Product Information
Constant pressure problems. Compatibility issues. Systems that fail when you need them most. If you're managing a large property or commercial site, you can't afford those risks.
The RainFlo 5100 PRO solves all of that. It's a complete, in-ground rainwater harvesting system built for high-demand applications where performance, reliability, and control matter.
You get consistent water pressure thanks to the 2 horsepower variable-speed pump, which automatically adjusts to your system’s needs. No more pump cycling or pressure drops. The smart controller gives you real-time system monitoring and automatically switches to backup water when your rainwater supply runs low, so you’re never left without water.
Every component has been carefully selected and perfectly matched for optimal performance. There’s no guesswork, no part sourcing, and no risk of mismatched fittings or system failure. You receive everything pre-engineered to work together from day one.
The Duralen tank construction offers long-lasting durability. The advanced control system reduces energy waste, extends equipment life, and gives you peace of mind with fully automated operation.
If you're looking for a complete solution that handles pressure control, filtration, automation, and backup management all in one system, the RainFlo 5100 PRO is built to deliver every day, in any condition.
Features
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Graf 1700 Gallon Carat Tank – Underground cistern with pedestrian-rated manway, 14" telescopic riser, and childproof PE lid. Can be left empty without the risk of collapse.
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(2) Graf 1700 Gallon Carat Extension Tanks – Sealed tanks that expand your system capacity to 5,100 gallons. More tanks can be added for additional storage.
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Graf Optimax Pro Internal Filter Package – Internal self-cleaning cascade filter with calming inlet, overflow siphon, and all required fittings. Supports roof areas up to 3,750 sq. ft.
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Graf Opticlean® Spray Head – 16 high-intensity water jets clean the Optimax filter cartridge, reducing maintenance and maximizing filter performance.
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RainFlo FI-2500 Flow Inducer Pump Station – 2 HP variable frequency drive pump provides consistent pressure output by adjusting motor speed based on real-time sensor feedback — more efficient and responsive than traditional on/off systems.
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Rainwater System Controller – Manages pump operation, tank level monitoring, backup valve switching, and system diagnostics.
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Motorized 1.5" 3-Way Backup Valve – Automatically switches between rainwater and municipal (or backup) supply based on tank level, ensuring uninterrupted service.
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Reduced Pressure Zone (RPZ) Backflow Prevention Assembly – Protects potable lines by preventing potential backflow from the rainwater system when municipal backup is in use.
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Bulkhead Fittings –
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(2) 2" Vent Caps – Allow air movement into and out of extension tanks during fill cycles.
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Multi-Tite Sealing Gaskets –
Vehicle Loading Option Available
This system comes standard with a pedestrian-rated access lid for lawn, landscape, or walkable areas.
If installed in a driveway or area with vehicle traffic, upgrade to a vehicle-rated access kit that includes:
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Heavy-duty telescopic dome shaft – Adjustable to match ground level
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Cast iron lid – Rated for up to 2.2 tons per axle (cars, pickups, light trucks)
This ensures long-term protection of the tank system in high-traffic areas.
Returns Policy
If you are not satisfied with your purchase, please call us at (314) 200-1341 and request a Return Material Authorization prior to returning any merchandise. Requests for returns for standard non-special-order items may be made within 30 days of the item's ship date.
In order to provide our customers the highest quality products at the lowest possible prices, we only accept returned merchandise in "factory new” condition. We must be able to resell the product as new in the condition it is returned to us.
'Factory New' Includes:
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The original retail packaging in like-new condition. No missing, torn, taped, scratched, crushed, soaked or disfigured packaging will be accepted. Packaging includes all padding, spacers, bags and any other component used for packaging the product or its accessories.
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All parts, fittings, adapters, instructions, manuals, cords and any other components that were included with each product eligible for return.
Always package the returned items inside of another durable box to prevent damage to the original product packaging. If items are damaged during shipping in transit back to us due to improper packaging, you will only be refunded for the items not damaged, less any additional shipping costs to return the damaged products to you.
Refunds for approved returns will be credited in the same form of payment used for the purchase unless other arrangements have been made. Credit card refunds can take 24-48 hours to appear in your bank account.
Special order and/or custom fabricated products may not be cancelled or returned under any circumstances.
If you have any questions regarding our shipping and returns policy, e-mail us at support@hefountaindirect.com or call us at (314) 200-1341 and choose the option for our Shipping Department.
Downloads
Download Complete System Submittal
Download System Drawing
Flow Inducer and Backup Supply Configurations
Download DWG (CAD) File
Download Specification (.rtf)
