💦 LX LP300 Spa Pump – 3.0 HP Single Speed Jet Pump

The flagship powerhouse for ultimate hydrotherapy performance

♨️ Product Overview

The LX LP300 is the most powerful pump in the acclaimed LP series, delivering an exceptional 3.0 HP (2.2 kW) of raw power for hot tubs and swim spas that demand uncompromising jet performance. With an industry-leading maximum flow rate of 635 litres per minute and 17 metres of head pressure, this flagship single-speed pump is engineered for the largest spa installations and most demanding multi-zone hydrotherapy systems.

As the ultimate booster pump in the LP range, the LP300 drives high-volume water through multiple jet arrays simultaneously, creating the intense massage experience that premium spa owners expect. The centre suction with side discharge configuration provides installation versatility, whilst the thermally protected motor ensures safe, reliable operation even under sustained heavy use in commercial environments.

The LP series has earned its reputation as the preferred replacement for discontinued Theramax pumps in Jacuzzi and Sundance spas worldwide. The LP300 offers a cost-effective alternative to premium American pumps including Waterway Executive, Koller, and Aqua-Flo models, delivering equivalent performance at outstanding value. With upgraded ceramic/Viton shaft seals, robust finned motor construction, and proven reliability across thousands of installations, the LP300 represents the pinnacle of single-speed spa pump engineering.

This pump is specifically designed for post-2008 spa systems and is the definitive choice for large hot tubs, swim spas, and commercial installations where maximum jet power is non-negotiable.

✨ Key Features

• ✅ 3.0 HP Motor Power – 2.2 kW flagship output for ultimate jet performance in large spas
• ✅ Maximum Flow Rate – Industry-leading 635 L/min for intense multi-zone hydrotherapy
• ✅ Superior Head Pressure – 17 metres maximum head for demanding plumbing configurations
• ✅ Single Speed Operation – Reliable 2900 RPM motor for consistent high-power performance
• ✅ 48 Frame Motor – European-style finned body design for efficient heat dissipation
• ✅ 2″ Plumbing Connections – 79mm centre suction × 79mm side discharge with buttress thread unions
• ✅ Thermally Protected Motor – Built-in thermal protection prevents overheating damage
• ✅ Upgraded Shaft Seal – Ceramic/Viton Type A mechanical seal for superior longevity
• ✅ Pre-Wired with AMP Plug – Factory-fitted 3-core AMP cable for straightforward installation
• ✅ Rotatable Wet End – 4-bolt wet end repositions to match any plumbing configuration
• ✅ TÜV & CE Certified – European safety certification for peace of mind
• ✅ 1 Year Manufacturer Warranty – Standard warranty with extended options available

🔧 Technical Specifications

Specification	Value
Pump Type	Single Speed Jet Pump / Booster Pump
Motor Power	3.0 HP / 2.2 kW
Speed Settings	Single Speed
Flow Rate (Max)	635 L/min
Maximum Head	17 m
Voltage	220-240 V
Frequency	50 Hz
Amperage	13.0 A
Motor Speed	2900 RPM
Frame Type	48F (European Finned Body)
Wet End	2 inch
Discharge Port	79 mm (2 inch) – Side
Suction Port	79 mm (2 inch) – Centre
Union Thread	78 mm outer thread / 60 mm internal (Male Buttress)
Port Position	Centre suction / Side discharge
Seal Type	Type A Mechanical Shaft Seal (Ceramic/Viton)
Capacitor	50 µF
Impeller Part No.	B351-04
Impeller Diameter	116 mm
Impeller Vane Gap	12.5 mm
Dimensions (L×W×H)	400 × 200 × 220 mm
Plug Type	3-Core AMP
Certifications	TÜV, CE
Warranty	1 year manufacturer

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	220-240 V
Frequency	50 Hz
Phase	Single Phase
Full Load Amps	13.0 A
Capacitor	50 µF
Thermal Protection	Built-in thermal protector
Cable Supplied	3-Core with AMP plug

⚠️ IMPORTANT:

All electrical work must be carried out by a qualified electrician in accordance with UK wiring regulations (BS 7671). Hot tubs require RCD protection (30mA). Due to the higher amperage draw of this pump (13A), ensure the circuit breaker and cabling are appropriately rated. The pump must be properly earthed before operation.

