🔧 LX Lingxiao WBH100 Bath Pump — 0.75 HP 115V 7.0A Single-Speed Whirlpool Bath Pump with Air Switch, NEMA Cord & Unions

Cost-effective replacement for Balboa WOW and Waterway Genesis bath pumps — complete with cord, unions, and air switch

💧 Product Overview

The LX WBH100 is a 0.75 HP, 115V, 7.0A single-speed whirlpool bath pump manufactured by Guangdong Lingxiao (LX Pumps), one of the largest bath and spa pump manufacturers in China with over 46 years of production experience. It features a front/top wet end configuration with center discharge and bottom suction, using standard 1-1/2″ Male Buttress Thread (MBT) connections that measure 2-7/16″ OD.

The WBH100 is a complete ready-to-install package — it includes a 3-foot NEMA power cord with plug, two 1-1/2″ unions with o-rings, and a built-in air switch. This makes it a popular and cost-effective direct replacement for the Balboa Vico WOW 1050032 and Waterway Genesis 321HF10-0150/321HF10-1150 bath pumps. The pump features a glass reinforced composite housing, dry run mechanical seal, self-draining volute, and an air-cooled pure copper winding motor rated for continuous duty with IPX4 protection.

⚠️ HP RATING NOTE: Most US distributors and the Parts4Tubs listing rate this pump at 0.75 HP (3/4 HP), which matches the 7.0A draw and 0.75 kW input power. Some sources, including LX’s own model numbering convention (WBH100 = 1.0 HP), list it as 1.0 HP. Always match by amperage (7.0A) and physical dimensions when selecting a replacement pump — the amperage is consistent across all sources.

⚠️ THIS IS A WHIRLPOOL BATH PUMP — designed for jetted bathtubs only. Not intended for continuous hot tub/spa circulation use.

⭐ Key Features

• ✅ 0.75 HP Single-Speed Motor — 115V / 60Hz / 7.0A — pure copper winding for quiet, efficient operation
• ✅ Complete Package — 3′ NEMA cord with plug, two 1-1/2″ unions with o-rings, and built-in air switch all included
• ✅ Direct Replacement — Replaces Balboa Vico WOW 1050032, Waterway Genesis 321HF10-0150/321HF10-1150, and other 3/4 HP bath pumps
• ✅ Self-Draining Volute — Water drains automatically when pump turns off, preventing stagnant water buildup
• ✅ Dry Run Mechanical Seal — Designed for reliability in bath pump applications with intermittent use
• ✅ Glass Reinforced Composite Housing — High-strength engineering plastic for corrosion resistance and durability
• ✅ Air-Cooled Motor — Aluminum front and back covers with excellent heat dissipation
• ✅ 1-1/2″ MBT Connections — Standard Male Buttress Thread (measures 2-7/16″ OD) — fits most whirlpool bath plumbing
• ✅ UL Recognized & CSA Certified — IPX4 protection, Class B insulation, continuous duty rated
• ✅ 1-Year Manufacturer Warranty — Shaft seal carries 3-month part-only warranty

⚙️ Technical Specifications

Specification	Value
Manufacturer	Guangdong Lingxiao (LX Pumps)
Model	WBH100 (with cord) / WCH100 (without cord)
Pump Type	Whirlpool bath pump (front/top wet end)
Motor Power	0.75 HP (3/4 HP) — see HP Rating Note above
Input Power	0.75 kW
Speed	Single speed
RPM	3,450
Flow Rate	90 GPM
Voltage	115V
Frequency	60 Hz
Amperage	7.0A
Frame Type	48 Frame Thru-Bolt
Suction Port	1-1/2″ MBT — bottom (measures 2-7/16″ OD)
Discharge Port	1-1/2″ MBT — center (measures 2-7/16″ OD)
Dimensions (L × W × H)	13-3/16″ × 5-1/4″ × 6-15/16″
Housing Material	Glass reinforced composite
Seal Type	Dry run mechanical seal
Self-Draining	Yes
Motor Type	Air-cooled, pure copper winding
Insulation	Class B
Protection Rating	IPX4
Duty Rating	Continuous
Certifications	UL Recognized, CSA Certified
Warranty	1 year manufacturer (shaft seal: 3 months part only)

🔌 Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	115V (110-120V)
Frequency	60 Hz
Phase	Single
Full Load Amps	7.0A
Minimum Circuit Breaker	15A
Wire Size (Recommended)	14 AWG

⚠️ IMPORTANT:

All electrical work must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes. Whirlpool bath installations require GFCI (Ground Fault Circuit Interrupter) protection. A dedicated circuit is recommended — do not share with other high-draw appliances.

