🔧 Waterway Genesis Generation Spa & Bath Pump – 1.0 HP Single-Speed | 115V | 321JF10-1150

Whisper-quiet operation with dependable jet power for your spa or whirlpool bath

💧 Product Overview

The Waterway Genesis Generation 321JF10-1150 is a 1.0 HP single-speed energy-efficient bath and spa pump engineered for quiet, reliable performance in whirlpool baths, jetted tubs, and portable spas. Built by Waterway Plastics — an American manufacturer with over 50 years of expertise — this pump delivers smooth, powerful water flow through a compact, vibration-dampened design.

Featuring a center discharge wet end with 1-1/2″ Male Buttress Thread (MBT) connections on both suction and discharge, the Genesis is designed as a true plug-and-play solution. It ships complete with a 3-foot NEMA power cord (3-prong plug) and a factory-installed air switch, allowing convenient on/off control from the tub deck. Three anti-vibration mounting pads are included to minimize noise and vibration during operation.

The wet end is constructed from a high-strength glass-reinforced co-polymer material — the same advanced material used in Waterway’s premium pool pumps and filters — ensuring exceptional durability and long service life. The thermally protected motor safeguards against overheating, providing peace of mind during extended use. UL and CSA listed for safety, this pump is a trusted replacement for many OEM bath pump installations across the United States.

⭐ Key Features

• ✅ 1.0 HP Single-Speed Motor – Delivers strong, consistent jet performance at 3,450 RPM for a powerful hydrotherapy experience
• ✅ Energy-Efficient Design – Engineered for lower power consumption without sacrificing water flow or pressure
• ✅ Center Discharge Wet End – 1-1/2″ MBT suction and discharge ports for straightforward plumbing connections
• ✅ Plug-and-Play Installation – Includes 3-foot NEMA power cord (3-prong plug) and factory-installed air switch for immediate setup
• ✅ Quiet Operation – Purpose-built quiet wet end combined with three anti-vibration mounting pads for near-silent running
• ✅ Thermally Protected Motor – Built-in thermal overload protection prevents motor damage from overheating
• ✅ Glass-Reinforced Co-Polymer Wet End – Advanced material provides superior strength and chemical resistance for extended lifespan
• ✅ Self-Draining Design – Prevents water from sitting in the pump when not in use, reducing the risk of bacterial growth
• ✅ 48Y Frame Motor – Industry-standard frame size for broad compatibility with existing installations
• ✅ UL & CSA Listed – Independently tested and certified for electrical safety in the US and Canada
• ✅ 1-Year Manufacturer Warranty – Backed by Waterway Plastics for quality assurance

⚙️ Technical Specifications

Specification	Detail
Brand	Waterway Plastics
Model	Genesis Generation
Part Number (SKU)	321JF10-1150
OEM Part Number	321JF10-0150 (without air switch/NEMA cord)
Pump Type	Bath / Spa Jet Pump
Horsepower	1.0 HP
Speed	Single-Speed
RPM	3,450
Voltage	115V
Frequency	60 Hz
Amperage (Full Load)	9.5A
Frame Type	48Y
Discharge Type	Center Discharge
Discharge Port Size	1-1/2″ MBT (Male Buttress Thread)
Suction Port Size	1-1/2″ MBT (Male Buttress Thread)
Thread OD (Across Threads)	Approximately 2-3/8″ (fits standard 1.5″ FBT unions)
Cord Type	3′ NEMA Power Cord (3-Prong Plug)
Air Switch	Included (factory-installed)
Motor Protection	Thermally Protected
Wet End Material	Glass-Reinforced Co-Polymer
Mounting Pads	Anti-Vibration Pads Included
Certifications	UL Listed, CSA Listed
Warranty	1 Year Manufacturer Warranty

⚠️ Amperage Note: This pump is commonly marketed as the “9.0 Amp” Genesis model. However, the Waterway manufacturer’s specification table lists the full-load amperage as 9.5A. Plan your electrical circuit accordingly based on the 9.5A rating.

