💪 Sundance Jacuzzi TheraMax NB1 Spa Pump 6500-092 — 2.5 HP Dual-Speed 230V LX 48-Frame

NB1 Series LX-motor TheraMax replacement — powerful dual-speed jet performance for Sundance, Jacuzzi, and Gatsby spas

♨️ Product Overview

The Sundance/Jacuzzi TheraMax 6500-092 is the NB1 Series LX-motor variant of the factory OEM 2.5 HP dual-speed primary jet pump for Sundance, Jacuzzi, and Gatsby spa systems. Operating at 230V/60Hz with 11.0 Amps on high speed (3,450 RPM) and 3.3 Amps on low speed (1,725 RPM), this 48-frame baseless pump delivers both powerful hydrotherapy jet performance and quiet, energy-efficient filtration from a single unit. The “NB1” designation identifies the LX Lingxiao motor platform that replaced the earlier Emerson-motor TheraMax (6500-343) while maintaining identical wet end dimensions, port configurations, and mounting compatibility. The baseless design uses the separate 6000-532 bracket that wraps around the motor casing, and the rotatable wet end repositions in 90-degree increments to match any existing plumbing layout without modifications. As the primary 2-speed pump (pump #1) in Sundance spa systems, the 6500-092 provides high-speed jet power during bathing and low-speed circulation during filtration cycles. This pump is functionally interchangeable with the 6500-343 TheraMax and serves as a direct replacement for all earlier 2-speed TheraMax, TheraFlo, and Aqua-Flo XP pump generations dating back to 1994.

✨ Key Features

✅ NB1 Series LX Motor Platform — Updated LX Lingxiao motor variant of the proven TheraMax design, maintaining full compatibility with all Sundance/Jacuzzi 48-frame equipment bays

✅ 2.5 HP Dual-Speed Motor — 2.5 HP continuous duty rated with high speed at 3,450 RPM and low speed at 1,725 RPM for optimal jet and filtration performance

✅ 11.0 / 3.3 Amp Draw — High speed draws 11.0 Amps for full jet power; low speed at just 3.3 Amps for energy-efficient filtration and circulation

✅ 230V / 60Hz Operation — North American electrical standard with efficient dual-speed amperage draw

✅ 48-Frame (NB1) Thru-Bolt Construction — Industry-standard 48-frame thru-bolt motor for direct compatibility with Sundance and Jacuzzi equipment bays

✅ Baseless / Bracketless Motor — No integrated feet; uses the separate 6000-532 mounting bracket that wraps around the motor body for maximum installation flexibility

✅ Rotatable Wet End — Wet end moves left or right in 90-degree increments by loosening the four thru-bolts to align with existing plumbing configurations

✅ 2″ MBT Connections — Both suction (center) and discharge (side) use 2″ Male Buttress Thread (MBT) with 3-1/16″ outer thread measurement

✅ Side Discharge Configuration — Optimized for Sundance/Jacuzzi equipment bay layouts

✅ Multi-Brand Compatibility — Serves Sundance, Jacuzzi (Piranha), and Gatsby spa brands

✅ Direct Interchangeability — Functionally identical to 6500-343/6500-343S; drop-in replacement for all legacy 2-speed TheraMax and TheraFlo pumps

🔩 Technical specifications

⚠️ Note on NB1 Designation: The “NB1” identifies this as the LX Lingxiao motor variant of the TheraMax pump platform. It shares the same wet end, port sizes, frame dimensions, and electrical specifications as the 6500-343 (Emerson motor variant). Both are fully interchangeable — the difference is in the motor manufacturer, not the pump function or performance.

⚡ Electrical Requirements

⚠️ IMPORTANT ELECTRICAL SAFETY:

All electrical work must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes. Hot tubs require GFCI (Ground Fault Circuit Interrupter) protection. A dedicated circuit is required — do not share with other appliances. Verify your spa’s voltage before ordering. Using the wrong voltage will damage the motor and void the warranty. This pump does not include a power cord — reuse your existing 2-speed AMP cord or purchase a compatible cord separately.

