💨 Waterway Executive 56 Spa Pump — 2.0 HP 2-Speed 230V (3720821-13)
Larger frame, cooler motor, quieter operation — engineered for lasting spa performance
📋 Product Overview
The Waterway Executive 56 (3720821-13) is a 2.0 HP, 2-speed jet pump designed, engineered, and manufactured in the USA by Waterway Plastics of Oxnard, California. This 56-frame model features a larger motor than its 48-frame counterpart, delivering added strength, cooler operating temperatures, and longer motor life. The oversized 2-1/2 inch intake port reduces noise and improves water flow performance, while the large 6-1/2 inch diameter Executive wet end provides higher head pressure and energy efficiency. Operating at 8.0 amps on high speed and 3.0 amps on low speed at 230V/60Hz, the motor features two double-shielded ball bearings with moisture-resistant grease for quieter operation, four sets of insulated windings for increased efficiency, and a split capacitor (start and run) for reduced energy consumption. The wet end features silicone carbide seals with Viton bellows and 316 stainless steel casing for superior corrosion resistance against chlorine, bromine, and salt systems. Thermally protected, with a rotatable wet end adjustable every 90 degrees. This pump does not include unions or a pump cord.
✨ Key Features
- ✅ 2.0 HP Dual-Speed Motor — High speed (8.0A / 3,450 RPM) for powerful jets, low speed (3.0A / 1,725 RPM) for quiet filtration
- ✅ 56-Frame Motor — Larger frame delivers added strength, cooler operating temperature, and longer motor life compared to 48-frame pumps
- ✅ Made in the USA — Designed, engineered, and manufactured by Waterway Plastics in Oxnard, California
- ✅ Oversized 2-1/2″ Intake — Larger suction port for improved flow performance and reduced noise
- ✅ Executive Wet End — Large 6-1/2 inch diameter wet end specifically designed for 56-frame motors, delivering higher head pressure
- ✅ Double-Shielded Ball Bearings — Two moisture-resistant greased bearings for quieter operation and longer bearing life
- ✅ Split Capacitor Design — Start and run capacitor configuration for reduced energy consumption
- ✅ Silicone Carbide Seal System — Viton bellows and 316 stainless steel casing for corrosion resistance against chlorine, bromine, and salt
- ✅ Four Sets of Insulated Windings — Dual-speed motor design for increased electrical efficiency
- ✅ Thermal Overload Protection — Automatic motor protection extends life expectancy and prevents overheating
- ✅ Rotatable Wet End — Can be rotated every 90 degrees for flexible installation alignment
⚙️ Technical Specifications
| Specification | Value |
|---|---|
| Pump Type | Jet Pump (2-Speed) |
| Model / Part Number | 3720821-13 |
| Alternate Part Number | PF-10-2N22M (replaces older PF-20-2N22C) |
| Manufacturer | Waterway Plastics, Inc. (Oxnard, CA, USA) |
| Series | Executive 56-Frame |
| Motor Power | 2.0 HP |
| Speed Settings | 2-Speed (High / Low) |
| Voltage | 230V |
| Frequency | 60 Hz |
| Amperage (High Speed) | 8.0 A |
| Amperage (Low Speed) | 3.0 A |
| High Speed RPM | 3,450 RPM |
| Low Speed RPM | 1,725 RPM |
| Frame Type | 56 Frame |
| Wet End Diameter | 6-1/2 inches |
| Suction Port (Intake) | 2-1/2 inch (Thread OD approximately 3-5/8 inches) |
| Discharge Port | 2 inch (Thread OD approximately 3 inches) — Side Discharge |
| Port Position | Center Suction / Side Discharge |
| Discharge Rotation | Every 90° (multiple positions) |
| Bearings | Two double-shielded ball bearings with moisture-resistant grease |
| Capacitor | Split capacitor (start and run) |
| Motor Windings | Four sets of insulated windings (2-speed) |
| Dimension “A” (Motor Length) | 8.875 inches |
| Weight | 34 lbs |
| Seal Type | Silicone Carbide / Viton Bellows / 316SS Casing |
| Unions Included | No — unions NOT included (sold separately) |
| Pump Cord | NOT included (sold separately or reuse existing) |
| Country of Origin | USA |
| Warranty | 3 Years on motor and wet end (Manufacturer) |
🔌 Electrical Requirements
| Electrical Spec | Requirement |
|---|---|
| Supply Voltage | 230V |
| Frequency | 60 Hz |
| Phase | Single Phase |
| Full Load Amps (High Speed) | 8.0 A |
| Full Load Amps (Low Speed) | 3.0 A |
| Wiring (2-Speed) | 4-wire connection — High, Low, Common, Ground |
Wiring Color Code (Per Waterway Manual 810-0199):
| Wire Function | Standard Color | Americord Color |
|---|---|---|
| Common | Blue | White |
| Low Speed | Brown | Black |
| High Speed | Black | Red |
| Ground | Green | Green |
Wiring Notes (Per Waterway Manual):
- For wiring instructions, refer to the wiring diagram on the motor nameplate or on the back of the terminal cover.
