OASE Waterfall Pump 3700 High-Flow Pond & Waterfall Pump
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Description
The OASE Waterfall Pump 3700 (SKU 45423) is a high-volume, energy-efficient synchronous magnetic-drive submersible pump rated at 3,700 GPH maximum with a 21-foot maximum head. At only 170 watts, it delivers exceptional efficiency for its output class — comparable to traditional pumps drawing 250+ watts for the same flow. Purpose-built for pond waterfalls, pondless waterfall features, and stream applications, it performs reliably at head heights up to 21 ft.
OASE’s engineering differentiators set this pump apart: an integrated grounding plate eliminates stray electrical current from pond water, replaceable coated magnetic rotors survive hard water conditions, the self-cooling back-spitting rotor chamber prevents thermal failure, and tool-less volute removal makes maintenance fast. Backed by a 3-year total warranty (2 years standard + 1 year with free online registration).
Key Features & Benefits
Technical Specifications
| Specification | Value |
|---|---|
| SKU / MPN | 45423 |
| Max Flow Rate | 3,700 GPH |
| Max Head Height | 21 ft |
| Flow at 10 ft Head | ~2,300 GPH |
| Motor Type | Synchronous magnetic drive (oil-free) |
| Wattage | 170W |
| Amperage | 2.2A |
| Voltage | 120V / 60Hz |
| Duty Rating | Continuous operation (24/7) |
| Power Cord | 20 ft |
| Outlet | 1.5” |
| Hose Adapters Included | 1” and 1.5” step adapters |
| Coarse Debris Handling | Up to approx 1/6” |
| Filter Intake Surface | 150 cm² |
| Dimensions (L × W × H) | 9.4” × 5.4” × 6.5” |
| Weight | 8.80 lbs |
| Installation | Submersed only (not inline-capable) |
| Not Approved For | Swimming pools or saltwater |
| Electrical Safety | GFCI-protected outlet required |
| Warranty | 3-Year Total: 2 years standard + 1 year with free online product registration |
OASE Waterfall Pump Family Comparison
| Model | SKU | Max Flow | Max Head | Watts | Inline? |
|---|---|---|---|---|---|
| Waterfall Pump 1650 | 45421 | 1,650 GPH | 16 ft | 40W | No |
| Waterfall Pump 2300 | 45422 | 2,300 GPH | 16 ft | 77W | No |
| Waterfall Pump 3700 ← This | 45423 | 3,700 GPH | 21 ft | 170W | No |
| Waterfall Pump 5150 | 45424 | 5,150 GPH | 23 ft | 230W | No |
| Waterfall Pump 6600 | 45425 | 6,600 GPH | 26 ft | 340W | Yes |
| Waterfall Pump 8000 | 45426 | 8,000 GPH | 29 ft | 400W | Yes |
All models include: grounding plate, replaceable coated rotors, tool-less volute removal, self-cooling back-spitting rotor chamber, ceramic shafts and bearings, 20 ft cord, 3-year warranty. The 6600 and 8000 additionally support inline (dry-mount external) installation.
Frequently Asked Questions
What is the maximum flow rate and head height for the OASE Waterfall Pump 3700?
The OASE Waterfall Pump 3700 (SKU 45423) delivers a maximum flow of 3,700 GPH with a maximum head height of 21 feet. Flow decreases as head height increases — at a common 10-foot residential waterfall, output is approximately 2,300 GPH, which suits a 24” Colorfalls spillway or a moderate naturalistic waterfall. For waterfall heights above 21 ft, step up to the 5150 or 6600.
Is the OASE 3700 pump energy efficient?
Yes. The OASE Waterfall Pump 3700 uses a synchronous magnetic-drive motor that consumes only 170 watts for 3,700 GPH of output — approximately 21.8 GPH per watt. Compared to conventional direct-drive pumps in the same flow class typically drawing 280-350 watts, the 3700 reduces annual electricity costs by $25-$50 for typical 24/7 pond operation. The oil-free synchronous design also requires no lubrication maintenance and provides long-term reliability in hard water conditions.
Can this pump handle pond debris and solids?
The OASE Waterfall Pump 3700 features a high cleaning force design that allows coarse debris particles up to approximately 1/6 inch to pass through to a filter. The self-cooling, debris-flushing rotor chamber continuously moves fine particles through the rear of the pump, keeping ceramic shafts and bearings clean without manual intervention. For best performance and longevity, use the pump in a skimmer box or with an appropriately sized pre-filter cage to prevent oversized debris from reaching the impeller.
What safety features does the OASE 3700 offer?
The OASE Waterfall Pump 3700 includes several safety features:
- Grounding plate — OASE’s unique electrical safety feature eliminates stray current from entering pond water, protecting fish, aquatic plants, and anyone in contact with the water or pond edge
- Oil-free synchronous magnetic drive — eliminates oil contamination risk entirely
- Ceramic shafts and bearings — resist the hard water mineral deposits that cause most mag-drive pump failures
A properly grounded GFCI-protected 120V outlet is required for installation. The pump is not approved for swimming pools or saltwater applications.
What size plumbing does the OASE 3700 require?
The OASE Waterfall Pump 3700 features a 1.5-inch outlet and ships with two hose adapters: 1-inch and 1.5-inch step fittings, covering the most common pondless waterfall and skimmer return-line sizes. For maximum efficiency at 3,700 GPH, use 1.5-inch pipe on the discharge side with minimal elbows to reduce friction loss. The smaller 1-inch adapter is suitable for reduced-flow configurations or where smaller plumbing is already installed.
Why Buy from Pond Pro Direct?
- Authentic OASE products with full 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
