OASE Waterfall Pump 6600 – 6600 GPH High-Flow Submersible Pond & Waterfall Pump for Large Features
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Description
The Oase Waterfall Pump 6600 (SKU 45425) is a high-flow, energy-efficient waterfall and pond pump delivering 6,600 GPH at a maximum head of 26.5 feet on just 460 watts. The asynchronous motor is engineered specifically for continuous waterfall and stream applications, excelling in hard water conditions where other pumps scale and fail. An integrated grounding plate eliminates stray current in the pond water. The 2” MIPT outlet with 1.5”–2” step adapters connects directly to standard pond plumbing. The pump can be installed submersed or inline (below water level) — the only Waterfall Pump models with inline capability are the 6600 and 8000. Tool-less volute removal provides fast maintenance access without tools, and a replaceable corrosion-resistant rotor extends serviceable pump life. Self-cooling, debris-flushing rotor chambers protect the motor in demanding applications. Handles solids up to 1/6”. 3-Year warranty (2+1 with online registration). cULus listed. GFCI-protected outlet required. Not for use in pools or salt water.
Why Choose the Oase Waterfall Pump 6600?
- 460 watts for 6,600 GPH — energy-efficient asynchronous motor: The 6600 uses an asynchronous motor specifically engineered for waterfall and pond-free stream applications. The low-resistance, open-flow design delivers high volume at relatively low wattage, making it cost-effective for continuous 24/7 operation over the pond season.
- 26.5 ft maximum head height: With a max head of 26.5 feet, the 6600 supports waterfalls and streams with vertical rises up to that height. Actual flow at head varies with installation — refer to the pump performance chart for GPH at your specific lift height when sizing for your waterfall spillway.
- Inline or submersible installation: Unlike the smaller Oase Waterfall Pumps (1650–5150, submersible only), the 6600 and 8000 can be installed inline in a dry location below water level, opening up pump vault, skimmer bypass, and external plumbing configurations. For inline use, position the pump housing below the pond water surface level so gravity feeds the intake.
- Tool-less volute removal for fast maintenance: The pump volute (front chamber housing the impeller) twists off without tools, providing full access to the impeller and rotor assembly for cleaning or replacement in minutes. No wrenches, no specialty tools, no extended downtime.
- Replaceable corrosion-resistant rotor: The asynchronous 6600 and 8000 feature user-replaceable rotors — the rotor assembly can be removed and replaced to extend pump service life rather than replacing the entire unit. The corrosion-resistant material resists the lime and calcium scale that degrades standard rotors in hard water environments.
- Self-cooling debris-flushing rotor chambers: The rotor chambers are designed to continuously flush debris while cooling the motor, preventing the overheating failures common in high-flow pumps during peak summer operation. This design sustains reliable performance in the most demanding waterfall and stream applications.
- Excels in hard water conditions: Hard water (high calcium and magnesium content) is a primary cause of premature pump failure across the US Midwest and South. Oase Waterfall Pumps are specifically engineered with corrosion-resistant components and flow paths that resist calcium scale buildup — delivering longer service intervals and reduced replacement frequency.
- Integrated grounding plate: The grounding plate within the pump body continuously dissipates stray electrical current into ground rather than allowing it to enter the pond water. Critical for fish safety and human safety in a body of water frequented by family and pets.
- 3-Year warranty (2+1 with registration): The base 2-year manufacturer warranty extends to 3 years with free online product registration at Atlantic-OASE. Same warranty structure as the Waterfall Pump 8000.
Technical Specifications
| Specification | Detail |
|---|---|
| SKU | 45425 |
| Max Flow Rate | 6,600 GPH |
| Max Head Height | 26.5 ft |
| Wattage | 460W |
| Amps | 3.8A |
| Voltage | 120V / 60Hz |
| Cord Length | 20 ft |
| Outlet | 2” MIPT |
| Inlet | 2” |
| Outlet Adapters | 1.5”–2” step fitting |
| Solids Handling | Up to 1/6” (max) |
| Motor Type | Asynchronous |
| Installation | Submersible or inline (below water level) |
| Grounding Plate | Integrated — eliminates stray current |
| Volute Access | Tool-less removal for maintenance |
| Rotor | Replaceable corrosion-resistant rotor |
| Cooling | Self-cooling, debris-flushing rotor chambers |
| Hard Water Rated | Yes — specifically engineered for hard water conditions |
| Dimensions | 12”L × 6.75”W × 8.5”H |
| Weight | 14.5 lbs |
| Safety Listing | cULus |
| Warranty | 3-Year (2-Year base + 1-Year with online registration) |
| GFCI | GFCI-protected 120V grounded outlet required |
| Not for use in | Swimming pools or salt water |
Oase Waterfall Pump Family
The 6600 and 8000 share the same housing dimensions and include inline capability, tool-less volute removal, and replaceable rotors not found on the 1650–5150 models. All models include a grounding plate and 20 ft cord.