- Applied voltage must correspond to rated voltage as indicated on the marking plate.
- All wiring must conform to local, state, and/or national codes.
- Ground motor prior to connecting electrical power. Do NOT ground to a gas supply line.
- 2-Speed models: Do NOT wire both speeds to run simultaneously.
⚠️ IMPORTANT ELECTRICAL SAFETY:
- All electrical work must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes.
- Hot tubs require GFCI (Ground Fault Circuit Interrupter) protection.
- A dedicated circuit is required — do not share with other appliances.
- Improper grounding can cause serious injury and damage to the motor, voiding the warranty.
- If the supply cord is damaged, it must be replaced by a special cord or assembly available from the manufacturer or its service agent.
- The pump cord is NOT included. Reuse your existing pump cord or purchase a compatible replacement separately.
🔗 Compatibility Guide
This Pump:
- 📍 Frame: 56 Frame
- 📍 Wet End Diameter: 6-1/2 inches
- 📍 Suction (Intake): 2-1/2 inch (Thread OD approximately 3-5/8 inches)
- 📍 Discharge: 2 inch (Thread OD approximately 3 inches) — Side Discharge
- 📍 Discharge Rotation: Every 90 degrees
- 📍 Unions: Waterway male union threads — unions NOT included with this pump
Known Replacements (Per Authorized Distributors):
This pump replaces the following models with similar specifications:
- Beachcomber Master Massage pumps (1.5HP and 2HP)
- Beachcomber Aquastorm pump
- Waterway Super-Flo pump
- Infinity 2HP Spa pump
- Older PF-15-2N22C and PF-20-2N22C models
⚠️ Important: Do not select a replacement pump based on horsepower alone. HP ratings on hot tub pumps are often listed as SPL-HP, BHP, MBHP, RHP, or S-HP, which differ from continuous operating horsepower. Instead, confirm the frame size (48 vs 56) and match the high-speed amperage rating from the old pump’s label for an accurate replacement.
Union Compatibility Note:
Unions are NOT included with this pump. There is no industry standard for pump unions — various brands have their own unique style and thread size. When replacing a pump from another brand, you may need to cut off your old unions and install compatible Waterway unions (sold separately).
