The GRAF Platin In-Direct Rainwater Harvesting System Stores and pumps rainwater to a header tank inside the home for gravity-fed reuse. Ideal where pressure or supply consistency is a concern.
Available in sizes 1500L - 7500L
The indirect supply system is designed to support WCs, washing machines, irrigation, and outside cleaning purposes. Rainwater is collected from the roof of the property and fed into the underground tank via the downpipes. On entry to the tank, the water passes through a filter to prevent any debris from going into the tank. With this system, there is a pressure-sensitive pump located in the underground tank.
When a valve or tap is opened, water will be pumped under pressure until the valve is closed, allowing the system to repressurise turning the power off to the pump. From the header tank, the water is gravity-fed to the WCs, etc. It is all automatic; whenever there is a demand for water, i.e., when the toilet is flushed, the harvested rainwater will be gravity fed to the toilet from the header tank, and then the pump inside the underground tank tops up the header tank. In periods without rainfall, the water level inside the underground tank will drop.
When the rainwater level is too low, the pump will stop pumping harvested rainwater to the header tank. This, in turn, will result in the rainwater level in the header tank dropping. Inside the header tank, there is a floating ball valve that controls the top-up of mains water in periods with no rain. This means that the system maximises the use of all available rainwater. If the system is to be used for garden irrigation, an outside tap should be installed on the pipework directly off the pump. A T-junction can be used to achieve this. This will imply that direct pump pressure is now supplying the garden tap. (NB: when the tank is low on rainwater, there will be no mains water top-up to the outside tap.)
Feeds indoor appliances via header tank system
Includes high-efficiency pump and mains top-up
Offers quieter operation and better pressure control
Cost-Effective Installation: The system uses gravel backfill instead of traditional concrete, saving you around £60 per cubic metre in installation costs.
Sustainable Construction: With an underground tank made entirely from 100% recycled plastic, the system aligns with environmentally responsible practices.
Smart Water Management: It includes an automatic submersible pump equipped with automatic restart and dry-run protection, ensuring efficient operation with minimal maintenance.
Reliable Water Supply: A standout feature is the integrated mains water back-up. It automatically tops up the header tank with mains water whenever the rainwater levels in the underground tank are insufficient, ensuring you always have access to water.
Vehicle Loading Lid (optional): Ideal for properties with limited space, this feature allows for installation directly in driveways without sacrificing functional garden space or property aesthetics.
Platin complete package In-Direct -supply 1500-7500 Litres, comprising of:
Underground tank (choice of tanks available, sizes vary according to property type)
Telescopic lid (choice of telescopic lid available, depending on tank location)
Minimax filter supplied in accordance with the type of tank
Submersible pump with floating water intake
Float switch (connected from mains water backup unit to the underground tank)
Header tank package
The GRAF Platin In-Direct Rainwater Harvesting System Stores and pumps rainwater to a header tank inside the home for gravity-fed reuse. Ideal where pressure or supply consistency is a concern.
Available in sizes 1500L - 7500L
The indirect supply system is designed to support WCs, washing machines, irrigation, and outside cleaning purposes. Rainwater is collected from the roof of the property and fed into the underground tank via the downpipes. On entry to the tank, the water passes through a filter to prevent any debris from going into the tank. With this system, there is a pressure-sensitive pump located in the underground tank.
When a valve or tap is opened, water will be pumped under pressure until the valve is closed, allowing the system to repressurise turning the power off to the pump. From the header tank, the water is gravity-fed to the WCs, etc. It is all automatic; whenever there is a demand for water, i.e., when the toilet is flushed, the harvested rainwater will be gravity fed to the toilet from the header tank, and then the pump inside the underground tank tops up the header tank. In periods without rainfall, the water level inside the underground tank will drop.
When the rainwater level is too low, the pump will stop pumping harvested rainwater to the header tank. This, in turn, will result in the rainwater level in the header tank dropping. Inside the header tank, there is a floating ball valve that controls the top-up of mains water in periods with no rain. This means that the system maximises the use of all available rainwater. If the system is to be used for garden irrigation, an outside tap should be installed on the pipework directly off the pump. A T-junction can be used to achieve this. This will imply that direct pump pressure is now supplying the garden tap. (NB: when the tank is low on rainwater, there will be no mains water top-up to the outside tap.)
Feeds indoor appliances via header tank system
Includes high-efficiency pump and mains top-up
Offers quieter operation and better pressure control
Cost-Effective Installation: The system uses gravel backfill instead of traditional concrete, saving you around £60 per cubic metre in installation costs.
Sustainable Construction: With an underground tank made entirely from 100% recycled plastic, the system aligns with environmentally responsible practices.
Smart Water Management: It includes an automatic submersible pump equipped with automatic restart and dry-run protection, ensuring efficient operation with minimal maintenance.
Reliable Water Supply: A standout feature is the integrated mains water back-up. It automatically tops up the header tank with mains water whenever the rainwater levels in the underground tank are insufficient, ensuring you always have access to water.
Vehicle Loading Lid (optional): Ideal for properties with limited space, this feature allows for installation directly in driveways without sacrificing functional garden space or property aesthetics.
Platin complete package In-Direct -supply 1500-7500 Litres, comprising of:
Underground tank (choice of tanks available, sizes vary according to property type)
Telescopic lid (choice of telescopic lid available, depending on tank location)
Minimax filter supplied in accordance with the type of tank
Submersible pump with floating water intake
Float switch (connected from mains water backup unit to the underground tank)
Header tank package
Image 1 of 2
Image 2 of 2
