✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
Description
HCP FN-21U 1 HP High-Head Effluent Pump for Long or Uphill Runs
Product Overview
The HCP FN-21U submersible effluent pump moves effluent and light sewage at up to 88 GPM (about 5,280 GPH), and its 1 HP motor reaches 47 ft of head for long low-pressure sewer runs and uphill transfer to mound systems. A non-clog vortex impeller passes solids up to 1-3/8 inches (35 mm).
Quick Specs
- Horsepower: 1 HP (0.75 kW)
- Voltage / Phase: 120V 1-phase (10 A), also 208/240V 3-phase (3.6 A) and 575V 3-phase (1.4 A), 60 Hz
- Discharge: 2 inch (50 mm), Female NPT
- Max Flow: 88 GPM (about 5,280 GPH)
- Max Head: 47 ft
- Solids Handling: 1-3/8 inch (35 mm)
- Impeller: Non-clog vortex
- Cord: 30 ft, 3-prong 120V plug
Key Features of HCP FN-21U Submersible Effluent Pumps
- At 1 HP, the FN-21U reaches 47 ft of head, high for a 1 HP effluent pump, so it moves effluent over longer low-pressure sewer runs and up to mound and treatment systems that stall a smaller pump.
- The non-clog vortex impeller passes solids up to 1-3/8 inch (35 mm), and an open inlet with no strainer lets stringy solids pass straight into the volute.
- Three motor options, 120V single-phase plus 208/240V and 575V three-phase, cover residential through light-commercial service.
- Twin mechanical seals, carbon/ceramic over silicon carbide, run in an oil bath to keep sewage out of the motor. The 120V model adds an auto-cut thermal protector and a moisture sensor.
- A cast-iron (FC200) casing and 304 stainless steel motor frame, IP68 sealed, are rated for permanent submersion to 33 ft (10 m).
Specifications
| Category | Details |
|---|---|
| Brand | HCP |
| Model | FN-21U |
| SKU (by voltage) | FN-21U-6117EPE3NX (120V), FN-21U-63AOEXE4NX (240V), FN-21U-635OEXE4NX (575V) |
| Product Type | Submersible effluent / light-sewage pump |
| Motor Output | 1 HP (0.75 kW); input 1.1 kW (120V), 1.05 kW (3-phase) |
| Voltage Options | 120V 1-phase, 208/240V 3-phase, 575V 3-phase, 60 Hz |
| Rated Current | 10 A (120V), 3.6 A (240V 3-ph), 1.4 A (575V 3-ph) |
| Start Method | Capacitor (120V), DOL (3-phase) |
| Speed | 3420 rpm (2 pole) |
| Insulation Class | B |
| Discharge | 2 inch (50 mm), Female NPT |
| Max Flow | 88 GPM (about 5,280 GPH) |
| Max Head | 47 ft |
| Solids Handling | 1-3/8 inch (35 mm) |
| Inlet | Open (no strainer), passes solids |
| Impeller | Non-clog vortex, PA+G50 (glass reinforced) |
| Mechanical Seal | Double (carbon/ceramic upper, silicon carbide lower), oil-filled (VG32, 190 cc) |
| Casing / Volute | Cast iron (FC200) |
| Motor Frame | 304 stainless steel (SUS304) |
| Shaft | SUS410 stainless |
| Cooling | External |
| Protection Devices | Auto-cut thermal protector and moisture sensor (120V 1-phase); external overload for 3-phase |
| Ingress Protection | IP68 |
| Max Submersion Depth | 33 ft (10 m) |
| Max Liquid Temp | 104F (40C) |
| Max Starts per Hour | 10 |
| Cord | 30 ft, SJOW (120V) / SOW (3-phase), 3-prong 120V plug |
| Weight | 35 lb (16 kg) 1-phase; 33 lb (15 kg) 3-phase, less cable |
| Certifications | cUL (UL778), CSA C22.2 No. 108-14 |
| Manufacturer | HCP Pump Manufacturer Co., Ltd. |
Performance Overview
The FN-21U delivers up to 88 GPM at low head and holds useful flow as head climbs, reaching about 47 ft at shutoff. That combination clears longer and higher effluent runs than a 0.5 HP pump.
FN-2.5U vs FN-21U
Both are FN-series effluent pumps that pass 1-3/8 inch solids. The FN-21U is the 1 HP step-up.
| Spec | FN-2.5U (0.5 HP) | FN-21U (1 HP) |
|---|---|---|
| Max flow | 70 GPM | 88 GPM |
| Max head | 34 ft | 47 ft |
| Rated current (120V) | 6 A | 10 A |
| Solids | 1-3/8 inch (35 mm) | 1-3/8 inch (35 mm) |
| Best for | Shorter runs, lower lift | Longer runs, higher lift |
Applications
- Effluent transfer from septic and treatment tanks
- Long low-pressure sewer (LPS) runs and pressurized dosing
- Uphill transfer to mound and aerobic on-site systems
- Below-grade effluent and light-sewage basins in homes and commercial buildings
- Effluent chambers, lift pits, and pump vaults
Set it in a basin with a check valve and control panel from the sewage pump accessories collection.
Buy the HCP FN-21U Submersible Effluent Pump Online from Cleanflow
When effluent has to travel far or uphill, the HCP FN-21U submersible effluent pump brings 1 HP, 88 GPM, and 47 ft of head to the job while passing 1-3/8 inch solids. Cleanflow Utility Supply Company is an authorized HCP dealer, stocking and shipping HCP pumps across Canada and the continental USA, with free shipping on orders over $199.
Browse the full effluent pumps range, then add the FN-21U Submersible Effluent Pump to your cart or contact us to size the right pump for your run.
Frequently Asked Questions
Does the HCP FN-21U replace the F-21U?
Yes. The FN-21U is HCP's replacement for the discontinued F-21U, keeping the 1 HP, 2-inch effluent format with an updated FN-series motor. It comes in 120V, 240V, and 575V, so an F-21U swaps out without changing the discharge.
FN-2.5U or FN-21U, which do I need?
Both pass 1-3/8 inch solids. Choose the 0.5 HP FN-2.5U for shorter runs at lower lift (70 GPM, 34 ft). Choose the 1 HP FN-21U when you need more flow (88 GPM) and more head (47 ft), for longer or uphill effluent runs.
What size solids does the FN-21U pass?
Up to 1-3/8 inch (35 mm), through a non-clog vortex impeller. That covers effluent and light sewage. For raw sewage with 2 inch solids, use a full sewage ejector.
How much head does the FN-21U have, and how much flow?
About 47 ft of head and up to 88 GPM (roughly 5,280 GPH), with flow highest at low lift. That head is higher than most 1 HP effluent and sewage pumps, so it fits longer low-pressure sewer runs and low-pressure mound dosing. It is not a spray-irrigation high-head effluent pump, which needs 100 ft or more.
Is the FN-21U certified, and does it have motor protection?
Yes. It carries CSA C22.2 No. 108-14 and cUL (UL778), with an IP68-sealed motor. The 120V model includes an auto-cut thermal protector and a moisture sensor; the three-phase models use external overload protection.
Manuals & Documentation
✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
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