Other Executive 56-Frame 2-Speed Models in This Series (Manufacturer Data):
| Part Number | Plumbing | HP | Amps (High/Low) | Weight |
|---|---|---|---|---|
| 3720821-1D | 2″ × 2″ | 2 HP | 8.0 / 3.0 A | 34 lbs |
| 3720821-13 | 2-1/2″ × 2″ | 2 HP | 8.0 / 3.0 A | 34 lbs |
| ME-30226-20 | 2″ × 2″ | 3 HP | 10.0 / 3.4 A | 37 lbs |
| ME-40226-20 | 2″ × 2″ | 4 HP | 12.0 / 4.4 A | 44 lbs |
| ME-40226-25 | 2-1/2″ × 2″ | 4 HP | 12.0 / 4.4 A | 44 lbs |
| 3722021-1D | 2″ × 2″ | 5 HP | 16.4 / 4.8 A | 47 lbs |
| 3722021-13 | 2-1/2″ × 2″ | 5 HP | 16.4 / 4.8 A | 46 lbs |
🛠️ Installation Requirements
Mounting (Per Waterway Manual 810-0199):
| Requirement | Specification |
|---|---|
| Mounting Position | Horizontal, on level surface |
| Location | Must be installed below water surface (flooded suction) |
| Base Surface | Level surface, clear of direct water with adequate floor drainage |
| Moisture Protection | Pump should be protected from excessive moisture |
| Ventilation | Motor louvered openings must be free from debris and obstructions |
| Shut-Off Valves | Should be installed on both inlet and outlet for future maintenance |
Plumbing:
| Connection | Size |
|---|---|
| Suction (Inlet) | 2-1/2 inch (Waterway male union threads, Thread OD ~3-5/8″) |
| Discharge (Outlet) | 2 inch (Waterway male union threads, side, Thread OD ~3″) |
| Unions Included | No — sold separately |
Plumbing Notes (Per Waterway Manual):
- Use Waterway tailpiece assemblies for best connection. Unions allow pump removal for service without disturbing the plumbing.
- HAND TIGHTEN UNIONS ONLY — Do NOT use a wrench or any adhesives or solvents.
- Do NOT use pipe dope. Use only Teflon tape or other sealing compounds approved for use with plastic. Some pipe dopes will cause stress cracking of plastic parts.
- Pressure tests should not exceed 40 PSI. Ensure all air is removed during pressure testing.
Installation Notes:
- ⚠️ Pump must be installed below water level (flooded suction)
- ⚠️ Do NOT run the pump without water — if pump fails to prime within 30 seconds, turn it off and check for air lock, clogged plumbing, or closed valves
- ⚠️ Ensure proper grounding and bonding per NEC requirements
- ⚠️ GFCI protection is required by code for all hot tub and spa installations
- ⚠️ Wet end ships at factory default discharge position — loosen the 4 motor thru-bolts to rotate if needed
🔧 Maintenance Guide
Routine Maintenance:
| Task | Frequency | Notes |
|---|---|---|
| Check for leaks | Monthly | Inspect around seal plate and union connections |
| Inspect unions | Monthly | Hand tighten only if needed |
| Keep motor clean | Ongoing | Ensure louvered openings are free from debris and obstructions |
| Check amperage draw | Annually | Should match rated values (8.0A high / 3.0A low) within 10% |
| Inspect mounting | Quarterly | Ensure pump is secure and level |
| Check shaft seal | Periodically | Over time, seals may become damaged or worn and must be replaced |
Warning Signs — Replace Pump If:
- Unusual noise (grinding, screeching, bearing noise, or rotor rub)
- Water leaking from the seal area
- Motor repeatedly trips the circuit breaker
- Noticeably reduced water flow through jets
- Motor overheating or shutting down during operation
- Motor hums but won’t start (capacitor or winding switch failure)
Seal Replacement:
- 📍 Seal Material: Silicone Carbide face / Viton Bellows / 316 Stainless Steel Casing
- 📍 Compatibility: Waterway Executive 56 frame pumps
- ⚠️ Replace seal at first sign of leakage to prevent motor damage
Winterization (Per Waterway Manual):
To prevent damage during freezing conditions, disconnect all electrical power, drain the pump thoroughly, and clean out any debris. Protect pump and motor from elements by covering, or if possible, store in a dry, well-ventilated room.
🎯 Ideal Applications
| Application | Suitability | Notes |
|---|---|---|
| ♨️ Hot tub jet pump | Yes | Primary application — high speed for jets, low speed for filtration |
| ♨️ Spa circulation | Yes | Low speed provides quiet, energy-efficient circulation |
| 🛁 Whirlpool bath | Yes | Compatible with permanently installed whirlpool bath systems using 230V power |
⚠️ Per Waterway: This pump is for use with permanently installed pools and may also be used with hot tubs and spas if so marked. Do not use with storable pools.
