Platin Silentio Rainwater Harvesting System

Delivery: 7-10 working days

£2,941.58£4,595.50 inc VAT

The Silentio system is designed to support toilets, washing machines, garden irrigation and outside cleaning purposes. Rainwater is collected from the roof of the property and is fed into the underground tank via the downpipes. On entry to the tank, the water passes over a filter, to prevent any debris going into the tank. With this system, there is a pump/control unit within the property. Water is drawn from the underground tank and pumped to the required location on demand. This unit primarily works on rainwater, and changes over to mains water when the rainwater in the underground tank reaches a low level. There is a mains water cistern located under the wall mounted pump. Mains water is taken from the cistern until the rainwater in the underground tank is replenished. As mains water is not being used to top up the underground tank, this means we maximise the amount of rainwater which can be collected. This operation is controlled via a digital level indicator located in the underground tank.  PLATIN telescopic dome shaft Mini green, with PE-lid, for pedestrian loading, option with cast iron lid for vehicle loading.

SKU: N/A Category:


Silentio Rainwater Harvesting system package, comprising of:

  • Platin underground tank 1500-7500 litres, without dome
  • Platin tank dome Maxi black, with sealing set DN 100
  • Platin telescopic dome shaft Mini green, with PE-lid, for pedestrian loading
  • Platin Filter package 3 House, Optimax-Pro filter internal/inflow stilling system/overflow siphon/Spannfix – DN 100
  • Pump package Silentio
  • 25m roll of rainwater harvesting b/g pipe, (32 mm, with brass fittings)

Additional information

Weight N/A
Dimensions N/A
Lid type

Pedestrian, Vehicle

Tank size (litres)

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Scope of Supply

  1. Underground tank (choice of tanks available, sizes vary according to property type)
  2. Telescopic lid (choice of telescopic lid available, depending on tank location)
  3. Filter (Minimax filter supplied in accordance with the type of tank)
  4. Floating water intake
  5. Silentio unit
  6. Float sensor (connected from Silentio unit to the underground tank)
  7. Reversible flow filter

Supplied by Others

  1. 100mm diameter duct pipe to contain; float sensor cable, power cable for the pump, also bringing mains water to underground tank as and when required
  2. 100mm diameter drainage pipe connected from downpipes to the inlet at the top of the tank (all downpipes brought into one pipe for connection to the filter)
  3. 100mm diameter pipe for overflow from the tank to mains drainage network or soakaway

System Benefits

  • Simple & quick to install
  • The Silentio is a wall-mounted pump that supplies harvested rainwater on-demand to WCs, washing machines & any external taps
  • The black cistern at the top of the Silentio is filled with mains water. The water is drawn from this cistern when the rainwater in the Platin tank is low. This gives the system the main water backup.
  • Innovative float sensor detection on the Silentio unit ensures that the household is constantly supplying water to the property but only the amount necessary.
  • Maintenance and servicing of the Silentio is straightforward as the pump is located above ground where it can be easily accessed.
  • A reversible flow filter is included in the Silentio package, this filter gives the system another level of filtrati0n.
  • The water level reader inside the underground tank relays an accurate reading of the amount of rainwater left in the tank.
  • Silentio package comes with a jet wash feature for the filter inside the tank which periodically removes any debris on the filter.

Product Dimensions, Levels & Weights

Platin Tank Dimensions & Weights (1500L – 7500L)

Rain Water Flat Tank 1500L Platin | Download
Rain Water Flat Tank 3000L Platin | Download
Rain Water Flat Tank 5000L Platin | Download
Rain Water Flat Tank 7500L Platin | Download

Platin Tank Levels & Invert Levels

Platin Tank Levels | Download

Platin RWH Tank Inert Levels | Download

Mini & Maxi Lid Dimensions

PE Mini Lid (Pedestrian Loading 371010) | Download

PE Maxi Lid (Pedestrian Loading 371011) | Download

Cast Iron Maxi Lid (Vehicle Loading) | Download

Extension piece options

Extension Sleeve (371003) | Download

Extension Sleeve (371015) 1000mm | Download


GRAF Platin RWH Brochure (UK Edition) | Download
GRAF Platin XL XXL | Download
GRAF Carat S RWH Brochure | Download
GRAF Carat XXL | Download
Aqua Centre Silentio Mains Water Backup Supply | Download

