100 Litre Rainwater Harvesting Tank


In Stock


  • Supplied as standard with a 1.5” Outlet 177815 (other options available)
  • Lid: 140 mm
  • Dimensions (mm): 500 dia x 670 h
  • Colours: Black, Boat Blue or Dark Green colour
  • 100% rust proof
  • UK manufactured
  • 10 Year guarantee
  • Supplied direct from stock for fast delivery
    Does your project need to meet Fluid Category 5 regulations?
    Please note: Tank sizes quoted are subject to a +/- 3% variation

Outlet Options *

WRAS approved BSP Plastic Tank Connectors

Lid Options *

Tank Linking Kits *

Float Valves *

Ball Valves *

Customer Offloading *

It is the customers responsibility to offload, a HIAB is available for an additional fee

100 Litre Rainwater Harvesting Tank 

Enduramaxx’s 100 Litre Rainwater Harvesting Tank is 500mm dia x 680mm H and constructed from the MDPE polyethene which is UV stabilised.  This tank is a one-piece, seamless, rotationally moulded tank which guarantees strength, impacts resistance and durability and many years of use.  This rainwater tank is designed to provide rainwater/grey water storage for rainwater harvesting system allowing rainwater to be harvested, conserved and recycled at your convenience.  These tanks can be used in many applications where mains water is not required or not available.   

 Uses for the 100 Litre Rainwater Harvesting Tank:  

  • Landscape watering for parks and recreational purposes  
  • Horticultural and Market Garden applications  
  • Cost-effective watering systems for groundskeepers and sporting stadia  
  • Toilet flushing in an industrial, commercial, hospital or school environments  
  • Equine and agricultural establishments  
  • Irrigation and/or wash-down facilities  
  • Rainwater, being non-chlorinated, is better for plants and gardens  
  • Civil engineering applications where mains water is unavailable  
  • Agricultural tank and farm sprayer tank  
  • Crop sprayer tank  
  • Seawater storage tanks for aquariums and sea life centres  

Rainwater Harvesting FAQ’s  

What is rainwater harvesting?  

Rainwater harvesting is the collection of rainwater from the surface or surfaces upon which it falls. This water would otherwise have gone into the drainage system. Once collected and stored, the rainwater can be used for non-potable applications such as toilet flushing, garden watering and washing clothes using a washing machine.  

Why should I consider a rainwater harvesting system?  

Water resources are under pressure in England & Wales as demand for water is rises due to the increase in the population, changes in lifestyles and a changing climate.  

What savings can be achieved by using a rainwater harvesting system?  

Any rainwater harvesting system will reduce your dependence on the mains water supply. Potential savings should be assessed on an individual basis, factors which will influence this are the demand for non-potable water, the amount of rainwater that can be collected and whether the property is charged by volume of volume used. Savings will be higher in commercial/industrial buildings and schools as these types of buildings having much larger roof areas and a much greater demand for non-potable water.  

Are there grants for rainwater harvesting?  

There are grants for rainwater harvesting which are available in regions of the country.  

Equipment Mounting and Customisation  

The 100-litre rainwater tank is available with tank modifications including Liquid level sensor assemblies, fill pipes, BSP threaded inlets, outlets or PN16 flanges. Our range of rainwater filters can be viewed here.  Rainwater filters are important to make the water used in any rainwater harvesting system and are used to filter debris from the rainwater as it flows from the collection roof before it enters the storage tank.  Calmed inlets are used as part of the filter system as the water runs down to the bottom of the tank and fills the tank through the calmed inlet at the bottom of the tank. This oxygenates the water in the tanks and helps prevents it from stagnating.  When the tank is full the overflow siphon diverts the excess water to a drain or soakaway.   

Delivery of Your Rainwater Tank  

Our 100 litre rainwater harvesting tank are manufactured by Enduramaxx at our factory in Lincolnshire. Most of these water tanks are stocked for collection or quick delivery throughout the UK. We are available to deliver to site for installers to save double handling of these tanks. In cases where clients can’t offload the tank, we can offer Hiab deliveries which are priced upon request.  Please view our installation guide here

How big is a 100 Litre Rainwater Harvesting Tank?

Capacity  100 Litres 
Diameter  500mm 
Height  670mm 
Outlet  1.5″ standard male outlet with other options available 
Lid  140mm dia lid 

Additional information

Dimensions 50 × 50 × 67 cm

Rainwater Harvesting Calculator

Rainfall Calculator

Need help selecting which tank is right for you? Use our calculator below to make your selection easier!

Amount of Rain Harvested (litres):

Minimum Tank Size:

Assume the tank can fill 3 times per year (Depends on rainfall and usage patterns)

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