📐 Dimensions

Dimension	Measurement
Height (A)	7.79 in
Height with Anti-Vibration Pads	8.165 in
Floor to Discharge Center (B)	2.51 in
Length (C)	12.07 in
Pump Body Diameter	5.23 in
Overall Width	5.73 in

All dimensions sourced from the official Waterway Plastics bath pump catalog.

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	115V
Frequency	60 Hz
Phase	Single Phase
Full Load Amps	9.5A
Cord	3′ NEMA, 3-Prong Plug
Activation	Air Switch (included)

⚠️ IMPORTANT:

All electrical work must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes. Hot tubs and spas require GFCI (Ground Fault Circuit Interrupter) protection. A dedicated circuit is required — do not share with other appliances. Verify your existing circuit can handle the 9.5A draw at 115V before installation.

🔗 Compatibility Guide

Plumbing Connections:

• 📍 Frame: 48Y
• 📍 Discharge: 1-1/2″ MBT — Center Discharge
• 📍 Suction: 1-1/2″ MBT
• 📍 Thread OD: Approximately 2-3/8″ (standard 1.5″ Female Buttress Thread union compatible)

Union Sizing Reference:

Union Size	Collar Size (Tip to Tip)	Thread OD
1.5″ Female Buttress Thread (FBT)	2.5″ / 64mm	2-1/2″ (64mm)

⚠️ Note: This pump does not include unions. Unions must be purchased separately. The standard 1.5″ FBT pump union (such as Magic Plastics 0602-15) is compatible with this pump.

Verified Replacement For:

This pump is a direct or compatible replacement for the following OEM and aftermarket pumps:

• Hydr-O-Power bath pumps
• BT7305 Hydrabaths pumps
• EGIS bath pumps
• Emerson bath pumps
• LX model WCA50
• Gruber Hydro bath pumps
• Hydrodynamic bath pumps

Known Cross-Reference / Alternate Part Numbers:

1-00-0125PK, 321JF100150, 321JF10-0150, 15-350-2290, WW100, 34-270-2004, 607500CD-RS, 5014-003, 310-2130, A002E88C, R75A-C, WW321JF100150, 0002F88C, 0005E88C, 0009F88C, 0010E88C, 0010F88C, 001F88C, 0034F88C, 0036F88C, NR2A-C

🛠️ Installation Requirements

Mounting:

Requirement	Specification
Mounting Position	Horizontal
Base	Solid, level surface
Vibration Dampening	3 anti-vibration pads included
Ventilation	Ensure adequate airflow around motor for cooling
Access	Allow sufficient clearance for maintenance and plumbing access

Plumbing:

Connection	Size	Type
Suction	1-1/2″	Male Buttress Thread (MBT)
Discharge	1-1/2″	Male Buttress Thread (MBT) — Center

Additional Plumbing Notes:

There are two barbed fittings on the face of the pump for small auxiliary lines. These come from the factory plugged. If needed for your installation, they can be drilled out easily.

Installation Notes:

• ⚠️ Pump must be installed below water level (flooded suction) to ensure proper priming
• ⚠️ Never run the pump dry — this causes immediate seal damage
• ⚠️ Ensure proper grounding and bonding per NEC requirements
• ⚠️ GFCI protection is required by code for all hot tub and spa installations
• ⚠️ Use Teflon tape or appropriate pipe sealant on all threaded connections to prevent leaks
• ⚠️ Unions are not included and must be purchased separately

🔄 Maintenance Guide

Routine Maintenance:

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around seal plate and union connections
Inspect unions & connections	Monthly	Tighten if needed; check for drips
Clean strainer/filter	As needed	Remove any debris blocking flow
Check amperage draw	Annually	Should read at or near the 9.5A rating
Inspect motor vents	Quarterly	Keep clear of dust, debris, and obstructions
Check mounting pads	Quarterly	Replace if worn or compressed
Verify air switch operation	Quarterly	Test on/off function from tub-side button