🔄 Compatibility Guide

Frame & Connection Dimensions:

Component	Specification
Frame Type	48F (European Finned Body)
Wet End Size	2 inch
Union Thread	78 mm outer / 60 mm internal (Male Buttress)
Suction Port	79 mm centre
Discharge Port	79 mm side

This Pump Configuration:

• 📍 Frame: 48F European-style finned body motor
• 📍 Wet End: 2 inch with rotatable positioning (4-bolt)
• 📍 Discharge: 79 mm (2″) side discharge
• 📍 Suction: 79 mm (2″) centre suction
• 📍 Impeller: 116 mm diameter (B351-04)

Direct Replacement For:

• Jacuzzi Theramax pumps (discontinued)
• Sundance Theramax pumps (discontinued)
• Aqua-Flo XP2e 3.0 HP
• Waterway Executive 3.0 HP
• Koller 3 HP
• RWA 3HP Single Speed

OEM Part Numbers:

Brand	Part Number
LX	LP300
Watkins/HotSpring/Caldera	0977601-03
Wellis	ACM0080
Volition	30LP or PL300
Jazzi	JAPU3

⚠️ IMPORTANT NOTE – Pre-2008 Pumps:

Older (pre-2008) LP & WP pumps and wet ends are manufactured with a shorter section (approx. 15mm) and discharge port (approx. 30mm). If replacing a pre-2008 version (wet end labelled B351-03) on a spa with rigid plumbing, the newer version may not align with existing pipework. In these cases, the Waterway Executive equivalent may provide a better fit.

🛠️ Installation Requirements

Mounting:

Requirement	Specification
Mounting Position	Horizontal (standard)
Base	Solid, level, vibration-dampening surface
Ventilation	Adequate clearance around finned motor body for cooling
Access	Allow space for maintenance and seal replacement

Plumbing:

Connection	Size
Suction	79 mm (2 inch) centre
Discharge	79 mm (2 inch) side
Union Type	2.0 inch buttress thread (78mm outer)
Union Internal Diameter	60 mm

Installation Notes:

• ⚠️ Pump must be installed below water level (flooded suction) for proper priming
• ⚠️ Never run pump dry – causes immediate seal damage and motor overheating
• ⚠️ Ensure proper bonding to earth in accordance with BS 7671
• ⚠️ Due to higher power draw, verify electrical supply is adequate (13A minimum circuit)
• ⚠️ The wet end can be rotated by removing the 4 motor screws to suit your plumbing layout (left, right, top-left, or top-right discharge positions)
• ⚠️ Check discharge port alignment with existing plumbing before installation
• 💡 Use new unions and O-rings when replacing an existing pump
• 💡 The existing cable from your old pump can often be reused if in good condition
• 💡 Pump unions and O-rings included – for 2-inch pipes (60mm internal diameter)
• 💡 Completely interchangeable with certain Waterway and Aqua-Flo pumps

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⚙️ Maintenance Guide

Routine Maintenance:

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around seal and union connections
Inspect unions	Monthly	Tighten if needed, replace O-rings if damaged
Clean strainer/filter	As needed	Remove debris to maintain flow
Check amperage	Annually	Should match 13.0 A rating
Inspect motor vents	Quarterly	Keep finned body clear of debris for cooling
Check mounting bolts	Quarterly	Tighten if loose to reduce vibration
Listen for unusual noise	Each use	Early detection prevents major failures

Warning Signs – Replace Pump If:

• Unusual noise (grinding, screeching, or humming without rotation)
• Water leaking from mechanical seal area
• Motor trips circuit breaker repeatedly
• Noticeably reduced water flow or jet pressure
• Motor overheating or burning smell
• Visible corrosion on motor housing

Seal Replacement:

• 📍 Seal Type: Type A Mechanical Shaft Seal (Ceramic/Viton upgrade)
• ⚠️ Replace seal at first sign of leakage – running a leaking pump damages bearings

Spare Parts Available:

• Mechanical seal (Type A)
• Motor bearings (6203Z & 6204Z set)
• Capacitor (50 µF)
• Impeller (B351-04, 116mm diameter)
• Complete wet end assembly (3.0HP)
• Motor cooling fan (124mm or 156mm)
• Fan cover
• Pump unions and O-rings (70mm for unions, 150mm for wet end face plate)
• Drain plugs
• Face plate screws (M5 x 15mm)

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Large hot tub jet pump	Excellent	The definitive choice for large spas with multiple jet zones
♨️ Spa booster pump	Excellent	Maximum flow for the most demanding multi-jet systems
💪 Swim spa jets	Excellent	Powers high-volume counter-current and jet systems
🛁 Commercial whirlpool	Excellent	Suitable for commercial and high-use installations

Additional Applications:

• Water circulation for large fish ponds (including salt water and seawater)
• Weak corrosive liquid circulation (without solid particles)
• Workshop fluid circulation and cooling systems

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❓ Frequently Asked Questions

Q: What horsepower is this pump?

A: The LX LP300 is rated at 3.0 HP (2.2 kW), the most powerful pump in the LP series. It delivers up to 635 litres per minute maximum flow rate and 17 metres maximum head pressure.

Q: Will this fit my hot tub?

A: This pump has a 48F frame with 2 inch wet end and 79mm centre suction / side discharge ports. It’s designed for post-2008 spa systems. Check your existing pump’s frame size and port configuration for compatibility. The LP300 is factory-fitted to numerous brands including Jacuzzi, Sundance, HotSpring, MAAX, Cascade, Wellis, and many Chinese-manufactured spas.