⚠️ Air button and 1/4″ air hose are sold separately. The pump has a built-in air switch but requires an external air button (typically mounted on the bath tub surface) connected via 1/4″ air tubing. Standard air button hole size: 1-3/8″ for a 1-3/4″ diameter air button.

🔗 WBH100 vs WCH100 — What’s the Difference?

Feature	WBH100	WCH100
3′ NEMA Power Cord	✅ Included	❌ Not included — reuse old cord
Unions	✅ Included (2x with o-rings)	✅ Included (2x with o-rings)
Air Switch	✅ Built-in	✅ Built-in
Motor & Specs	Identical	Identical
Dimensions	13-3/16″ × 5-1/4″ × 6-15/16″	13-3/16″ × 5-1/4″ × 6-15/16″

The WBH100 includes a 3-foot NEMA power cord with plug — ready to plug in immediately. The WCH100 does not include a power cord — you must transfer the cord from your old pump onto this new one. All other specifications are identical.

💡 Choose WBH100 if your old pump’s cord is damaged, if you prefer a fresh cord, or for first-time installations. Choose WCH100 if your existing cord is in good condition and you want to save a few dollars.

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🔄 Compatibility & Cross-Reference Guide

Direct Replacement For:

Pump	Brand	HP	Amps	Notes
1050032 / 1010032	Balboa Vico WOW	3/4 HP	7.5A	Same plumbing footprint
321HF10-0150	Waterway Genesis	3/4 HP	7.5A	With NEMA cord & air switch
321HF10-1150	Waterway Genesis	3/4 HP	7.5A	Older model (replaced by 321HF10-0150)
LD7A-C	Hydro Air / Balboa	—	—	Legacy bath pump

Alternate / Cross-Reference Part Numbers:

Part Number	Source / Brand
WBH100	LX Lingxiao (with cord)
WCH100	LX Lingxiao (without cord)
34-343-1015	OEM cross-reference
1-00-0057	OEM cross-reference
LD7A-C	Hydro Air (Balboa legacy)
390589	OEM cross-reference
755072-301	OEM cross-reference

Plumbing Compatibility:

📍 Frame: 48 Frame Thru-Bolt
📍 Suction: 1-1/2" MBT — bottom (measures 2-7/16" OD)
📍 Discharge: 1-1/2" MBT — center (measures 2-7/16" OD)
📍 Unions: Included (1-1/2" with o-rings)

⚠️ IMPORTANT: The LX WBH100 has very similar dimensions to the Vico WOW and Waterway Genesis bath pumps but is not dimensionally identical. The WBH100 measures 13-3/16″ × 5-1/4″ × 6-15/16″ compared to the Vico WOW’s 13.5″ × 4.85″ × 7.2″ and the Waterway Genesis’s 12-1/2″ × 5-3/8″ × 7-1/4″. Plumbing connections (1-1/2″ MBT) are compatible, but verify physical clearance in your installation space before ordering.

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⚠️ HP Rating Discrepancy — Important Information

The LX WBH100 has a widely documented HP rating discrepancy across retailers:

Source	Listed HP	Listed Amps
Spa Parts Plus (Parts4Tubs)	0.75 HP	7.0A
SpaCare	3/4 HP	7.0A
Hot Tub Outpost	3/4 HP	7.0A
BathParts	0.75 HP	7.0A
Pool-Spa-Supplies	0.75 HP	7.0A
LX Model Numbering (WBH100)	1.0 HP	7.0A
LX Official Website (lingxiaopumps.com)	1.0 HP	7.0A
INYOPools	1 HP	7A

Why the discrepancy? LX’s model numbering convention uses the number to indicate HP (WBH100 = 1.0 HP), but the pump’s input power is 0.75 kW and it draws 7.0A — consistent with a 3/4 HP motor. The majority of US distributors rate it at 0.75 HP. The amperage (7.0A) is consistent across all sources and is the most reliable spec for matching. When replacing a 3/4 HP, 7.0-7.5A bath pump, the WBH100 is the correct replacement.