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, or humming without starting)
• Water leaking from the seal plate area
• Motor trips the circuit breaker repeatedly
• Noticeably reduced water flow or jet pressure
• Motor overheating or shutting off during use
• Visible corrosion or cracking on the wet end housing

Seal Replacement:

• 📍 Replacement Seal Part Number: 35-423-1060
• ⚠️ The Waterway Genesis uses a different seal than other Waterway pump models (such as the Executive or Hi-Flo). The standard Waterway 319-3100B seal does not fit the Genesis pump. Always verify you have the correct Genesis-specific seal before replacement.
• ⚠️ Replace the seal at the first sign of leakage to prevent motor damage

🎯 Ideal Applications

Application	Suitability	Notes
♨️ Hot tub / spa jet pump	✅ Yes	Excellent for single-pump spa systems and replacement applications
🛁 Whirlpool bath / jetted tub	✅ Yes	Primary design application — plug-and-play with air switch
♨️ Above-ground / portable spa	✅ Yes	Compact size and NEMA plug make it ideal for portable installations
♨️ Pedicure spa / chair	✅ Yes	Commonly used as a replacement pump in pedicure spa systems

❓ Frequently Asked Questions

Q: What horsepower is this pump? A: This is a 1.0 HP single-speed pump running at 3,450 RPM on 115V/60Hz.

Q: Will this fit my hot tub or whirlpool bath? A: This pump has a 48Y frame with 1-1/2″ MBT (Male Buttress Thread) connections on both the suction and center discharge. Measure your existing pump’s port size (the thread outside diameter should be approximately 2-3/8″) and confirm it uses the same frame type and connection style before ordering.

Q: What voltage does this pump require? A: 115V / 60Hz. This pump comes with a 3-foot NEMA power cord with a 3-prong plug. All electrical installation must comply with the NEC and be performed by a licensed electrician.

Q: What are the amp requirements? A: The full-load amperage is 9.5A at 115V. Ensure your circuit and breaker can handle this draw. The pump is often marketed as “9.0 Amp” but the manufacturer specification is 9.5A.

Q: Does this pump come with unions? A: No. Unions are sold separately. You will need two 1.5″ Female Buttress Thread (FBT) pump unions, such as the Magic Plastics 0602-15, to complete the installation.

Q: Does it include an air switch? A: Yes. The 321JF10-1150 model includes a factory-installed air switch and 3-foot NEMA power cord. The air switch allows you to turn the pump on and off from a tub-side button. Note: The air tubing and air button are not included — only the air switch mechanism on the pump.

Q: What size are the ports? A: Both suction and discharge ports are 1-1/2″ MBT (Male Buttress Thread) with a thread outside diameter of approximately 2-3/8″. The discharge is center-mounted.

Q: What warranty is included? A: This pump comes with a 1-year manufacturer warranty from Waterway Plastics. Contact Parts4Tubs for full warranty terms and claims support.

Q: How do I know if my pump needs replacing? A: Common signs include unusual noise (grinding or screeching), water leaking from the seal area, reduced water flow, the motor repeatedly tripping the breaker, or the motor overheating and shutting off.

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, spa, and whirlpool bath installations.

Q: What is the difference between 321JF10-1150 and 321JF10-0150? A: Both are the same 9.0/9.5A Genesis pump. The 321JF10-1150 is the individual retail unit (quantity 1) with air switch and NEMA cord. The 321JF10-0150 is the same pump but is the OEM/bulk packaging part number (quantity 18 per case).

Q: What seal does this pump use? A: The Waterway Genesis uses seal part number 35-423-1060. This is a Genesis-specific seal — the standard Waterway 319-3100B seal used on Executive and Hi-Flo pumps does not fit the Genesis.