Q: What voltage does this pump require?

A: 220-240V / 50Hz single phase supply drawing 13 amps at full load. Due to the higher amperage, ensure your electrical circuit and cabling are appropriately rated. All electrical installation must be carried out by a qualified electrician in accordance with BS 7671.

Q: Is this a single or dual speed pump?

A: This is a single speed pump running at 2900 RPM. If you require a dual speed pump, consider the LX WP300-II which offers both high and low speed operation.

Q: What size are the ports?

A: Suction: 79mm (2 inch) centre. Discharge: 79mm (2 inch) side. Union connections use 78mm outer thread with 60mm internal diameter.

Q: Can this replace my Theramax pump?

A: Yes, the LP series is the recommended replacement for discontinued Theramax pumps used in Jacuzzi and Sundance spas, offering comparable performance at a more economical price.

Q: Can this replace an Aqua-Flo or Waterway Executive?

A: Yes, the LP300 is completely interchangeable with certain Waterway and Aqua-Flo pumps of similar specification, making it a cost-effective replacement option.

Q: What is the difference between the LP250 and LP300?

A: The LP300 delivers 3.0 HP (2.2 kW) compared to the LP250’s 2.5 HP (1.85 kW). The LP300 provides higher flow rate (635 L/min vs 600 L/min), greater head pressure (17m vs 15.5m), higher amperage draw (13A vs 8A), and uses a larger 50µF capacitor (vs 40µF). Choose the LP300 for the largest spas or most demanding jet systems.

Q: How does the LP300 compare to the entire LP series?

A: Here’s the complete LP series comparison:

Model	HP	kW	Flow	Head	Amps	Capacitor
LP150	1.5	1.1	520 L/min	14m	5.8A	20µF
LP200	2.0	1.5	535 L/min	13m	7.0A	30µF
LP250	2.5	1.85	600 L/min	15.5m	8.0A	40µF
LP300	3.0	2.2	635 L/min	17m	13.0A	50µF

Q: What warranty is included?

A: The manufacturer provides a 1 year standard warranty. Extended warranty options are available through Parts4Tubs.

Q: Can I rotate the wet end to match my plumbing?

A: Yes, the wet end is attached with 4 motor screws. Removing these allows you to rotate the wet end to suit your plumbing layout – options include standard (top), left, top-left, right, or top-right discharge positions.

Q: My spa was made before 2008 – will this fit?

A: Pre-2008 LP/WP pumps have slightly different dimensions (shorter section and discharge port). If your spa has rigid plumbing, the newer LP300 may not align perfectly. In these cases, a Waterway Executive equivalent may provide a better fit, or plumbing modifications may be required.

🏆 Why Choose the LX LP300

• ✅ Maximum Power – 3.0 HP flagship motor delivers unrivalled jet performance
• ✅ Industry-Leading Flow – 635 L/min for the most intense hydrotherapy experience
• ✅ Superior Head Pressure – 17m maximum head handles the most demanding installations
• ✅ Proven Reliability – The trusted choice across European and worldwide markets
• ✅ Cost-Effective Alternative – Economical replacement for Theramax, Aqua-Flo, Waterway, and Koller pumps
• ✅ Wide Compatibility – Direct fit for Jacuzzi, Sundance, HotSpring, Wellis, and many other brands
• ✅ European Certified – TÜV and CE certification for quality assurance
• ✅ Comprehensive Spares – All replacement parts readily available

🤝 Why Buy From Parts4Tubs

• ✅ UK-based company with local customer support
• ✅ Fast UK delivery options available
• ✅ Expert advice from experienced spa specialists
• ✅ Competitive pricing on genuine LX pumps
• ✅ Full manufacturer warranty support
• ✅ Easy returns within 30 days
• ✅ Replacement seals, impellers, bearings, and spare parts stocked
• ✅ Compatibility guidance for your specific hot tub model

⭐ Summary

The LX LP300 is the ultimate 3.0 HP single-speed jet pump, delivering an exceptional 635 L/min flow rate and 17 metres of head pressure for the most demanding hot tub and swim spa installations. As the flagship of the LP series, it’s the definitive choice for large spas, swim spas, and commercial systems where maximum hydrotherapy power is essential. A proven replacement for Jacuzzi and Sundance Theramax pumps, and a cost-effective alternative to Aqua-Flo, Waterway Executive, and Koller models, the LP300 offers professional-grade performance with European TÜV and CE certification. With upgraded ceramic/Viton seals, thermally protected motor, rotatable wet end, and compatibility with dozens of major spa brands, the LP300 delivers uncompromising power for owners who accept nothing less than the best. Backed by manufacturer warranty and comprehensive spare parts availability, this flagship pump ensures years of powerful, reliable hydrotherapy enjoyment.

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!

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.