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Sabre Rigs Ltd.Water Harvesting Kit

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Rain Water Harvesting Kit (RWH150)

The Rain Water Harvesting Kit is intended to demonstrate the various stages in the rainwater harvesting process on a small scale. Rainwater Harvesting is now a requirement under level 3 of the Plumbing syllabus. For training purposes the roof guttering and downpipe is mounted onto a vertical backboard. A small submersible pump enables water to be continuously circulated from the storage tank to the roof guttering.

The Rainwater Harvesting Kit (Basic) comprises the following features:

Image: Water Harvesting kit

1. Combi filter unit

This is installed above a 250 litre Rainwater Storage Tank. Rainwater from the gutter is channelled via a downpipe into the inlet at the top of the filter.

The filter system removes small pieces of debris e.g. leaves, moss, twigs etc. that enter with the surface water. These are discharged with a small amount of water through the dirty water outlet where it can be collected in a container and reintroduced at the gutter. (In practice this would be piped away to soak away/sewer). Filtered water passes through a sealed outlet at the bottom of the filter into the storage tank below. Calmed Inlet

Filtered rainwater enters the storage tank via a calmed inlet. The purpose of this is to prevent disturbance of the settled sedimentation layer and to supply the lower part of the water with oxygen. Therefore the water remains fresh.

Image: RWH Combi Filter Unit

2. Overflow Siphon

Practical application - Any floating materials are skimmed off by the chamfered slots when the tank overflows. Image: RWH Overflow Siphon

3. Submersible Pump with hose and connections

This enables continuous operation whilst teaching to demonstrate the entire process.

Filtered water from the storage tank is returned to the roof guttering. A float switch regulates the water level within the storage tank

Overall dimensions - L x H x W (mm): 1400 x 1100 x 550

Image: RWH Submersible Pump with hose and connections

Rainwater Harvesting Rig RHK100

The training rig includes a gutter collection/downpipe system - preassembled and mounted onto a board adjacent to the rainwater harvesting kit

Please note: We also supply larger rainwater harvesting systems - available upon request.


Sabre Rigs Ltd.Rainwater Harvesting Automated ‘Direct Feed’ Kit


Automated 'Direct Feed' Rainwater Harvesting Kit

Level 3 Plumbing courses (City & Guilds 6189) that include a module on 'Rainwater Harvesting' are now required to include an understanding of automated control i.e. how rainwater can be supplied to demand, dry-run protection of pumps and how a mains backup system can be used to control supply of rainwater from the storage tank with top up from the mains. This is an element that is described as 'back-up supply' in the assessment criteria and students need to test the correct functioning of such a control unit.
Image: Rainwater Harvesting overview

The automated ‘Direct Feed’ Rainwater Harvesting Kit is designed to demonstrate these aspects within the system.

It demonstrates how to harvest rainwater from a roof and store it in a tank for non-potable domestic use, thereby reducing mains water demand. The pump in the storage tank sends rainwater directly to the point of use e.g. toilet flushing, garden watering etc. If the stored rainwater runs out, mains water is automatically brought to the system to meet the demand.

The photo above shows the set-up we have installed in the warehouse. Water enters the rainwater storage tank via downpipe and calmed inlet. To simulate this process mains water could be gravity fed from a header tank (not included). Water from the storage tank can be pumped up to feed, for example, one or two WC’s.

The control system provided with the automated rainwater harvesting kit enables:

  • Supply to automatically switch between harvested and mains supply.
  • Pump to be switched on and off with demand
The automated system utilises a float switch and solenoid valve; the float switch detects when the rainwater storage tank is empty and opens the electrically-actuated solenoid valve so that mains water flows into the bottom of the tank. When the float switch floats off the bottom of the tank it turns the solenoid valve off. The bulk of the storage tank remains empty ready to admit the water from the next ‘rain shower’.

The Automated Rainwater Harvesting Kit comprises four basic elements:

Image: Rainwater Harvesting system

1. Mains Back Up Supply

The photo below shows the 'Rain Backup in a Box' mounted on the wall above the tank. When rainwater level drops, mains water running from the solenoid valve into the tundish can be seen through the transparent cover and heard through the aperture at the side. The ‘Rain Backup in a Box’ is a compact unit, with one electric plug to a wall socket, mains water input and a pipe to the storage tank.

Image: Mains Supply diagram

Image: Mains Supply

2. Rainwater Storage Tank

The training rig utilises the bottom section of a Graf Hercules rainwater tank (Max. capacity 800L), enabling all round accessibility to observe the various aspects of the rainwater harvesting process, including the filter unit that would normally be enclosed within the upper section.

Fabricated from fibre-glass reinforced PP

Dimensions: Min Ø: 1.09 m Max Ø: 1.315 m Height: 0.780 m

A 250L Stormwater Overflow Tank is included with this kit to sit alongside the Rainwater Harvesting Storage Tank (connecting pipework included). A Hydroforce clean water pump is sited on top of the tank and controlled via a float switch


3. Rainwater Harvesting Pump

An important part of this kit is the HydroForce Series 3 clean water pump. (* Two pumps are supplied with the kit). It is an electronically-controlled, pressure-sensitive, centrifugal roto-dynamic pump with no reciprocating parts.

Within the main Rainwater Storage Tank it functions as a submersible pump (See above photo), however for below ground installations it can be also be externally connected and installed above the tank. In the kit the second pump sits on top of the storm water overflow tank.

Main features include:

  • Pressure-sensitive (demand) pump which turns itself off until there is a demand for water.
  • Dry-run Protection: when no water is detected for 8 seconds, the pump is turned off by the printed circuit board (PCB) in order to protect the motor and pump from burning out. Automatic reset after a period of 30 minutes. If water is still not detected, subsequent reset periods are 1.5 hours, 3 hours, 7 hours, 12 hours, 24 hours then back to the beginning of the cycle. Additionally, a thermal switch, not connected to the PCB, turns the pump off when motor overheats. It resets when cool which make take several hours.
    This dry-run cut out feature can also be observed with the storm water pump which will turn off when the contents have been pumped back into the main harvesting tank.
  • Max head (nominal) 35 metres, pump pressure (nominal) at outlet 3.5 bar (household pressure is around 2.5-4.0 bar), max suction 3 metres. Delivers over 2500 litres per hour using a 1" connector. Uses 800 watts at 220-240v AC (10 metre cable included)
  • Factory fitted filter and connectors
Image: Water Pump

4. Rainwater harvesting filter

The automated system kit incorporates an Optimax-Pro rainwater harvesting filter which is recommended for use in underground tanks. The filter combines an extremely low height offset of just 165mm with maximum yield.

It is very low in maintenance due to its self-cleaning construction. There are three layers to the filter; 1) on the top is the stainless steel fine filter with a mesh of only 0.35mm (350 microns or 0.01 inches) with a very smooth upper surface which aids the self-cleaning process, 2) a synthetic carrying surface with a diamond pattern and 3) the collector surface for micro particles.

The filter can be visually checked through the transparent cover when closed, or the cover and filter can be lifted as required for inspection or further cleaning of the collector surface.

Image: Rainwater filter
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Sabre Rigs Ltd.
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Registered Office: Little Barn, 37 Beeches Road,
East Sussex