Data Sheets

Carat House Direct Package | Download
Carat House In-Direct Package | Download
Carat-S Eco Plus Package | Download
Carat-S Garden Comfort Package | Download
Carat-S Silentio Package | Download
Platin Eco Plus Package | Download
Platin Garden Comfort Package | Download
Platin House Direct Package | Download
Platin House In-Direct Package | Download
Platin Silentio Package | Download


Platin Garden Comfort Schematic Layout | Download
Platin Indirect Schematic Layout | Download
Platin Silentio Schematic Layout | Download
Platin Direct Schematic Layout | Download
Platin Eco-Plus Schematic Layout | Download

Carat Indirect Schematic Layout | Download
Carat Silentio Schematic Layout | Download
Carat Direct Schematic Layout | Download
Carat Eco-Plus Schematic Layout | Download
Carat Garden Schematic Layout | Download

Carat XL XXL Indirect Schematic Layout | Download
Carat XL XXL Silentio Schematic Layout | Download
Carat XL XXL Direct Schematic Layout | Download
Carat XL XXL Eco-Plus Schematic Layout | Download
Carat XL XXL Garden Comfort Schematic Layout | Download

This informative guide covers the following:

  • Loading information
  • Tank coverage heights
  • Excavation dimensions
  • Technical & general data
  • Installation & Assembly

Read the Guide | Download

A rainwater harvesting system will cut your home's demand for drinking water by up to 50% and therefore also protect the environment. But how much time do you have to factor in for operating and maintaining such a system? GRAF rainwater harvesting systems are designed so that only very few of the components need checking. This film shows which components need maintaining and how often. The intelligent components deliver perfectly clear rainwater with minimum maintenance effort, enabling you to save drinking water and time.

Extension Pieces

(Compatible with Platin and Carat systems)

Extension Sleeve (371003) | Download

1000mm Extension Sleeve (371005) | Download

infiltration Tunnels

(Applications: Inspection & maintenance across soakaways & drainage fields)

Infiltration Tunnel | Download

One2Clean Discharging to Tunnels (Excavation Layout)| Download

Rainbloc Crates

(Applications: Surface water soakaway)

Rainbloc Specification (2020 version) | Download

New Rainbloc Instructions | Download

Distribution Shafts

(Applications: Inspection and maintenance access to soakaways and drainage fields)

Distribution Shafts Flyer | Download

Portable Water Tanks

GRAF WWT UK Brochure | Download

Wastewater Treatment Systems

GRAF One2Clean Benefit Flyer | Download

Percolation Test Guides

(Applications: Soakaways and drainage fields)

Catalogue: Portable Water Solutions | Download

Graf UK has a national service provider network of contractors who can offer various services for our rainwater harvesting & wastewater treatment systems.

See this link for UK map showing companies who can offer installation for your Graf rainwater harvesting system, just enter your postcode to highlight the companies in your area.

Setting up the pump & filter packages for the Garden Comfort systems is relatively straightforward if you follow the installation guide.

If you require assistance you can contact ‘The Rainwater Guy’, who is an accredited service provider for Graf UK for commissioning, installation of controls & maintenance of our rainwater systems.

Please note the following regarding Graf UK deliveries -

We’re still delivering to our customers safely via our own delivery vehicles & drivers in the main, using external hauliers when required.

This gives us much greater control & flexibility over our deliveries.
All orders are typically delivered within 5-7 working days from receipt of order, however during this time due to UK-wide disruption, some deliveries may take a little longer and we would still aim to deliver within 10 days.

• Delivery lead time is 5-7 working days on all orders, unless otherwise advised.
• Price includes delivery to mainland UK.
• Please check for deliveries into Cornwall, Mid & Northern Scotland & Isles as additional delivery charges may be applicable.
• We cannot currently provide a tracking number for all orders but can accept customer enquiries by phone.
• Off-loading by the customer unless agreed otherwise.
• Tanks are generally strapped to a pallet for fork lift off-load, slings can also be used.
• Please advise if there is restricted access to site or special delivery instructions.