📥 Downloads & Resources

📄 Waterway Genesis Generation Bath Pump Catalog (PDF) – Full specifications, dimensions, performance curves, and accessories

🏆 Why Choose the Waterway Genesis 321JF10-1150

• ✅ Powerful 1.0 HP motor delivers strong, consistent jet performance at 3,450 RPM
• ✅ American-made quality from Waterway Plastics — over 50 years of pool and spa manufacturing expertise in Oxnard, California
• ✅ Whisper-quiet operation with a purpose-built quiet wet end and anti-vibration mounting pads
• ✅ Energy-efficient design keeps electricity costs down without sacrificing performance
• ✅ Plug-and-play convenience with included NEMA cord and factory air switch — no complex wiring required
• ✅ Durable co-polymer wet end made from the same advanced glass-reinforced material used in Waterway’s premium pool equipment
• ✅ UL & CSA listed for verified electrical safety and peace of mind
• ✅ 1-year manufacturer warranty backed by Waterway Plastics

🤝 Why Buy from Parts4Tubs

• ✅ US-based support for American customers — located in Boca Raton, Florida
• ✅ Fast shipping across the United States
• ✅ Expert advice from spa and hot tub specialists
• ✅ Competitive pricing in USD
• ✅ Full warranty support
• ✅ Hassle-free returns
• ✅ Replacement seals, unions, and pump parts available
• ✅ Dedicated customer service team — you’re buying from a person, not just the internet

✨ Summary

The Waterway Genesis Generation 321JF10-1150 is a 1.0 HP, single-speed, 115V energy-efficient bath and spa pump designed for quiet, reliable performance. Featuring a center discharge wet end with 1-1/2″ MBT connections, a factory-installed air switch, NEMA power cord, and anti-vibration pads, this pump delivers true plug-and-play convenience. UL and CSA listed with a 1-year manufacturer warranty, it’s a proven replacement for a wide range of OEM bath pump installations. Order yours today from Parts4Tubs for fast US shipping and expert support.

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	Magic Plastics Union 0602-15 (1.5″ Pump Union) | 1-1/2″S x 1-1/2″FBT Union, Pump, Magic, 1-1/2"S x 1-1/2"FBT (Industry Standard) w/ O-Ring	$6.36 Max: 586 Min: 1 Step: 1 Add to cart
	Magic Plastics Union 0602-20 (2″ Pump Union) | 2″S x 2″FBT w/ O-Ring Union, Pump, Magic, 2"S x 2"FBT (Industry Standard) w/ O-Ring	$8.00 Max: 503 Min: 1 Step: 1 Add to cart
	Waterway Union 400-6010 | 2-1/2″ Union Nut with 2-1/2″ Slip tailpiece and o-ring (2.5″ union) Union, Pump, Waterway, 2-1/2"FBT x 2-1/2"S	$14.77 Max: 149 Min: 1 Step: 1 Add to cart
	1 Speed Pump / Blower / AMP Cord | 21086 Amp Plug, Pump, 1-Speed, 14/3, 4-Pin, 5' Cord, White	$24.71 Max: 333 Min: 1 Step: 1 Add to cart
	Balboa Amp Plug 21087 (For 2 Speed Pumps) Amp Plug, Pump 1 (2-Speed) 14/4, 72" Long, White	$31.72 Max: 167 Min: 1 Step: 1 Add to cart

Hot Tub Pump Collar & Union Size Chart

Imperial & Metric Specifications

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

The union "size" (1.5", 2", 2.5") is nominal and doesn't correspond to any actual measurement.

Collar size is measured from thread tip to thread tip on the pump outlet.

Most hot tub pumps use Female Buttress Thread (FBT) - 98% of applications.

O-ring gaskets may vary between manufacturers - measure your existing gasket for accuracy.

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:

1. 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.

2. 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)

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

11. Turn On the Power: Restore power to the hot tub by switching on the circuit breaker or reconnecting the disconnect switch.

12. 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.

13. Refill the Hot Tub: Once you've confirmed that the new pump is functioning properly, refill the hot tub with water.

14. 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.

15. 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:

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.