🔗 Compatibility Guide

Frame & Port Configuration

Specification	Detail
Frame	48 Frame (NB1, Thru-Bolt)
Discharge	2″ MBT — Side (Rotatable in 90° increments)
Suction	2″ MBT — Center
Thread OD	3-1/16″ (outside thread to outside thread)
Motor Base	Baseless — Requires 6000-532 bracket

Compatible Sundance Spa Models

This pump is the factory OEM primary (pump #1) replacement for the following Sundance spa models:

• Altamar (1998–2003)
• Bahia (11/2002+)
• Calypso (1997)
• Cameo / Optima (1997–2003)
• Marin (1998–1999, 2004+)
• Maxxus (1999+ — Pump #1)
• Telluride (S/N #TL34439+, 1998–04/1999)

Compatible Jacuzzi Spa Models

This pump is also known as the Jacuzzi “Piranha” pump and is used on the following Jacuzzi models:

• J-230 & J-335 (until July 2010)
• J-270 / J-280 (2007–July 2010)
• J-325 (2005–2006)
• J-345
• J-355
• J-360 (2002–2003)
• J-365
• J-385

Compatible Gatsby Spa Models

• S35A9-B

Replaces These Legacy Part Numbers

This pump directly replaces the following older TheraMax and Aqua-Flo XP pump part numbers:

• 6500-128
• 6500-138
• 6500-254
• 6500-760

💡 Extended Cross-Reference: Because the 6500-092 is functionally interchangeable with the 6500-343, it also serves as a replacement for the full list of legacy 2-speed TheraMax part numbers: 6500-137, 6500-260, 6500-261, 6500-264, 6500-265, 6500-268, 6500-347, 6500-753, 6500-754, 6500-757, 6500-761, 6500-762, 6500-764, 6500-765, 6500-768, and Thermax designations 06120193-2, 06125198-2, 06120193-210.

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📐 Alternate Part Numbers

This pump may be listed under the following part numbers across different retailers and distributors:

Alternate Part Number	Notes
6500-092	OEM Part Number (Primary — NB1 LX Motor)
SD6500-092	Sundance prefix variant (JettedHotTubsAndMore)
SUN6500-092	Alternate designation
6500-343	Interchangeable OEM equivalent (Emerson motor variant)
6500-343S	Updated production variant of 6500-343
6500-094	Related NB1 Series variant (listed alongside 6500-092)
4234211-S	Balboa Water Group / TheraMax designation
SD6500-343	Sundance prefix variant of interchangeable model
SUN6500-343	Designation of interchangeable model

💡 About 6500-092 vs 6500-343: The 6500-092 is the NB1 Series LX-motor variant, while the 6500-343 is the original Emerson-motor TheraMax. Both are 2.5 HP, 2-speed, 230V, 48-frame baseless pumps with identical wet ends, port configurations, and mounting dimensions. The choice typically depends on availability and pricing.

💡 About 6500-092 vs 6500-091: The 6500-092 is the 2-speed NB1 pump (primary pump #1), while the 6500-091 is the 1-speed NB1 pump (secondary pump #2). Both are 2.5 HP, 230V, 48-frame, but the 6500-092 has dual-speed capability for combined jet and filtration functions.

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🛠️ Installation Requirements

Mounting

Requirement	Specification
Mounting Type	Baseless — Requires 6000-532 bracket
Bracket	Wraps around motor body, mounts to equipment bay chassis
Position	Horizontal
Base	Solid, level, vibration-dampening surface
Ventilation	Minimum 6 inches clearance around motor for cooling
Access	Sufficient clearance for maintenance and wet end rotation

Plumbing

Connection	Size
Suction	2″ MBT (Center)
Discharge	2″ MBT (Side — Rotatable)
Thread OD	3-1/16″
Unions	Standard 2″ FBT pump unions (sold separately)

Installation Notes

⚠️ Pump must be installed below water level (flooded suction) to ensure proper priming

⚠️ Never run pump dry — causes mechanical seal damage and motor overheating

⚠️ Ensure proper grounding and bonding per NEC requirements

⚠️ GFCI protection is required by code for all hot tub and spa installations

⚠️ This pump does not include a power cord — reuse your existing 2-speed AMP cord or purchase a compatible cord separately

