RainCell™ commercial rainwater harvesting systems

Industrial and commercial rainwater harvesting

The Marsh Raincell is the simplest, most reliable and cost effective rainwater harvesting system on the market.

With storage capacities to accommodate most roof sizes the Raincell system effectively stores and distributes clean recycled rainwater to properties allowing end-users to save on their metered water costs whilst helping architects, civil engineers and contractors conform to current environmental and legislative standards.

Rainwater harvesting system options

RainCell X50
For light industrial/commercial applications where space is limited or mains water top-up has been specified.

RainCell 75H
Ideal for plant rooms or where a break tank system has been specified.

Is harvesting rainwater worth it?

Yes. As well as the practical and ecological benefits given here, it is wise to bear in mind that commercial rainwater harvesting is a complex area with no quick and easy off-the-shelf solutions. Therefore every Marsh RainCell system is tailor-made to suit individual site requirements and, in association with other water efficiency measures, maximises cost-effectiveness to ensure that system payback can be achieved as quickly as possible.

  • Save on rising water costs
    It is estimated that up to 85% of mains water delivered to commercial applications is used for toilet flushing, urinal flushing and other non-potable uses. All of this can be provided by recycled rainwater resulting in reduced bills for water supply and associated waste water disposal.
  • Reduce your carbon footprint
    Mains water is pumped long distances and heavily treated to make it potable. Up to 85% of mains water in commercial applications does not need to be potable, thus harvesting rainwater for reuse at source has a lower carbon footprint.
  • Compliance with legislation and environmental initiatives
    Specifiying a Marsh rainwater harvesting system enables conformity with current legislation and initiatives for water conservation in domestic and commercial buildings:
    • British Standard BS 8515:2009 Parts 1 & 2
      British Standard BS 8515:2009 gives guidance on the design, installation, testing and maintenance of rainwater harvesting systems for applications including laundry, WC flushing and garden irrigation.
    • The code for sustainable homes
      The Code for Sustainable Homes sets targets for reducing the consumption of potable mains water from the current average level of 150 litres per person per day, to 80 litres. Code credits are awarded on a graded scale, from 1 to 6 (6 being best of all).
    • BREEAM
      The Building Research Establishment Environmental Assessment Method (BREEAM) is recognised as the standard measure of sustainable building design. It covers environmental and sustainability issues and enables developers to prove the environmental credentials of their buildings to planners and clients.
    • Sustainable Drainage Systems (SuDS)
      Environmental policy to address the issues of both quantity and quality of water run-off from sites. Attenuation and harvesting form an integral part of schemes to counter the potential problems of increased volumes which can lead flash floods.
Industrial/Commercial rainwater harvesting systems

  1. Rainwater capture Rainwater runs off roof into downpipes and flows towards tank inlet
  2. Filter assembly Rainwater is filtered before entering tank to remove leaves, debris and contaminants
  3. Overflow Initial unfiltered water/debris flows to soakaway (via leaf filter), drain or surface water
  4. Calmed inlet Reduces water turbulence on entering tank chamber so any base silt remains undisturbed
  5. Floating suction point Draws clean water into pump
  6. Stainless steel pump Pumps recycled rainwater to management unit (In the RainCell X50 system, the water is pumped directly to utilities)
  7. Underground conduit Carries pipework and electrical cables to and from tank
  8. Rainwater management unit Controls the distribution of rainwater from tank to utilities

Is harvesting rainwater worth it?
Yes. As well as the practical and ecological benefits given here, it is wise to bear in mind that commercial rainwater harvesting is a complex area with no quick and easy off-the-shelf solutions. Therefore every Marsh RainCell system is tailor-made to suit individual site requirements and, in association with other water efficiency measures, maximises cost-effectiveness to ensure that system payback can be achieved as quickly as possible.

  • Save on rising water costs
    It is estimated that up to 85% of mains water delivered to commercial applications is used for toilet flushing, urinal flushing and other non-potable uses. All of this can be provided by recycled rainwater resulting in reduced bills for water supply and associated waste water disposal.
  • Reduce your carbon footprint
    Mains water is pumped long distances and heavily treated to make it potable. Up to 85% of mains water in commercial applications does not need to be potable, thus harvesting rainwater for reuse at source has a lower carbon footprint.
  • Compliance with legislation and environmental initiatives
    Specifiying a Marsh rainwater harvesting system enables conformity with current legislation and initiatives for water conservation in domestic and commercial buildings:

    • British Standard BS 8515:2009 Parts 1 & 2
      British Standard BS 8515:2009 gives guidance on the design, installation, testing and maintenance of rainwater harvesting systems for applications including laundry, WC flushing and garden irrigation.
    • The code for sustainable homes
      The Code for Sustainable Homes sets targets for reducing the consumption of potable mains water from the current average level of 150 litres per person per day, to 80 litres. Code credits are awarded on a graded scale, from 1 to 6 (6 being best of all).
    • BREEAM
      The Building Research Establishment Environmental Assessment Method (BREEAM) is recognised as the standard measure of sustainable building design. It covers environmental and sustainability issues and enables developers to prove the environmental credentials of their buildings to planners and clients.
    • Sustainable Drainage Systems (SuDS)
      Environmental policy to address the issues of both quantity and quality of water run-off from sites. Attenuation and harvesting form an integral part of schemes to counter the potential problems of increased volumes which can lead flash floods.

System Filter Storage tank Stainless steel pump Rainwater management unit
RAINCELL X50 SYSTEM Stainless steel filter specifically developed for rainwater harvesting (High capacity / high efficiency). Heavy duty shell as standard ensures tank integrity.
Integral lifting eyes for improved on-site handling.
Unique ‘keying-in’ lip to assist anchoring into granular or concrete surround.
Twin stainless steel pump arrangement transports rainwater direct to utilities. X50 system consists of a compact control console inside the building and two stainless steel submersible pumps in the rainwater tank.

On the console are the pump controls and a solenoid valve with funnel for topping up the tank with mains water.

A level sensor constantly monitors the level of rainwater in the tank so that topping up with mains water only occurs when necessary.

RAINCELL 75H SYSTEM Stainless steel filter specifically developed for rainwater harvesting (High capacity / high efficiency). Heavy duty shell as standard ensures tank integrity.
Integral lifting eyes for improved on-site handling.
Unique ‘keying-in’ lip to assist anchoring into granular or concrete surround.
Single stainless steel pump transports rainwater to the management unit. The 75H is a complete rainwater system with integral storage tank, dual pump pressure raising unit and electronic controller.

The controller continuously monitors the levels in both the storage tank and integral tank:
• the feeder pump in the storage tank conveys the rainwater to the integral tank
• The integrated dual pump unit transports rainwater to utilities

If rainwater is scarce (or the system is switched to manual) mains water is fed to the integral tank automatically to match demand.

Marsh RainCell brochure
Marsh RainCell commercial brochure