🛁 LX Lingxiao WCH75 Bath Pump – 0.75 HP Single-Speed Whirlpool Bath Pump

Compact, reliable jet power for whirlpool bathtubs with energy-efficient 5-amp operation

📋 Product Overview

The LX Lingxiao WCH75 is a compact single-speed whirlpool bath pump delivering 0.75 HP of jet-driving force at just 5.0 amps on 115V power. Designed for the North American market, this energy-efficient bath pump is ideal for smaller whirlpool bathtubs with 2-6 jets, offering reliable performance while drawing minimal current on a standard 15A household circuit.

The WCH75 features a front/top wet end configuration with bottom suction and center discharge using industry-standard 1-1/2″ male buttress thread (MBT) connections. It includes a built-in air switch for convenient tub-side on/off control and comes with two 1-1/2″ unions for a complete plumbing connection. This pump is one of the most popular replacements for the Waterway Genesis, Balboa Vico WOW, and American Standard whirlpool bath pump lines.

Built with LX’s air-cooled pure copper motor, thermal protection, glass reinforced composite housing, and dry run mechanical seal, the WCH75 offers professional-grade reliability in a compact package. UL recognized and CSA certified for North American safety compliance.

✨ Key Features

✅ 0.75 HP Motor (5.0A) – Energy-efficient operation on a standard 15A household circuit with plenty of jet power for smaller whirlpool baths

✅ 115V / 60Hz Operation – Standard North American voltage, plugs into existing circuits

✅ Built-In Air Switch – Integrated pneumatic on/off switch for convenient tub-side control

✅ Two 1-1/2″ Unions Included – Complete plumbing connection kit with o-rings

✅ 1-1/2″ MBT Connections – Male buttress thread suction and discharge ports for industry-standard compatibility

✅ Front/Top Wet End Configuration – Bottom suction, center discharge matches most whirlpool bath installations

✅ Thermal Protected Motor – Texas Instruments thermal protector prevents motor damage from overheating

✅ Pure Copper Motor Windings – Air-cooled motor with anti-creep bearings for quiet, long-lasting operation

✅ Glass Reinforced Composite Housing – Durable, corrosion-resistant pump body

✅ Dry Run Mechanical Seal – Reliable sealing even during brief dry conditions

✅ Self-Draining Volute – Promotes hygienic operation by preventing stagnant water buildup

✅ UL Recognized and CSA Certified – Dual safety certification for North American residential installations

🔩 Technical specifications

📐 Dimensions

Measurement	Value
Length	12-7/16 inches
Width	5-1/4 inches
Height (Overall)	6-15/16 inches

💡 The WCH75 is the most compact pump in the LX WCH/WBH bath pump family, making it ideal for tight enclosure spaces under whirlpool bathtubs.

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🔧 Parts and fittings for this

🔌 Electrical Requirements

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

💡 At only 5.0 amps, the WCH75 operates well within the NEC 80% continuous load rule for a standard 15A circuit (12A maximum continuous), leaving ample headroom for safe operation.

🔗 Compatibility Guide

This Pump:

📍 Frame: 48 Frame Thru-Bolt 📍 Wet End: Front/Top 📍 Suction: 1-1/2″ MBT — Bottom 📍 Discharge: 1-1/2″ MBT — Center 📍 Unions: Two 1-1/2″ included

Replaces:

The LX WCH75 is a direct replacement for the following pumps:

Original Pump	Part Number	Notes
American Standard	753746-402	Direct replacement
American Standard	955523	Direct replacement
Balboa Vico WOW	10-1010031	Match amperage, not HP
Waterway Genesis	PX10000SCB	Direct replacement
Waterway Genesis	WPP600A	Direct replacement
OEM	WW050	Per LX compatibility list
OEM	3312620-14	Per LX compatibility list
OEM	04207001-5010	Per LX compatibility list
OEM	754825-301	Per LX compatibility list

Cross-Reference Part Numbers: 34-343-1000, 390587, WCH75

WCH75 vs. WBH75: Both are the same pump (5.0A, 0.75 HP, identical dimensions and connections). The traditional difference is: WBH = includes NEMA power cord; WCH = cord may or may not be included (varies by production batch). Verify cord inclusion with Parts4Tubs. Both include unions and air switch.

