EasyPro TH400 TH Series 5,100 GPH Waterfall & Stream Pump – High-Flow Submersible Pump for Pondless Waterfalls
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Description
The EasyPro TH400 TH Series Waterfall & Stream Pump delivers 5,100 GPH of high-flow, continuous-duty water movement for medium-to-large waterfalls, long streams, pondless waterfall systems, and koi ponds. Part of EasyPro’s best-selling TH Series, the TH400 is trusted by pond builders across North America for its corrosion-resistant stainless steel motor housing, abrasion-resistant fiber-reinforced plastic casing, vortex impeller design that resists clogging, and built-in overload and overheat motor protection. With a 2” FPT discharge, 1/2 HP direct-drive motor, 32-foot max head, and compact 10”×17.5” footprint ideal for use in skimmers, the TH400 is one of the pond industry’s best-selling waterfall pumps. Backed by a 2-Year Warranty.
Why Choose the EasyPro TH400 Waterfall Pump?
- Direct-drive 1/2 HP motor: Delivers reliable 5,100 GPH at open flow — enough to power medium and large waterfalls, long streams, and high-volume pondless systems without straining the motor in 24/7 continuous operation.
- Corrosion-resistant stainless steel motor housing: The motor is enclosed in a stainless steel housing specifically designed for continuous submersion, resisting the corrosion that destroys standard cast iron or aluminum pump housings over time.
- Abrasion-resistant fiber-reinforced plastic casing: The outer pump casing is built from fiber-reinforced plastic, providing impact and abrasion resistance that extends pump life even in skimmer environments where debris and grit contact the exterior.
- Vortex impeller design prevents clogging: The impeller geometry creates a whirlpool effect that moves debris through the pump rather than jamming it, dramatically reducing the maintenance stops caused by impeller clogs common with flat-impeller pumps.
- Built-in overload and overheat protection: If the pump becomes clogged or overheated during continuous operation, the built-in protection circuit shuts the motor off before it burns out — then automatically resets once the condition clears.
- 410 stainless steel shaft and PPO glass-fiber impeller: The pump shaft is precision 410 stainless steel and the impeller is Poly(p-phenylene oxide) reinforced with 20% glass fiber — materials chosen for corrosion resistance and dimensional stability in continuous wet use.
- Oil-free design — fish and plant safe: Double silicon carbide mechanical seals keep the motor completely oil-free, eliminating any risk of oil contamination in your pond or water feature.
- Compact footprint ideal for skimmers: At 10” diameter × 17.5” tall, the TH400 is sized to fit inside most standard pond skimmer pump vaults. Verify your skimmer’s internal depth exceeds 17.5” for full submersion.
Technical Specifications
| Specification | Detail |
|---|---|
| Model | EasyPro TH400 |
| Max Flow Rate | 5,100 GPH (at open flow) |
| Horsepower | 1/2 HP |
| Voltage | 115V |
| Wattage | ≈400 Watts |
| Amps | 3.7–6.0A (rated: 5.6A) |
| Max Head Height | 32 ft |
| Discharge Outlet | 2” FPT (female threaded port) |
| Cord Length | 20 ft (standard) — see TH400-50 and TH400-100 for 50 ft and 100 ft options |
| Dimensions | 10” diameter × 17.5” tall |
| Motor Type | Direct Drive |
| Motor Housing | Corrosion-resistant stainless steel |
| Pump Casing | Abrasion-resistant fiber-reinforced plastic |
| Shaft | 410 stainless steel |
| Impeller | PPO + 20% glass fiber (vortex design) |
| Seals | Double silicon carbide mechanical seals (oil-free) |
| Overload Protection | Built-in overload and overheat motor protection |
| Electrical | Must be connected to a properly grounded, GFCI-protected 120V outdoor outlet |
| Warranty | 2-Year Limited Warranty |
| Not approved for | Swimming pools or salt water |
Flow Rate Performance Chart
Approximate flow rates at various head heights — from EasyPro’s published TH Series performance data:
| Head Height | Flow Rate | Typical Application |
|---|---|---|
| 0 ft (open flow) | 5,100 GPH | No vertical lift |
| 5 ft | 4,440 GPH | Short waterfall, low basin |
| 10 ft | 3,780 GPH | Standard backyard waterfall |
| 15 ft | 3,420 GPH | Tall residential waterfall |
| 20 ft | 2,880 GPH | Long stream + waterfall combined |
| 32 ft (max head) | 0 GPH | Maximum head — zero flow |
For waterfall applications, add approximately 1 foot of head for every 10 feet of horizontal pipe run to account for friction loss. Use 2” flexible PVC or larger to maintain optimal flow.