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🛠️ Installation Guide

Step-by-Step Installation:

1. Disconnect power — Unplug the old pump from the electrical outlet. Never work on plumbing with power connected.
2. Disconnect plumbing — Loosen the union fittings on both the suction and discharge connections. Have towels ready for residual water.
3. Remove old pump — Slide the old pump out of position.
4. Install new unions — If replacing unions, cut existing PVC pipe cleanly. The 1-1/2″ PVC schedule 40 pipe slides into the union — it is NOT threaded into the inlet/outlet.
5. Position new pump — Place the WBH100 in the same orientation as the old pump (suction on bottom, discharge in center).
6. Connect plumbing — Hand-tighten unions to suction and discharge ports. Do not over-tighten.
7. Connect air tubing — Attach 1/4″ air hose from the air button to the air switch nipple on the pump.
8. Plug in NEMA cord — Connect the 3-prong plug to a GFCI-protected outlet.
9. Test operation — Press the air button to activate the pump. Fill the tub with water BEFORE running the pump.

Installation Notes:

⚠️ Never run the pump dry — always ensure water is above the jet level before activating

⚠️ If the motor doesn’t start when plugged in, the air switch may be in the “off” position — press the air button to toggle

⚠️ Pump must be installed below water level (flooded suction) for proper operation

⚠️ Ensure proper grounding and GFCI protection per NEC requirements

⚠️ There is no industry standard for bath pump unions — the unions provided may require cutting off your old unions and installing the new ones

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🔧 Maintenance Guide

Routine Maintenance:

Task	Frequency	Notes
Check for leaks	Monthly	Around seal plate and union connections
Inspect unions	Monthly	Tighten if needed — do not over-tighten
Check motor vents	Quarterly	Keep clear of debris for proper air cooling
Inspect NEMA cord	Quarterly	Look for damage, cracking, or discoloration
Check amperage	Annually	Should read approximately 7.0A under load

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, or humming without rotation)
• Water leaking from the seal plate area
• Motor trips the circuit breaker repeatedly
• Reduced water flow or jet pressure
• Motor overheating or burning smell
• Pump fails to start when air button is pressed (and air switch is functional)

Seal Replacement:

📍 Seal Type: Dry run mechanical seal
⚠️ Shaft seal warranty: 3 months (part only)
⚠️ Replace seal at first sign of leakage from the seal plate area

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💨 Air Switch Operation

The WBH100 has a built-in pneumatic air switch — the same type used in the Vico WOW and Waterway Genesis pumps.

How it works:

1. An air button (sold separately) is mounted on the bathtub surface — typically on the rim or deck
2. 1/4″ air tubing (sold separately) connects the air button to the air switch nipple on the pump
3. Pressing the air button sends a puff of air through the tubing to the switch
4. The switch toggles the pump on or off — press once to start, press again to stop

What you need (sold separately):

• Air button (standard 1-3/4″ diameter, requires 1-3/8″ hole in tub deck)
• 1/4″ air tubing (available in 10-foot lengths or full rolls)

💡 Tip: If the pump doesn’t start when first plugged in, the air switch may be in the “off” position from the factory. Press the air button once to activate.

🎯 Ideal Applications

Application	Suitability	Notes
♨️ Whirlpool / jetted bathtub	✅ Yes	Primary intended use
🛁 Jetted garden tub	✅ Yes	Standard residential installation
♨️ Hot tub / spa jet pump	❌ No	Not designed for continuous hot tub use
♨️ Spa circulation pump	❌ No	This is a jet pump, not a circ pump

🔄 LX WBH/WCH Bath Pump Family

Model (with cord / no cord)	HP	Amps	Input Power	Replaces
WBH75 / WCH75	0.75 HP	5.0A	0.55 kW	WOW 1050031 (0.5 HP, 5.5A)
WBH100 / WCH100 (this pump)	0.75 HP	7.0A	0.75 kW	WOW 1050032 (3/4 HP, 7.5A)
WBH150 / WCH150	1.5 HP	9.0A	1.1 kW	WOW 1051057 (1.0 HP, 9.0A)
WBH200	2.0 HP	—	—	Higher-power bath applications

All WBH models include NEMA cord + unions. All WCH models include unions but NO cord. All models share 1-1/2″ MBT connections, built-in air switch, self-draining design, UL/CSA certification, and 1-year warranty.