| Model | SKU | Flow | Max Head | Watts | Amps | Inline |
|---|---|---|---|---|---|---|
| Waterfall Pump 1650 | — | 1,650 GPH | — | — | — | No |
| Waterfall Pump 2300 | — | 2,300 GPH | — | — | — | No |
| Waterfall Pump 5150 | — | 5,150 GPH | — | — | — | No |
| Waterfall Pump 6600 (this) | 45425 | 6,600 GPH | 26.5 ft | 460W | 3.8A | Yes |
| Waterfall Pump 8000 | 45426 | 8,000 GPH | 32 ft | 600W | 4.8A | Yes |
Frequently Asked Questions
What is the maximum flow rate and head height for the Oase 6600?
The Oase Waterfall Pump 6600 delivers a maximum flow of 6,600 GPH at open (zero head) flow, with a maximum head height of 26.5 feet. Flow decreases progressively as head height increases — for waterfall installations, plan pump sizing using the published performance curve for the 45425, accounting for your specific vertical lift and pipe friction losses.
If your installation requires greater than 26.5 feet of head, consider the Waterfall Pump 8000 (SKU 45426), which delivers 8,000 GPH with a 32-foot maximum head.
Is the Oase 6600 energy efficient?
Yes. The Waterfall Pump 6600 delivers 6,600 GPH on 460 watts, yielding a flow-to-wattage ratio of approximately 14.3 GPH per watt — strong performance for a high-flow asynchronous waterfall pump. Running 24/7 for a 6-month pond season at $0.15/kWh costs approximately $302 in electricity.
The asynchronous motor is specifically optimized for the high-flow, moderate-head conditions of waterfall and stream applications, delivering reliable output in the flow regimes where waterfalls typically operate.
Can this pump handle pond debris and solids?
Yes, the Waterfall Pump 6600 handles solids up to 1/6 inch (approximately 4mm). Fine fish waste, decaying leaf material, and small particles up to this size pass through the pump to the filtration system without damaging the impeller.
For particles larger than 1/6 inch, intake pre-filtration is recommended. The pump is ideal for installation in a skimmer vault or pump vault with appropriate intake screening, or in a pond bottom application where coarser debris is first separated by a basket or grate before reaching the pump intake.
What safety features does the Oase 6600 offer?
The Waterfall Pump 6600 includes two independent safety features:
- Integrated grounding plate: Continuously dissipates stray electrical current into ground, preventing any escaped current from entering the pond water. Important for koi health and for family members or pets who may come in contact with pond water.
- cULus safety listing: The pump carries the cULus (Canadian and United States) safety certification, confirming it has been independently tested and listed for electrical safety in both markets.
Additionally: the pump requires a GFCI-protected 120V grounded outlet for installation. GFCI protection provides a secondary line of defense against ground faults at the outlet level. Do not connect this pump to an unprotected outlet.
What size plumbing does the Oase 6600 require?
The Waterfall Pump 6600 features a 2” MIPT (Male Iron Pipe Thread) outlet and includes a 1.5”–2” step adapter for compatibility with either tubing size. The inlet is also 2”.
For a 6,600 GPH pump running to a waterfall or stream head, 2” plumbing throughout the discharge run minimizes friction loss and ensures the rated GPH reaches the spillway. At longer run distances or higher heads, consult a friction loss chart to confirm your tubing diameter is adequate for the intended flow rate.
Can this pump be installed outside the pond inline?
Yes — the Waterfall Pump 6600 is one of only two models in the Oase Waterfall Pump line (the 6600 and 8000) that support inline installation. In an inline configuration, the pump is mounted in a dry location outside the pond, with the intake connected by pipe to the pond and the discharge routed to the waterfall or stream head.
For inline use, the pump body must remain below the pond water surface level so the intake operates in flooded suction rather than requiring the pump to self-prime. A typical inline installation uses a pump vault or external housing positioned at the pond edge below grade, making maintenance access convenient without disturbing the pond.
The smaller Oase Waterfall Pumps (1650–5150) are submersible-only and cannot be used inline.
Why Buy Oase Products from Pond Pro Direct?
- Authentic Oase products with cULus listing and 3-Year warranty
- Pump sizing expertise — call for help matching this pump to your waterfall height, pipe run, and spillway width
- Price Match on identical Oase products from authorized retailers
Oase Waterfall Pump 6600 (45425) — 6,600 GPH | 26.5 ft max head | 460W / 3.8A | 20 ft cord | 2” MIPT | 1/6” solids | asynchronous | inline or submersible | tool-less volute | replaceable rotor | grounding plate | self-cooling rotor chambers | hard water rated | 12”×6.75”×8.5”H | 14.5 lbs | cULus | 3-Year (2+1) warranty. GFCI required. Not for pools or salt water.