⚠️ Mounting bracket (6000-532) is sold separately — you may reuse your existing bracket if in good condition

⚠️ The 6540-171 hose barb used on many Sundance/Jacuzzi pumps has non-standard threads (NOT standard MPT). Do not use over-the-counter hardware store hose barbs — they will strip the threads and damage the pump housing, which is not covered under warranty

💡 Wet End Rotation: The wet end can be moved either to the left or right to accommodate your plumbing. Loosen the four thru-bolts on the rear of the pump, rotate the wet end to the desired position, and retighten the bolts securely.

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🔧 Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around mechanical seal and union connections
Inspect unions and O-rings	Monthly	Tighten if needed; replace O-rings if leaking
Clean strainer/filter	As needed	Remove debris to maintain proper flow
Check amperage draw	Annually	Should read approximately 11.0 A (high) / 3.3 A (low); higher readings indicate potential issues
Inspect motor vents	Quarterly	Keep clear of debris for proper cooling
Check mounting bracket	Quarterly	Ensure bracket is secure and motor is not shifting

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, or humming without rotation)
• Water leaking from the mechanical seal area
• Motor repeatedly trips the circuit breaker
• Noticeably reduced water flow or weak jets
• Motor overheating or burning smell
• Low speed no longer functions (capacitor or winding failure)
• Visible corrosion or damage to the wet end

Seal Replacement

Detail	Specification
Seal Type	Mechanical Seal
Replacement	Replace at first sign of leakage from the seal area

⚠️ When replacing the seal, also inspect the impeller and volute for wear or damage. The 2 HP impeller (part 6500-309, 4.025″ diameter) is used in TheraMax/TheraFlo pumps from 07/2003 onward.

🎯 Ideal Applications

Application	Suitability	Notes
♨️ Hot tub primary jet pump (#1)	✅ Yes	Primary application — designed as the main 2-speed jet pump for Sundance, Jacuzzi, and Gatsby spas
♨️ Filtration/circulation (low speed)	✅ Yes	Low speed (1,725 RPM / 3.3A) provides quiet filtration and circulation between bathing sessions
♨️ Jet performance (high speed)	✅ Yes	High speed (3,450 RPM / 11.0A) delivers full hydrotherapy jet power during use
🛁 Whirlpool bath	⚠️ Check compatibility	May work in whirlpool applications with matching 48-frame and 2″ MBT port specifications

💡 2-Speed vs 1-Speed: This 6500-092 is the primary 2-speed pump (pump #1) in Sundance spa systems. For the secondary 1-speed pump (pump #2), see Sundance part number 6500-091 (NB1 Series) or 6500-341 (Emerson motor variant).

❓ Frequently Asked Questions

Q: What horsepower is this pump? A: This pump is rated at 2.5 HP continuous duty. The high speed operates at 3,450 RPM (11.0 Amps) and low speed at 1,725 RPM (3.3 Amps).

Q: What is the NB1 designation? A: NB1 identifies the LX Lingxiao motor platform used in this variant. It replaces the earlier Emerson-motor TheraMax (6500-343) while maintaining identical wet end dimensions, port sizes, and mounting compatibility. Both versions are fully interchangeable.

Q: What is the difference between 6500-092 and 6500-343? A: Both are 2.5 HP, 2-speed, 230V, 48-frame baseless TheraMax pumps with identical specifications. The 6500-092 uses an LX Lingxiao motor (NB1 Series), while the 6500-343 uses an Emerson motor. They are functionally interchangeable — the wet end, ports, mounting, and performance are the same.

Q: What is the difference between 6500-092 and 6500-091? A: The 6500-092 is the 2-speed primary pump (pump #1) with high and low speed operation for combined jet and filtration functions. The 6500-091 is the 1-speed secondary pump (pump #2) that runs at a single high speed. Both are NB1 Series, 2.5 HP, 230V, 48-frame LX pumps.