Alternate Part Numbers
- 1-00-0091
- 372082113
- WW372082113
- 5039-209
- 15-350-0025
- PF-20-2N22C
- P220E5252024
- PF-15-2N22C
- 3720821-0385
- 3720821-83
- 372082113
- PF202N22C
❓ Frequently Asked Questions
Q: What horsepower is this pump? A: The Waterway Executive 3720821-13 is rated at 2.0 HP per the manufacturer’s official specification table at waterwayplastics.com.
Q: Will this fit my hot tub? A: This pump has a 56 frame with 2-1/2 inch intake and 2 inch side discharge. To confirm compatibility, check your existing pump for: (1) frame size — 48 or 56, (2) port sizes — intake and discharge, and (3) high-speed amperage rating on the pump label. Matching amperage is more reliable than matching horsepower alone.
Q: What is the difference between this pump (3720821-13) and the 3720821-1D? A: The 3720821-13 has a larger 2-1/2 inch intake and 2 inch discharge, while the 3720821-1D has 2 inch intake and 2 inch discharge. All other specifications (HP, amps, frame, motor) are identical. Choose based on your existing plumbing size.
Q: What voltage does this pump require? A: 230V / 60Hz. All electrical installation must be performed by a licensed electrician with GFCI protection. Verify your existing voltage before ordering.
Q: Is this a single or dual speed pump? A: This is a 2-speed pump. High speed (8.0A) delivers powerful jet massage at 3,450 RPM, while low speed (3.0A) provides quiet filtration and circulation at 1,725 RPM.
Q: What size are the ports? A: Suction (intake): 2-1/2 inch (thread OD approximately 3-5/8 inches). Discharge (outlet): 2 inch (thread OD approximately 3 inches), side discharge.
Q: Are unions or a pump cord included? A: No, unions and pump cord are NOT included with this pump. You can reuse your existing pump cord or purchase a compatible replacement. When removing the power cord from an existing pump, mark your wires for “common,” “high speed,” and “low speed.”
Q: Can I rotate the discharge direction? A: Yes. The wet end ships at the factory default discharge position. To rotate, loosen the 4 motor thru-bolts on the back of the motor and turn the pump head. The discharge can be rotated every 90 degrees.
Q: What seal does this pump use? A: Silicone carbide face with Viton bellows and 316 stainless steel casing. This premium seal system provides superior corrosion resistance against chlorine, bromine, and salt systems.
Q: Is this pump made in the USA? A: Yes. Waterway Plastics designs, engineers, and manufactures their Executive pumps in Oxnard, California, USA.
Q: What does the PF- model number mean? Does the “C” or “M” at the end matter? A: The PF- model number is Waterway’s internal designation. The last letter (C or M) references only the motor brand — C = Century/A.O. Smith, M = U.S. Motors. It does not need to be matched when selecting a replacement pump. Waterway has produced up to 4 variations of pumps with the same PF- prefix, so the PF- number from an old pump should not be used as the sole reference for selecting a replacement.
Q: What warranty is included? A: 3-year manufacturer warranty on motor and wet end per Waterway’s published catalog specifications. Contact Parts4Tubs for full warranty terms and claims.
Q: How much does this pump weigh? A: 34 lbs per the manufacturer’s official specification.
Q: Why is this pump 56-frame instead of 48-frame? A: The 56-frame motor is physically larger than the 48-frame, providing added strength, cooler operating temperature, and longer motor life. It draws lower amperage (8.0A high vs. 10.5A high on the 48-frame 2HP) while delivering the same 2.0 HP output, making it more energy efficient.
Q: Do I need a GFCI breaker? A: Yes, GFCI (Ground Fault Circuit Interrupter) protection is required by the National Electrical Code (NEC) for all hot tub and spa installations.
