OASE Waterfall Pump 1650 High-Flow Pond & Waterfall Pump
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The OASE Waterfall Pump 1650 (SKU 45421) is a compact synchronous magnetic-drive submersible pump rated at 1,650 GPH maximum with a 16.5-foot maximum head, drawing just 70 watts — the lowest power consumption of any pump in the OASE Waterfall Pump family. At approximately 23.6 GPH per watt, the WP 1650 delivers the best efficiency ratio in the lineup, making it the ideal choice for smaller ponds and waterfalls where minimizing operating costs is a priority alongside reliable, continuous flow.
OASE’s standard engineering package is included: integrated grounding plate for electrical safety, replaceable coated magnetic rotors for hard-water resistance, self-cooling back-spitting rotor chamber to prevent thermal failure, and tool-less volute removal for fast field maintenance. 20-foot power cord. Backed by a 3-year total warranty (2 years standard + 1 year with free online registration).
Key Features & Benefits
Technical Specifications
| Specification | Value |
|---|---|
| SKU | 45421 |
| Max Flow Rate | 1,650 GPH |
| Max Head Height | 16.5 ft |
| Flow at 10 ft Head | ~700 GPH |
| Motor Type | Synchronous magnetic drive (oil-free) |
| Wattage | 70W |
| Amperage | 0.75A |
| Voltage | 120V / 60Hz |
| Duty Rating | Continuous operation (24/7) |
| Power Cord | 20 ft |
| Outlet | 1.25” MIPT |
| Outlet Step Fitting | 1.5”–2” step adapter |
| Hose Adapters Included | 1” and 1.5” |
| Coarse Debris Handling | Up to approx. 1/6” |
| Dimensions (L × W × H) | 8.4” × 5” × 6.23” |
| Weight | 7.90 lbs |
| Installation | Submersed only (not inline-capable) |
| Safety Listing | cULus |
| Not Approved For | Swimming pools or saltwater |
| Electrical Safety | GFCI-protected outlet required |
| Warranty | 3-Year Total: 2 years standard + 1 year with online registration |
OASE Waterfall Pump Family — Efficiency Comparison
| Model | SKU | Max Flow | Max Head | Watts | GPH/W | Annual Cost* |
|---|---|---|---|---|---|---|
| WP 1650 ← This | 45421 | 1,650 GPH | 16.5 ft | 70W | 23.6 | ~$92 |
| WP 2300 | 45422 | 2,300 GPH | 20 ft | 130W | 17.7 | ~$170 |
| WP 3700 | 45423 | 3,700 GPH | 21 ft | 170W | 21.8 | ~$223 |
| WP 5150 | 45424 | 5,150 GPH | 23 ft | 230W | 22.4 | ~$302 |
| WP 6600 | 45425 | 6,600 GPH | 26.5 ft | 460W | 14.3 | ~$604 |
| WP 8000 | 45426 | 8,000 GPH | 32 ft | 650W | 12.3 | ~$854 |
*Annual cost estimated at $0.15/kWh, 24/7 operation. All models include grounding plate, replaceable rotors, self-cooling chamber, tool-less volute removal, 20 ft cord. 3-year warranty (2+1 registration) across entire family. Inline capability on WP 6600 and 8000 only.
Frequently Asked Questions
What is the maximum flow rate and head height for the OASE Waterfall Pump 1650?
The OASE Waterfall Pump 1650 (SKU 45421) delivers a maximum flow of 1,650 GPH with a maximum head height of 16.5 feet. Flow decreases as head height increases:
- At 10 ft head: approximately 700 GPH
- Maximum head (zero flow): 16.5 ft
For waterfall heights above 16.5 ft, or if you need more than 700 GPH at a 10-foot head, consider the WP 2300 (SKU 45422, max 20 ft, 1,350 GPH at 10 ft). Always size your pump at your actual installation head height, not the maximum flow figure.
Can this pump handle pond debris and solids?
The OASE Waterfall Pump 1650 handles coarse debris up to approximately 1/6 inch passing through to a downstream filter. The self-cooling back-spitting rotor chamber continuously flushes fine particles through the rear of the pump during operation, keeping ceramic bearings and shafts clean in real time. For best performance, install the pump in a skimmer box or pump vault with a debris screen on the inlet side to prevent larger material from reaching the impeller.
Is the OASE WP 1650 energy efficient for 24/7 operation?
Yes — the WP 1650 is the most energy-efficient pump in the entire OASE Waterfall Pump family. It draws just 70 watts for 1,650 GPH output (23.6 GPH/W), which is better than any other model in the six-pump lineup. At typical residential electricity rates, 24/7 operation costs approximately $92 per year. The next-larger model (WP 2300 at 130W) costs approximately $170/year to run. If your pond requires 1,200–1,650 GPH, the 1650 offers exceptional long-term operating economy.
What safety features does this pump offer for koi ponds?
The OASE Waterfall Pump 1650 includes:
- Grounding plate — diverts stray electrical current away from pond water continuously; protects koi, fish, and anyone touching the water
- Oil-free synchronous magnetic drive — eliminates all oil contamination risk in pond water
- Ceramic shafts and bearings — resist hard-water mineral scaling
- cULus safety listed
A GFCI-protected 120V outlet is required. Not approved for swimming pools or saltwater.
What size plumbing does the OASE Waterfall Pump 1650 require?
The WP 1650 features a 1.25” MIPT outlet with a 1.5”–2” step outlet fitting included. The pump ships with 1” and 1.5” hose adapters for the most common return-line sizes. For maximum flow efficiency at 1,650 GPH, use the largest practical pipe size (1.5”) with minimal elbows on the discharge run to reduce friction head loss.
Why Buy from Pond Pro Direct?
- Authentic OASE products with 3-year warranty (register online for the extra year)
- Expert pump sizing guidance — call or text (765) 508-4352, Mon–Fri 9am–5pm EST
- Free shipping on all orders
- Price match guarantee on identical products
- 30-day return period on eligible items
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