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🛠️ Installation Requirements

Mounting:

Requirement	Specification
Mounting Position	Horizontal
Base	Solid, level surface
Vibration Dampening	Rubber mounting pads recommended
Ventilation	Ensure adequate airflow around motor for air cooling
Access	Allow clearance for maintenance and union access

Plumbing:

Connection	Size
Suction	1-1/2″ MBT (bottom)
Discharge	1-1/2″ MBT (center)
Unions	Included — two 1-1/2″ unions with o-rings

Installation Notes:

⚠️ Pump must be installed below water level (flooded suction) for proper operation ⚠️ Never run pump dry — causes seal and motor damage ⚠️ Ensure proper grounding and bonding per NEC requirements ⚠️ GFCI protection is required by code ⚠️ This pump is equipped with an air switch — if the motor does not start when powered, the air switch may be in the OFF position. Press the air button to activate ⚠️ Air button and air tubing are sold separately (tubing: part 63000) ⚠️ If your pump arrived without a cord, you may reuse the cord from your old pump or purchase a compatible NEMA cord separately

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🔧 Maintenance Guide

Routine Maintenance:

Task	Frequency	Notes
Check for leaks	Monthly	Around seal plate and union connections
Inspect unions and o-rings	Monthly	Tighten if needed, replace o-rings if worn
Check air switch function	Monthly	Ensure reliable on/off operation
Inspect motor vents	Quarterly	Keep clear of debris for proper air cooling
Check mounting stability	Quarterly	Ensure pump is secure on mounting surface
Verify amperage	Annually	Should read approximately 5.0A

Seal Replacement:

📍 Seal Type: Dry run mechanical seal ⚠️ Replace seal at first sign of leakage from the seal plate area

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, or humming without starting)
• Water leaking from seal area
• Motor trips breaker repeatedly
• Reduced water flow or weak jet pressure
• Motor overheating or burning smell
• Air switch no longer activates motor

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🎛️ LX WCH / WBH Family Comparison

The WCH75 is the entry-level pump in the LX bath pump family. All models share the same front/top wet end configuration with 1-1/2″ MBT connections:

Model	HP (LX)	Amperage	Dimensions (L × W × H)	Cord
WCH75	0.75 HP	5.0A	12-7/16″ × 5-1/4″ × 6-15/16″	Verify
WCH100	1.0 HP	7.0A	13-3/16″ × 5-1/4″ × 6-15/16″	No
WCH150	1.5 HP	9.0A	14-3/16″ × 5-1/4″ × 6-15/16″	No
WBH75	0.75 HP	5.0A	12-7/16″ × 5-1/4″ × 6-15/16″	Yes (3 ft NEMA)
WBH100	1.0 HP	7.0A	13-3/16″ × 5-1/4″ × 6-15/16″	Yes (3 ft NEMA)
WBH150	1.5 HP	9.0A	14-3/16″ × 5-1/4″ × 6-15/16″	Yes (3 ft NEMA)
WBH200	2.0 HP	13.0A	13-7/8″ × 6-1/8″ × 8-5/16″	Verify

⚠️ Always match by amperage when selecting a replacement — not HP rating, which varies by source.

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🛁 Ideal Applications

Application	Suitability	Notes
🛁 Small whirlpool bathtub (2-4 jets)	✅ Ideal	Perfect match for compact tubs with few jets
🛁 Medium whirlpool bathtub (4-6 jets)	✅ Yes	Adequate jet pressure for standard installations
🛁 Large whirlpool bathtub (8+ jets)	❌ No	Consider WCH150 or WBH200 for more jets
🛁 Replacement for 5.0A bath pump	✅ Yes	Direct match for all 5-amp bath pumps listed above
♨️ Hot tub jet pump	❌ No	Designed for bath applications, not hot tub spa use
🛁 Massage armchair pump	✅ Yes	Suitable for 2-4 nozzle massage systems per LX

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❓ Frequently Asked Questions

Q: What horsepower is this pump? A: LX officially rates the WCH75 at 0.75 HP (3/4 HP) with 0.55 kW input power. Some US distributors list it as 0.5 HP (1/2 HP). Both refer to the same pump. The 5.0A draw at 115V is the most reliable specification for matching replacements.

