas is given off from the sludge as this could cause asphyxiation.

To prevent bad smells and the build-up of algae, we also provide the Plan-T Water Treatment Solution, ideal for water buts, tanks and barrels.

Rainwater Uses

Rainwater Harvesting in any of the forms above should help significantly reduce your use of mains water, whether it is watering the garden, washing the car, topping up your pond, flushing your toilets or pressure washing yards, patios and decking.

Rainwater can be used for flushing the toilets and in washing machines, this represents between 40 to 50% of domestic water usage.  This reduces your water bill by the same amount.

Additional controls (such as our Mains Backup Box and/or Loft Gravity Feed System) can include mains water top-up for periods of drought or high water usage.  Toilet flushing controls can also be included, either with direct pumping to the toilet cistern or to a header tank which will serve all the toilets in the house.  Irrigation systems can also be fed off the rain water harvesting system.

Rain Water Solutions range of rainwater collection systems

Rain Water Solutions' range of rainwater collection and recycling systems has been designed for easy installation, maintenance-free usage and maximum rainwater collection:

Rainwater Collection Systems

Storage Systems

Distribution Systems

Our rainwater harvesting packages (solutions including the above equipment) will help you create an efficient rain collection system for your property. Please contact us with any questions you may have.

©Copyright 2021 - Rainwater Solutions is a trading name of GM8 Group Ltd. A company registered in England & Wales (company number 04414980)