What’s Included & Cord Options
Included with TH400
- EasyPro TH400 pump
- 20 ft power cord
- Protective intake screen
- Owner’s manual
Cord Length Variants (Same Pump)
- TH400 — 20 ft cord (this listing)
- TH400-50 — 50 ft cord
- TH400-100 — 100 ft cord
- Call (765) 508-4352 to order 50 ft or 100 ft variants
EasyPro TH Series Family Comparison
All TH Series pumps share the same stainless steel motor housing, fiber-reinforced plastic casing, vortex impeller, 2” FPT discharge, direct-drive motor, and 2-year warranty. Choose by GPH and head height for your specific waterfall or stream:
| Model | Max GPH | HP | Watts | Amps | Max Head | Dimensions | At 10 ft | At 20 ft |
|---|---|---|---|---|---|---|---|---|
| TH150 | 2,900 | 1/4 | 150W | 2.9A | 21 ft | 10"×15" | 1,920 GPH | 720 GPH |
| TH250 | 3,900 | 1/3 | 250W | 4.0A | 27 ft | 10"×15" | 2,760 GPH | 1,440 GPH |
| TH400 (this) | 5,100 | 1/2 | 400W | 5.6A | 32 ft | 10"×17.5" | 3,780 GPH | 2,880 GPH |
| TH750 | 6,000 | 1 | 750W | 9.5A | 43 ft | 10"×17.5" | 5,340 GPH | 4,740 GPH |
Ideal Applications
- Medium and large backyard waterfalls (8–20 ft head)
- Long streams (50–75 ft combined with moderate head)
- Pondless waterfall systems
- Koi ponds and water gardens requiring strong, consistent circulation
- Pond skimmer installations (compact 10”×17.5” footprint)
- Submersible applications in skimmer vaults or pump chambers
Installation & Plumbing Notes
- Discharge is 2” FPT (female threaded) — connect with 2” male threaded PVC fittings; use 2” flexible PVC pipe or larger for optimal flow with minimum friction loss
- A 2” check valve is strongly recommended to prevent backflow and air-lock when the pump cycles off
- Pump must be fully submerged in water at all times during operation — verify skimmer or vault internal depth exceeds 17.5 inches
- Must be connected to a properly grounded, GFCI-protected 120V outdoor outlet
- For long pipe runs, add approximately 1 ft of equivalent head for every 10 ft of horizontal run when sizing
- Not approved for use in swimming pools or salt water
Winterization
- If your water feature will freeze, remove the pump before ice formation
- Rinse and dry the exterior thoroughly
- Store in a frost-free indoor location
- Place pump in a bucket with approximately 8 inches of water to prevent silicon carbide seals from drying out during storage — dried seals are the #1 cause of premature seal failure
Frequently Asked Questions
What is the maximum flow rate and head height of the EasyPro TH400?
The TH400 delivers a maximum of 5,100 GPH at open flow (0 ft head) and has a maximum head height of 32 feet. At typical waterfall operating heights:
- 5 ft head: 4,440 GPH
- 10 ft head: 3,780 GPH
- 15 ft head: 3,420 GPH
- 20 ft head: 2,880 GPH
For sizing guidance, measure your waterfall’s vertical height from the water surface to the top of the falls, then add 1 ft of head for every 10 ft of horizontal pipe run to account for friction loss. Call (765) 508-4352 for personalized pump sizing help.
Why is the TH400’s vortex impeller design better for waterfall and skimmer use?
The TH400 uses a vortex impeller that creates a whirlpool effect inside the pump chamber. Instead of forcing debris directly through the impeller blades (as flat-impeller pumps do), the vortex pulls water and small solids through with minimal contact with the impeller itself. This means organic debris, small leaves, and fine particles that make it past the intake screen are less likely to jam the impeller.