💡 Naming convention: W = Whirlpool, B = with cord, C = without cord, H = front/top discharge. Note that LX’s model numbers (75, 100, 150) reflect their internal HP designation, which may differ from how US distributors rate the pump — always match by amperage.

❓ Frequently Asked Questions

Q: What horsepower is this pump? A: The WBH100 is rated at 0.75 HP (3/4 HP) with an input power of 0.75 kW and draws 7.0A. Note that LX’s own model numbering convention (WBH”100″) suggests 1.0 HP, but the majority of US distributors rate it at 0.75 HP. The amperage (7.0A) is consistent across all sources and is the most reliable matching spec.

Q: Will the LX WBH100 replace my Balboa Vico WOW 1050032? A: Yes — the WBH100 is widely used as a direct replacement for the Vico WOW 1050032. Both use 1-1/2″ MBT connections with the same center discharge / bottom suction configuration. Dimensions are very similar (within 1/2″ on all axes). The WBH100 draws 7.0A compared to the WOW’s 7.5A — it will work on the same circuit.

Q: Will this replace my Waterway Genesis 321HF10-0150? A: Yes — the WBH100 is commonly used to replace the Waterway Genesis. Both use the same 1-1/2″ MBT connection style. Dimensions differ slightly (Genesis is 12-1/2″ L vs WBH100’s 13-3/16″ L) — verify physical clearance in your installation space.

Q: Does this pump include a power cord? A: The WBH100 includes a 3-foot NEMA cord with plug. The WCH100 model does NOT include a cord — you must reuse the cord from your old pump. Make sure you’re ordering the correct model.

Q: Does this pump include unions? A: Yes — both the WBH100 and WCH100 include two 1-1/2″ unions with o-rings. Note that bath pump union designs vary by manufacturer — the included unions may require cutting off your old unions and installing the new ones with PVC cement.

Q: Do I need an air button? A: Yes — the pump has a built-in air switch but does not include an air button or air hose. You need a separate air button (mounted on the tub deck) and 1/4″ air tubing to connect it. Standard air button hole size is 1-3/8″ for a 1-3/4″ diameter button.

Q: What voltage does this pump require? A: 115V / 60Hz. This is standard US household voltage (110-120V). Plugs into a standard GFCI-protected outlet. Do not use on 230V circuits.

Q: Is this pump UL listed? A: Yes — the WBH100 is UL Recognized and CSA Certified with IPX4 protection rating and Class B insulation.

Q: What is the difference between WBH and WCH models? A: WBH = with 3′ NEMA power cord. WCH = without cord (you must reuse your old cord). All other specifications are identical.

Q: How do I know if my pump needs replacing? A: Signs include unusual noise (grinding, screeching), water leaking from the seal area, reduced jet pressure, motor tripping the breaker, or failure to start.

Q: Do I need a GFCI breaker? A: Yes — GFCI protection is required by the National Electrical Code (NEC) for all whirlpool bath and spa installations.

🏆 Why Choose the LX WBH100

• ✅ Complete Package — Cord, unions, and air switch all included — no separate purchases needed
• ✅ Cost-Effective Replacement — Significantly less expensive than Waterway Genesis and Balboa WOW pumps with comparable performance
• ✅ Proven Compatibility — Direct drop-in replacement for WOW 1050032 and Genesis 321HF10 series
• ✅ Quality Construction — Glass reinforced composite housing, dry run mechanical seal, pure copper winding motor
• ✅ UL & CSA Certified — Meets North American safety standards with IPX4 protection
• ✅ 1-Year Manufacturer Warranty — Backed by Guangdong Lingxiao, one of the world’s largest bath pump manufacturers

🤝 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 in USD
• ✅ Full warranty support
• ✅ Hassle-free returns
• ✅ Air buttons, air tubing, and compatible accessories available
• ✅ Dedicated customer service team

✨ Summary

The LX Lingxiao WBH100 is a 0.75 HP, 115V, 7.0A single-speed whirlpool bath pump that provides a complete, cost-effective replacement for Balboa Vico WOW 1050032 and Waterway Genesis 321HF10 bath pumps. The package includes a 3-foot NEMA cord, two 1-1/2″ unions with o-rings, and a built-in air switch — everything needed for a straightforward installation. UL Recognized and CSA Certified with glass reinforced composite housing and a dry run mechanical seal. Order 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: 509 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: 659 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: 144 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: 414 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: 163 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.