📥 Downloads & Resources
📄 56-Frame Executive Pump Installation Manual (PDF) — Official Waterway 56-frame instructions, wiring diagram with color codes, troubleshooting, and exploded view diagram
📄 48/56-Frame Executive, EX2 & Viper Pump Manual (PDF) — Additional Waterway installation instructions and troubleshooting
🏆 Why Choose the Waterway Executive 3720821-13
- ✅ Made in the USA — Designed, engineered, and manufactured by Waterway Plastics in Oxnard, California for over 50 years
- ✅ 56-Frame Advantage — Larger motor runs cooler, stronger, and lasts longer than 48-frame equivalents
- ✅ Larger 2-1/2″ Intake — Improved flow performance and reduced noise compared to standard 2″ intake pumps
- ✅ Double-Shielded Bearings — Moisture-resistant grease-packed bearings for quieter, longer-lasting operation
- ✅ Premium Seal Technology — Silicone carbide with Viton bellows and 316SS casing resists chlorine, bromine, and salt corrosion
- ✅ Energy Efficient — Split capacitor design and four insulated windings reduce energy consumption
- ✅ Thermal Overload Protection — Automatic motor protection prevents overheating and extends pump life
- ✅ 3-Year Warranty — Manufacturer warranty on both motor and wet end
🤝 Why Buy From Parts4Tubs
- ✅ US-based support for American customers
- ✅ Fast shipping across the United States
- ✅ Expert advice from spa and hot tub specialists
- ✅ Competitive pricing
- ✅ Full warranty support
- ✅ Hassle-free returns
- ✅ Replacement seals, wet ends, and pump parts available
- ✅ Dedicated customer service team
🌟 Summary
The Waterway Executive 3720821-13 is a 2.0 HP, 2-speed, 230V American-made jet pump featuring a 56 frame, oversized 2-1/2 inch intake, large 6-1/2 inch Executive wet end with premium silicone carbide/Viton/316SS seal system, and rotatable discharge for flexible installation. With double-shielded ball bearings, split capacitor design, and four sets of insulated windings, this 34 lb pump operates at 8.0/3.0A (3,450/1,725 RPM) and is backed by a 3-year manufacturer warranty on motor and wet end. Order today from Parts4Tubs for fast US shipping and expert support.
Union, Pump, Magic, 1-1/2"S x 1-1/2"FBT (Industry Standard) w/ O-Ring | ||
Union, Pump, Magic, 2"S x 2"FBT (Industry Standard) w/ O-Ring | ||
Union, Pump, Waterway, 2-1/2"FBT x 2-1/2"S | ||
Amp Plug, Pump, 1-Speed, 14/3, 4-Pin, 5' Cord, White | ||
Amp Plug, Pump 1 (2-Speed) 14/4, 72" Long, White |
Hot Tub Pump Collar & Union Size Chart
| Union Size | Collar Size | Thread OD | Union OD | O-Ring Size |
|---|---|---|---|---|
|
1.5"
Female Buttress
Thread (FBT) |
2.5" / 64mm
(Tip to Tip)
Measurement |
2-1/2"
64mm
|
2-13/16"
71mm
|
2-5/16" OD
59mm
|
|
2"
Female Buttress
Thread (FBT) |
3.1" / 78mm
(Tip to Tip)
Measurement |
3-1/16"
78mm
|
3-3/8"
81mm
|
2-15/16" OD
75mm
|
|
2.5"
Female Buttress
Thread (FBT) |
3.6" / 91mm
(Tip to Tip)
Measurement |
3-5/8"
91mm
|
4-1/4"
108mm
|
3-7/16" OD
87mm
|
Important Notes
How do I Replace a Hot Tub Pump?
Here's a general step-by-step guide on how to replace a hot tub pump. Keep in mind that the specific steps may vary depending on your hot tub's make and model, so it's essential to consult your hot tub's manual for model-specific instructions. If you're not comfortable with this procedure, it's a good idea to seek professional assistance.
Materials You'll Need:
- Replacement pump
- Pipe wrench
- Adjustable wrench
- Screwdriver
- Pipe sealant (thread tape or plumber's putty)
- PVC primer and cement (if you have PVC plumbing)
- Teflon tape (for threaded connections)
Procedure:
-
Turn Off the Power: Before you begin, ensure the hot tub's power supply is turned off at the circuit breaker or disconnect switch. Safety should always be a priority when working with electrical components.