For skimmer installations, this is especially valuable: the skimmer net and brush panel catch large debris, but fine organic material can still reach the pump. The vortex design handles this without requiring pump disassembly to clear clogs.
The TH400 also features built-in overload and overheat protection — if a clog does occur, the motor shuts off automatically to prevent burnout, then resets once the obstruction clears.
How much power does the TH400 use in 24/7 continuous operation?
The TH400 operates at approximately 400 watts at its rated operating point on 115V, with an amp draw range of 3.7–6.0 amps depending on head pressure (lower head = higher flow = higher amp draw; higher head = reduced flow = lower amp draw).
At 400W continuous, annual operating cost at $0.12/kWh is approximately $420/year for 24/7 operation. Running the pump only during daytime hours (12 hrs/day) reduces this to approximately $210/year.
The stainless steel motor housing is air-filled for maximum heat dissipation, allowing the motor to run cool continuously even during the hottest summer months. The built-in thermal protection provides an additional safety layer if the pump does begin to overheat.
Is the EasyPro TH400 safe for koi and goldfish ponds?
Yes. The TH400 is completely fish-safe. It uses an oil-free design with double silicon carbide mechanical seals that prevent any oil or lubricant from entering the water. Unlike older motor designs that used oil-filled housings, the TH400’s dry-motor design eliminates any risk of oil contamination that could harm koi, goldfish, or aquatic plants.
Note: The TH400 is not approved for salt water applications. Salt water accelerates corrosion of metal components, including the stainless steel housing, and can void the warranty.
What size plumbing and fittings do I need for the TH400?
The TH400 features a 2” FPT (female threaded port) vertical discharge outlet. You will need:
- 2” male threaded PVC fitting to connect at the pump outlet
- 2” flexible PVC pipe (or rigid 2” PVC) for the supply run — using 2” or larger minimizes friction loss and maximizes delivered flow
- 2” check valve (strongly recommended) to prevent backflow and air-lock when the pump stops
Do not reduce to 1.5” pipe — undersizing the pipe increases friction loss significantly at 5,100 GPH flow rates, reducing delivered flow and increasing pump load.
What cord length options are available for the TH400?
The TH400 is available in three cord lengths — same pump, different cord:
- TH400 — 20 ft cord (this listing)
- TH400-50 — 50 ft cord
- TH400-100 — 100 ft cord
Choose based on the distance from your pond or skimmer to the nearest GFCI-protected outdoor outlet. Never use an extension cord with a submersible pump — the cord variants exist specifically to eliminate this need. Call (765) 508-4352 to order the 50 ft or 100 ft variant.
How do I winterize my EasyPro TH400 waterfall pump?
For climates where water features freeze:
- Remove the pump before ice formation — ice can crack the casing and damage seals
- Rinse thoroughly and dry the exterior
- Store indoors in a frost-free location
- Important: Place the pump in a bucket with approximately 8 inches of water during storage. The double silicon carbide mechanical seals can dry out and crack if stored completely dry — dried seals are the leading cause of premature pump failure after winter storage
For year-round climates where the feature runs continuously, no seasonal maintenance is required beyond periodic intake screen cleaning.
Why Buy from Pond Pro Direct?
- Authentic EasyPro products with full 2-year warranty coverage
- Pond sizing expertise — call Mon–Fri 9 AM–5 PM EST for waterfall sizing, pipe sizing, and system design
- Price Match on identical products from authorized retailers
- TH400-50 and TH400-100 cord variants available — call to order
EasyPro TH400 — 5,100 GPH | 1/2 HP | 400W | 3.7–6.0A | 32’ max head | 2” FPT | 10”×17.5” | direct drive | stainless housing | vortex impeller | oil-free seals | overload protection | 20 ft cord | 2-year warranty. Also available: TH400-50 (50 ft cord) and TH400-100 (100 ft cord). Not for salt water or pools. GFCI required.
Questions about sizing for your waterfall or stream? Call or text (765) 508-4352 — Monday through Friday, 9 AM to 5 PM EST.
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