Q: What is the difference between the WCH75 and WBH75? A: Both are the same pump with identical specs (5.0A, 0.75 HP, same dimensions, same connections). The traditional difference is the WBH series includes a 3-foot NEMA power cord, while the WCH series may or may not include one. Both include unions and a built-in air switch. Verify cord inclusion with Parts4Tubs.

Q: Does this pump include unions? A: Yes, two 1-1/2″ unions with o-rings are included.

Q: Does this pump include a power cord? A: Cord inclusion may vary by production batch. The WCH series has traditionally shipped without a cord, but LX’s latest production may include one. Please verify with Parts4Tubs before ordering. If no cord is included, you can reuse the cord from your old pump.

Q: Will this fit my American Standard whirlpool tub? A: The WCH75 is a direct replacement for American Standard pump part numbers 753746-402 and 955523. Match your existing pump’s amperage (5.0A) and port size (1-1/2″) to confirm compatibility.

Q: Can I run this on a standard household outlet? A: At 5.0 amps on 115V, the WCH75 operates safely on a standard 15A household circuit. However, GFCI protection and a dedicated circuit are required by the National Electrical Code (NEC) for all whirlpool bath installations. All electrical work must be performed by a licensed electrician.

Q: What voltage does this pump require? A: 115V / 60Hz. Using the wrong voltage will damage the motor.

Q: Does this pump come with an air switch? A: Yes, the air switch is built into the pump. You will need to purchase the air button and air tubing separately (tubing: part 63000). The air button mounts on the tub surface for on/off control.

Q: Is this a single speed or dual speed pump? A: Single speed. The WCH75 runs at one speed only.

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

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

⭐ Why Choose the LX WCH75

✅ Energy Efficient – Only 5.0A draw operates comfortably on a standard 15A circuit

✅ Most Compact Size – Smallest pump in the LX bath pump family at 12-7/16″ length, ideal for tight enclosure spaces

✅ Unions Included – Two 1-1/2″ unions with o-rings for complete plumbing connection

✅ Wide Replacement Compatibility – Replaces American Standard, Waterway Genesis, Balboa Vico WOW, and more

✅ Pure Copper Motor – Air-cooled copper winding motor with anti-creep bearings for reliable, quiet operation

✅ Built-In Air Switch – Convenient pneumatic control included

✅ Dual Safety Certified – UL recognized and CSA certified for North American installations

✅ 1 Year Manufacturer Warranty – Factory-backed warranty coverage

🤝 Why Buy from Parts4Tubs

✅ Fast shipping across the United States

✅ Expert advice from spa and hot tub specialists

✅ Competitive pricing

✅ Full warranty support

✅ Hassle-free returns

✅ Air tubing, buttons, and accessories available

✅ Dedicated customer service team

💧 Summary

The LX Lingxiao WCH75 is a compact, energy-efficient whirlpool bath pump delivering 0.75 HP at just 5.0 amps on 115V. Featuring a built-in air switch, included 1-1/2″ unions, bottom suction with center discharge, and a self-draining glass reinforced composite housing, it is a popular replacement for American Standard, Waterway Genesis, and Balboa Vico WOW bath pumps. UL and CSA certified with a 1-year warranty. Order today from Parts4Tubs for fast US shipping.

Unions and pump cords: pick the union size that matches your pump's ports (see the size chart below), and a 4-wire cord for a 2-speed pump.

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
• Screwdriver
• New union O-rings
• A strap wrench, only if a union nut is stuck
• PVC primer and cement, only if you are gluing in new tailpieces

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. Unscrew the union nuts by hand. If one is stuck, use a strap wrench rather than a pipe wrench, which can crack the nut. 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. Pump unions use buttress threads that seal on an O-ring, so fit new O-rings and hand-tighten the nuts. Do not use thread tape, pipe dope or sealant on them.

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, hand-tightening the union nuts. If you are gluing in new PVC tailpieces, use PVC primer and cement on those joints.

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.