-
Drain the Hot Tub: If your hot tub is not already empty, you'll need to drain it. Follow your hot tub's manual or manufacturer's instructions for proper draining. (You might not need to do this if you can lock the pump off with the gate valves)
-
Locate the Pump: Identify the location of the existing pump in your hot tub. It's usually located near the equipment area or in a designated pump compartment.
-
Disconnect the Electrical Wiring: Carefully disconnect the electrical wiring from the old pump. This typically involves removing the electrical conduit cover, unscrewing wire nuts, and disconnecting the wires from the terminals. Be sure to note the wire connections or take a picture for reference when connecting the new pump.
-
Disconnect the Plumbing: Depending on your hot tub's plumbing setup, you'll need to disconnect the plumbing connections to the pump. Use a pipe wrench or adjustable wrench to loosen and remove the fittings. Be prepared for some water spillage when disconnecting the plumbing.
-
Remove the Old Pump: Once the electrical and plumbing connections are detached, carefully remove the old pump from its mounting position. Some pumps may be secured with mounting brackets or bolts.
-
Prepare the New Pump: If the new pump is not pre-assembled, you may need to attach fittings, unions, or adapters to match your hot tub's plumbing. Ensure that you use the appropriate sealant or Teflon tape on threaded connections to prevent leaks.
-
Mount the New Pump: Position the new pump in the same location as the old one and secure it in place using the mounting brackets or bolts.
-
Reconnect Plumbing: Reconnect the plumbing to the new pump, ensuring that all connections are tight and secure. If your hot tub uses PVC plumbing, use PVC primer and cement to bond the connections properly.
-
Reconnect Electrical Wiring: Reconnect the electrical wiring to the new pump, following the notes or pictures you took earlier. Make sure all wires are properly connected and secure.
-
Turn On the Power: Restore power to the hot tub by switching on the circuit breaker or reconnecting the disconnect switch.
-
Test the Pump: Turn on the hot tub's pump to ensure that it's working correctly. Check for any signs of leaks or irregularities in the plumbing connections.
-
Refill the Hot Tub: Once you've confirmed that the new pump is functioning properly, refill the hot tub with water.
-
Check for Leaks: Inspect the plumbing connections for any leaks. If you find any, turn off the pump, drain the tub again, and reseal the connections as needed.
-
Monitor: Keep an eye on the pump and plumbing for the next few days to ensure everything is functioning correctly and that there are no further issues.
Remember that this is a general guideline, and the specific steps may vary based on your hot tub's design. If you're unsure or uncomfortable with any aspect of this process, please do get in touch, happy to help.
How do I know what size hot tub pump I have?
Determining the size of your hot tub pump is an important step when it comes to maintenance or replacement. To find out the size of your hot tub pump, follow these steps:
-
Check the Manual: The easiest way to determine the size of your hot tub pump is to consult the owner's manual or user documentation that came with your hot tub. The manual typically contains detailed information about the specifications and components of your hot tub, including the pump.
-
Look at the Pump Housing: If you don't have access to the manual or it doesn't provide the information you need, inspect the pump itself. Most hot tub pumps have a label or plate on the pump housing that displays essential details, including the pump's model number, manufacturer, and specifications. You can then send that to me or Google it.
-
Measure the Pump: If the label is missing or damaged, you can measure the pump's dimensions. Measure the diameter of the pump's wet end (the part where the water flows) and the length of the wet end. These measurements can help identify the size and capacity of the pump.
-
Consult the Manufacturer: If you can't find the information on the pump or in the manual, contact the hot tub manufacturer or a reputable dealer. Provide them with your hot tub's model and serial number, and they should be able to identify the correct pump size for your specific hot tub.
-
Online Research: You can also search online using the pump's model number or hot tub's make and model. Many manufacturers provide detailed information about their products on their websites, and you may find specifications for your pump model.
Once you have determined the size and specifications of your hot tub pump, you can proceed with maintenance, repairs, or replacement if necessary. Keep in mind that replacing a hot tub pump with the same size and capacity as the original is crucial to ensure proper water circulation and filtration in your hot tub. If you're unsure about any aspect of this process, get in touch, always happy to help.