Questions about waterfall sizing, pump matching, or plumbing layout? Call or text (765) 508-4352 — Monday through Friday, 9 AM to 5 PM EST.
Price Match
At Pond Pro Direct, we want you to shop with confidence, knowing you’re always getting a good deal.
We will match or beat the lowest online price on its products.
If you find a lower price for any products on our store, we will beat it by $50 for products listed over $2000. In order to be eligible, you must provide proof, whether a screenshot, invoice, email, etc. of the lower offer.
Please note that this does not apply to every product in the store, so reach out via email or chat for confirmation before purchasing.
For the policy to apply, simply send us a screenshot, link, or any other proof of the lower price.
For more information, please check out Price Match Policy Page
Shipping & Delivery
Order Processing
Orders are processed within 1–5 business days, depending on product type, brand, and fulfillment method. Products sold on Pond Pro Direct ship directly from manufacturers or authorized distribution partners and do not ship from a single centralized warehouse.
Processing times may vary by brand, item type, fulfillment method, and whether an item is made to order or ships via freight.
Order Confirmation
After placing your order, you will receive an order confirmation email confirming that we have received your order and pre-authorized your payment method.
Once your order is received, we contact the manufacturer or distribution partner to confirm availability and fulfillment timelines.
- If an item is unavailable or on backorder, we will notify you by email and void the pre-authorization.
- If the item is available, the payment will be processed and the order submitted for shipment.
Order Shipment
If your order is in stock and payment is processed, it will typically ship within 6–13 business days. Once your order ships, tracking information (when available) will be sent to the email address provided at checkout.
If you do not receive shipping confirmation within 6 business days, please contact us at support@pondprodirect.com.
Shipping Destinations
At this time, we primarily ship within the United States. Some products may be available for shipment to Canada. If the website allows checkout and accepts your shipping address, the product is eligible for delivery to that location.
Changing Your Shipping Address
Address changes after an order has been processed or shipped may result in delays or additional carrier fees. Any carrier charges associated with address changes are the responsibility of the customer.
Shipping Times
All shipping times are estimates only and not guarantees.
- Typical handling time: 1–5 business days
- Typical transit time after shipment: 5–8 business days
- Estimated delivery window: 6–13 business days
Delivery timelines may vary based on brand, item type, production status, freight requirements, and carrier availability.
If an order is cancelled after it has been processed or shipped, the customer may be responsible for applicable shipping charges, freight fees, carrier return fees, and warehouse handling costs, where applicable.
Shipping Options
Available shipping options vary by product and location.
Our standard Curbside Delivery option is provided at no additional cost where applicable and delivers the item to the curbside or driveway of the delivery address.
Additional options, such as Threshold Delivery or White Glove Delivery, may be available for select products and locations.
For full details regarding freight delivery, inspection requirements, liftgate service, returns, and customer responsibilities, please review our full Shipping Policy page.
Returns & Refunds
Cancellations & Refunds
Orders may be canceled free of charge before shipment, unless the item is classified as Custom or Made-to-Order (see below).
If you have questions about your order, please contact us at support@pondprodirect.com or call (765) 508-4352 during business hours.
Cancellations (Before Order Ships)
If you need to cancel an order before it ships, please contact us as soon as possible. Orders canceled prior to shipment are eligible for a full refund.
You can reach our team by phone at (765) 508-4352, via live chat on our website, or by email at support@pondprodirect.com.
Cancellations (After Order Ships)
Once an order has shipped or entered fulfillment, it may no longer be eligible for cancellation. If you no longer wish to keep the item, you must wait until delivery and then request a return.
A Return Merchandise Authorization (RMA) is required before returning any item.
Custom or Made-to-Order Items
Custom or made-to-order products are produced specifically for your order and cannot be canceled or refunded once production has begun, except in cases of defect or error.
Product pages will clearly indicate when an item is custom or made-to-order. If you are unsure whether an item falls into this category, please contact us before placing your order.
Returns & Refunds
Returns are subject to the following conditions:
- Customers have 30 days from delivery to request a return, unless otherwise stated on the product page or by manufacturer policy
- Items must be unused, uninstalled, and in original packaging
- An RMA is required prior to returning any item
Because we ship products directly from manufacturers, return eligibility may vary by brand. If a manufacturer does not permit returns on a specific product, we may be unable to accept the return. Please contact us if you would like confirmation of return eligibility for a specific item.
Fees & Shipping Costs
- Return shipping costs are the responsibility of the customer unless the item is defective or shipped in error
- Freight / LTL shipments may incur higher return shipping costs due to carrier fees
- Approved returns of non-defective items may be subject to a restocking fee of up to 25%
- Original outbound shipping charges are non-refundable
If you are exchanging an item rather than returning it outright, we may be able to assist with some costs depending on the product and manufacturer.
For full details, including freight deliveries, damage reporting requirements, and manufacturer-specific terms, please review our complete Return and Refund Policy
