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2000 Gallon Low-Profile Underground Water Tank for Shallow Burial and High Groundwater Conditions
The Graf Platin 2000 Gallon Underground Cistern is the top-tier choice for large-capacity rainwater harvesting in locations with high groundwater levels or limited digging depth. Its ultra-strong, low-profile design allows for shallow burial while offering full stability and unmatched durability, even when empty. This system is designed for quick, cost-effective installation and includes a 14" telescopic riser, a 26" manway opening, and a secure, childproof locking lid.
With add-on options for vehicle loading and internal filtration, this tank is ideal for irrigation, backup water supply, and sustainable building projects.
Warranty: 15-Year Manufacturer Guarantee when installed according to specifications. The Tank Guaranteed Not to Collapse When Empty* * When installed in compliance with manufacturer's installation instructions.
Features and Benefits of the Graf Platin 2000 Gallon Tank
✓ Massive 2000-Gallon Capacity – Ideal for homes, commercial properties, or farms looking to store large amounts of rainwater without deep excavation.
✓ Low-Profile Design Saves Time and Money – Requires minimal installation depth, reducing excavation time and cost — perfect for rocky terrain or high water tables.
✓ No-Collapse Engineering – Tank is guaranteed not to collapse when empty if installed per the manufacturer’s guidelines.
✓ Groundwater-Stable to the Tank’s Shoulder – Built to remain stable even in saturated soil conditions.
✓ Ready for Vehicle Loads (Optional) – Upgrade with a cast iron lid for installations under driveways or parking lots (up to 2.2 tons per axle).
✓ Includes Telescopic Riser and Locking Lid – 14" green riser tilts up to 5° to match grade. 26" manway offers easy inspection and access.
✓ Internal Filter Ready – Compatible with the Minimax Pro or Basket Filter systems for clean, efficient rainwater collection.
✓ Made for Long-Term Use – Manufactured from ultra-durable materials, easy to transport, and backed by a 15-year warranty.
Specifications for the Graf Platin 2000 Gallon Underground Tank
Capacity
2000 Gallons (Fully Usable)
Weight
Approx. 795 lb
Length
142 inches
Width
89 inches
Height to Tank Shoulder
49 inches
Height of Dome Collar
12.5 inches
Manway Opening
26 inches
Dome Diameter
31.5 inches
Riser Included
14-inch Telescopic Riser
Lid Type
Childproof PE Locking Lid
Groundwater Stability
Up to the tank’s shoulder
Vehicle Load Rated
Optional, up to 2.2 tons axle load
Installation Type
Shallow Burial
Warranty
15 Years (Manufacturer)
Ease of installation
Minimum installation depth greatly reduces installation time and cost, while modular components and integrated filter technology make the system easy to assemble.
Ultra-high strength materials and design enable a wide variety of installation options like high groundwater tables, underneath driveways and areas where rock and other obstructions prevent deeper burial.
Telescopic riser tilts up to 5°, making it easy to match existing grade.
Optional Accessories
Internal Minimax Pro Filter Option:
Specially designed for rainwater harvesting, the Graf Minimax Pro internal self-cleaning filter handles debris from roof areas up to 3,750 sq. ft.
Greatly simplified installation
Only one lid in the yard
Provides over 95% water yield
Self-cleaning
Very low maintenance
Optional Opticlean sprayhead available
Internal Basket Filter Option
The internal basket filter provides 100% water yield for installations where every drop counts. Filter handles debris from roof areas up to 3,750 sq. ft.
Greatly simplified installation
100% water yield
Convenient lift-out handle
Easy access for cleaning under tank lid
Vehicle Loading Option
Includes heavy duty telescopic dome shaft and cast iron lid for vehicle loading up to a maximum axle loading of 2.2 tons.
Upgrade price
Tank Dimensions
Tank
400 Gallons
800 Gallons
1350 Gallons
2000 Gallons
Part No.
390000
390001
390002
390005
Weight (approx)
175 lb.
375 lb.
530 lb.
795 lb.
Length (l)
83"
96"
114"
142"
Width (w)
49"
83"
91"
89"
Height of tank shoulder (h)
28"
29"
37"
49"
Height of dome collar (hc)
12.5"
12.5"
12.5"
12.5"
Ø Manway opening (m)
26"
26"
26"
26"
Ø Tank dome (d)
31.5"
31.5"
31.5"
31.5"
Customers are saying
5.00 ★ (5)
Verified
Is this easy to use? I haven’t had a system like this before.
Yes, it’s designed to be simple and beginner-friendly. If you’re just using a tank or a basic bundle, it works passively, rainwater flows from your roof into the tank through a downspout diverter. There’s no need for electricity or complicated setup. If you need to add a tank to an already established rainwater system, it’s just as easy, most tanks can be connected in series or used as additional storage with a few basic fittings. We can help you choose the right components to make the expansion seamless.
How do I know what tank size I need for my home or garden?
A simple way to estimate the right tank size is by calculating how much rainwater your roof can collect. Multiply your roof’s surface area (in square feet) by your average annual rainfall (in inches), then multiply by 0.62, this gives you the total gallons you could collect in a year. For example, a 1,000 sq ft roof with 30 inches of rainfall can collect around 18,600 gallons annually. From there, we can help you choose the right tank size based on your water use and how much storage you want on hand, whether you're using it for irrigation, home use like toilets or laundry, or even potable water with proper filtration.
Can I bury this tank underground?
Yes and no, not all tanks are designed to be buried. Only tanks that are specifically rated for underground installation should be placed below ground. Always check the product specifications or reach out to us before burying any tank to ensure it’s safe and properly supported.
Is this tank safe for long-term water storage?
Absolutely. Our tanks are made from high-quality, UV-stabilized, food-grade polyethylene or reinforced materials designed for long-term rainwater storage. They resist algae growth and won’t leach chemicals into your water.
Can I collect rainwater from just one downspout?
Yes. Many basic systems start with a single downspout diverter, especially for smaller tanks. This setup is easy to install and still collects a significant amount of water, especially in areas with frequent rainfall or large roof sections.
What’s the difference between above-ground and underground tanks?
Above-ground tanks are easier to install, inspect, and move. Underground tanks save space and are often used when visual impact or limited yard space is a concern. We offer both, and we’re happy to help you decide what fits your space and needs best.
Will the tank overflow if it fills up?
No worries, each tank includes an overflow port that directs excess water safely away from the tank when it’s full. You can connect this to a drain, second tank, or garden area to make use of the overflow.
Can I connect this tank to a pump later on?
Yes. All of our tanks are compatible with add-on pumps, filters, and automation systems. You can start simple and upgrade later with no problem, just let us know your goals and we’ll help future-proof your setup.
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