🔄 LX WTC150 Spa Pump – 1.5HP Single Speed Circulation Pump

Compact, Reliable Circulation Power with Self-Draining Design

💧 Product Overview

The LX WTC150 is a compact single-speed 1.5HP circulation pump designed specifically for hot tubs and spas requiring reliable water movement for heating and filtration. Unlike larger jet pumps, the WTC150 is engineered for continuous circulation duties, keeping your spa water warm, clean, and properly filtered around the clock.

With a modest 1.1kW motor drawing just 6.1A, the WTC150 offers efficient operation without excessive energy consumption. The thoughtfully designed centre suction configuration with self-draining capability makes maintenance simpler and helps protect the pump during winterisation or servicing. A thermally protected motor provides additional peace of mind, automatically protecting against overheating during extended operation.

Featuring compact dimensions of just 290mm × 160mm × 200mm and 1.5-inch plumbing connections, the WTC150 fits easily into tight equipment bays. Commonly found in Chinese-manufactured spas including Blue Whale hot tubs, this pump has earned a reputation for dependable circulation performance in residential spa applications.

✨ Key Features

✅ 1.5HP Single-Speed Motor – 1.1kW output delivers consistent circulation power for heating and filtration

✅ Centre Suction Design – Optimised inlet positioning for efficient water intake

✅ Self-Draining Capability – Simplified maintenance and winterisation protection

✅ Thermally Protected Motor – Built-in overheating protection for safe continuous operation

✅ Compact Dimensions – 290mm × 160mm × 200mm fits tight equipment spaces

✅ 1.5″ Plumbing Connections – Standard suction and discharge ports for easy installation

✅ Energy Efficient – Just 6.1A draw for economical continuous operation

✅ 7µF Capacitor – Properly sized for reliable motor starting

✅ Proven Reliability – Widely used in Chinese-manufactured spas including Blue Whale

✅ Simple Single-Speed Operation – Dedicated circulation without complex controls

⚙️ Technical Specifications

Motor Specifications

Specification	Value
Power Reference	1.5 HP
Motor Output	1.1 kW
Speed Type	Single Speed (1 Speed)
Amperage	6.1 A
Capacitor	7 µF

Physical Dimensions

Specification	Value
Length	290 mm
Width	160 mm
Height	200 mm
Plumbing Size	1.5″

Design Features

Feature	Specification
Suction Configuration	Centre suction
Drainage	Self-draining design
Motor Protection	Thermally protected
Pump Type	Circulation Pump

Connection Specifications

Specification	Value
Suction Port	1.5 inch
Discharge Port	1.5 inch

🔌 Electrical Requirements

Electrical Specification	Requirement
Amperage	6.1 A
Capacitor Rating	7 µF
Motor Protection	Thermally protected

⚠️ IMPORTANT ELECTRICAL SAFETY NOTICE:

All electrical work must be carried out by a qualified electrician in accordance with UK wiring regulations (BS 7671). Hot tub installations require RCD protection (30mA) for safety. Never attempt electrical connections yourself unless you are appropriately qualified.

💡 Tip: The relatively low 6.1A draw makes the WTC150 suitable for connection to most spa control systems without requiring a separate dedicated circuit, though always verify your system’s capacity.

🔗 Compatibility Guide

Plumbing Configuration

Component	Specification
Suction Port	1.5″
Discharge Port	1.5″
Suction Design	Centre suction

Compatible Hot Tub Brands

The LX WTC150 is commonly found in and compatible with:

• ♨️ Chinese-manufactured hot tubs and spas
• ♨️ Blue Whale Spas

🛠️ Installation Requirements

Mounting Specifications

Requirement	Specification
Dimensions (L × W × H)	290mm × 160mm × 200mm
Base Surface	Solid, level, vibration-dampening
Ventilation	Ensure adequate clearance for motor cooling

Plumbing Connections

Connection	Size
Suction	1.5″
Discharge	1.5″

Installation Notes

⚠️ Pump must be installed below water level (flooded suction) – This ensures proper priming and prevents air lock issues.

⚠️ Never run the pump dry – Dry running causes immediate seal damage. The thermal protection will help, but prevention is essential.

⚠️ Ensure proper electrical bonding to earth – All metal components must be correctly earthed as per BS 7671 requirements.

⚠️ Centre suction orientation – Ensure the pump is positioned to allow proper water intake through the centre suction port.

💡 Self-Draining Benefit: The self-draining design allows water to evacuate from the pump body when the system is shut down, making winterisation and maintenance easier.

🔧 Maintenance Guide

Routine Maintenance Schedule

Task	Frequency	Notes
Check for water leaks	Monthly	Inspect around seal area and connections
Inspect plumbing connections	Monthly	Tighten if any looseness detected
Check motor vents	Quarterly	Ensure vents are clear of debris for proper cooling
Inspect mounting	Quarterly	Tighten bolts if loose to reduce vibration
Listen for unusual sounds	Monthly	Early detection of bearing or impeller issues
Check amperage draw	Annually	Should read approximately 6.1A under load
Verify thermal protection	Annually	Ensure motor shuts down if overheating occurs

Warning Signs – When to Replace

Consider replacing your pump if you notice:

• 🔊 Unusual noises such as grinding, screeching, or humming
• 💧 Water leaking from the mechanical seal area
• ⚡ Motor repeatedly tripping the circuit breaker
• 💨 Significantly reduced water flow
• 🌡️ Motor housing becoming excessively hot despite thermal protection
• ⏱️ Pump struggling to start or humming without turning
• ❄️ Failure of self-draining function (water remaining trapped)

🎯 Ideal Applications

Application	Suitability	Notes
♨️ Spa Circulation/Filtration	✅ Excellent	Primary design purpose
♨️ Heating Circuit Pump	✅ Excellent	Continuous water movement for heater
♨️ Small Hot Tub Jets	✅ Good	1.5HP provides moderate jet power
♨️ Whirlpool Bath	✅ Good	Suitable for smaller systems
♨️ Large Multi-Jet System	⚠️ Limited	Consider larger WP series for demanding jets

❓ Frequently Asked Questions

Q: What horsepower is this pump?

A: The WTC150 is rated at 1.5HP with a 1.1kW motor output.

Q: Is this a circulation pump or a jet pump?

A: The WTC150 is designed as a circulation pump for continuous water movement, heating, and filtration duties. While it can power smaller jets, dedicated jet pumps like the WP series are better suited for high-powered hydrotherapy jets.

Q: What size are the plumbing connections?

A: Both suction and discharge ports are 1.5-inch connections.

Q: What is the amperage draw?

A: The pump draws 6.1A during operation.

Q: What does “centre suction” mean?

A: Centre suction means the water intake port is positioned in the centre of the wet end, rather than offset to one side. This is a common configuration for circulation pumps.

Q: What is the self-draining feature?

A: The self-draining design allows water to naturally evacuate from the pump body when the system is shut down, reducing the risk of freeze damage and simplifying winterisation procedures.

Q: What does “thermally protected” mean?

A: The motor includes built-in thermal protection that automatically shuts the motor down if it begins to overheat, protecting against damage from blockages, dry running, or prolonged high-temperature operation.

Q: What capacitor does this pump use?

A: The pump uses a 7µF capacitor.

Q: Which hot tub brands use this pump?

A: The WTC150 is commonly found in Chinese-manufactured spas, including Blue Whale hot tubs.

Q: How do I know if my pump needs replacing?

A: Common signs include unusual grinding or screeching noises, water leaking from the seal area, reduced water flow, the motor tripping the breaker, or the pump struggling to start.

---

🏆 Why Choose the LX WTC150

✅ Purpose-Built Circulation – Designed specifically for continuous heating and filtration duties

✅ Self-Draining Design – Simplified maintenance and winterisation protection

✅ Thermally Protected Motor – Built-in overheating protection for peace of mind

✅ Compact Form Factor – 290mm × 160mm × 200mm fits even tight equipment bays

✅ Energy Efficient – Just 6.1A draw for economical continuous operation

✅ Proven Compatibility – Widely used in Chinese spas including Blue Whale

✅ Centre Suction Design – Efficient water intake configuration

🤝 Why Buy from Parts4Tubs

✅ UK-Based Company – Local support from spa parts specialists who understand your needs

✅ Fast UK Delivery – Quick dispatch to get your hot tub back up and running promptly

✅ Expert Technical Advice – Knowledgeable team available to help with compatibility questions and installation guidance

✅ Competitive Pricing – Great value on genuine quality parts without compromising on reliability

✅ Full Warranty Support – Peace of mind with comprehensive warranty coverage

✅ Easy Returns – Hassle-free returns within 30 days if you’re not completely satisfied

✅ Replacement Parts Available – Seal kits, capacitors, and other spares in stock

✅ Real People, Real Help – Buy from a person, not just the internet. We’re here to help with your spa parts needs

💦 Summary

The LX WTC150 is a compact 1.5HP single-speed circulation pump designed for reliable heating and filtration duties in hot tubs and spas. With its efficient 1.1kW motor drawing just 6.1A, centre suction design, self-draining capability, and thermally protected motor, the WTC150 delivers dependable continuous operation with built-in safety features. Featuring compact 290mm × 160mm × 200mm dimensions and standard 1.5-inch plumbing connections, this pump fits easily into most equipment configurations. Commonly found in Chinese-manufactured spas including Blue Whale hot tubs, the WTC150 is an excellent choice for spa owners seeking reliable, efficient circulation performance.

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	1.5 inch Union O-Ring	£1.55 Max: 54 Min: 1 Step: 1 Add to cart
	2 inch Union O-Ring	£1.55 Max: 100 Min: 1 Step: 1 Add to cart
	2 to 1.5 inch Threaded Union Adapter	£7.27 Max: 52 Min: 1 Step: 1 Add to cart
	2.5 inch Union O-Ring	£1.55 Max: 100 Min: 1 Step: 1 Add to cart
	2.5 inch Waterway Union with 2 inch Tailpiece	£9.69 Max: 34 Min: 1 Step: 1 Add to cart
	4 pin Amp cord (Dual Speed Pump)	£18.06 Max: 6 Min: 1 Step: 1 Add to cart

The hot tub industry doesnt make it easy for you when you are trying to match up the size of the unions (the part that screws your pipe work onto the pumps) Below you can see the physical sizes of the collars, and how they relate to the actual union size you need. So a measurement of 2.5", edge to edge on the collar of the pump is actually a 1.5" union - confusing - absolutely! If you are not sure, give me a shout!

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.