Q: Will this fit my Sundance or Jacuzzi hot tub? A: This pump fits Sundance 880 series models from 1997 onward (Altamar, Cameo, Optima, Marin, Maxxus pump #1) and Jacuzzi J-300 series models through July 2010. Verify your existing pump’s frame size (48 frame), port sizes (2″ MBT), and voltage (230V) before ordering. Check the compatibility list above for your specific spa model.

Q: What voltage does this pump require? A: 230V / 60Hz single phase (also referred to as 240V nominal). All electrical installation must be performed by a licensed electrician. Verify your spa’s voltage before ordering.

Q: Does this pump come with a power cord? A: No, this pump does not include a power cord. Reuse your existing 2-speed AMP cord from your old pump, or purchase a compatible 2-speed AMP cord separately.

Q: Does this pump come with a mounting bracket? A: No, the mounting bracket (part #6000-532) is sold separately. This is a baseless pump that requires the bracket which wraps around the motor body. You may reuse your existing bracket if it is in good condition.

Q: Can I rotate the wet end to match my plumbing? A: Yes, the wet end can be moved either to the left or right. Loosen the four thru-bolts on the rear of the pump, rotate the wet end to align with your existing plumbing, and retighten the bolts securely.

Q: What size are the ports? A: Both the suction (center) and discharge (side) ports are 2″ MBT (Male Buttress Thread). The outer thread dimension measures 3-1/16″ from outside thread to outside thread. Note: these are NOT standard MPT threads.

Q: Can I use a standard hardware store hose barb on this pump? A: No, the 6540-171 hose barb used on many Sundance/Jacuzzi pumps has non-standard threads that are NOT standard MPT. Using an over-the-counter hose barb will strip the threads and damage the pump housing, which is not covered under warranty. Use only the OEM Sundance hose barb.

Q: Can I replace my 6500-343 with this 6500-092? A: Yes, the 6500-092 (NB1 LX motor) is a direct drop-in replacement for the 6500-343 (Emerson motor). They share identical wet ends, port sizes, frame dimensions, and electrical specifications. No plumbing or mounting modifications are required.

Q: What warranty is included? A: Contact Parts4Tubs for full warranty terms and conditions.

Q: How do I know if my pump needs replacing? A: Common signs include unusual noise (grinding, screeching), water leaking from the seal area, reduced water flow or weak jets, the motor tripping the circuit breaker, low speed no longer functioning, or the motor overheating.

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 and spa installations.

🏆 Why Choose the Sundance TheraMax NB1 6500-092

✅ NB1 Series LX Motor — Updated motor platform with proven reliability and full compatibility with all existing Sundance/Jacuzzi 48-frame installations

✅ Dual-Speed Efficiency — High speed for powerful jets, low speed for quiet filtration; one pump handles both functions, reducing energy costs

✅ Powerful 2.5 HP Motor — Delivers strong, consistent jet pressure at 3,450 RPM for a satisfying hydrotherapy experience

✅ Universal Installation Flexibility — Baseless design with rotatable wet end adapts to virtually any existing plumbing configuration

✅ Full Interchangeability — Drop-in replacement for 6500-343, 6500-343S, and all legacy 2-speed TheraMax/TheraFlo part numbers — no modifications needed

✅ Multi-Brand Compatibility — Works across Sundance, Jacuzzi (Piranha), and Gatsby spa brands

🤝 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

✅ Mounting bracket (6000-532) and replacement parts available

✅ Replacement seals, impellers, unions, and AMP cords available

✅ Dedicated customer service team

Need Help? Contact our team for compatibility advice. We can help verify this pump fits your specific Sundance, Jacuzzi, or Gatsby spa model.

⭐ Summary

The Sundance/Jacuzzi TheraMax NB1 6500-092 is a 2.5 HP dual-speed, 230V/60Hz OEM primary jet pump featuring the LX Lingxiao motor platform for Sundance, Jacuzzi (Piranha), and Gatsby spas. Drawing 11.0 Amps at 3,450 RPM on high speed and 3.3 Amps at 1,725 RPM on low speed, this pump delivers both powerful jet performance and quiet filtration from a single unit. Featuring a 48-frame baseless design with rotatable wet end, 2″ MBT connections (3-1/16″ thread OD), and full interchangeability with the 6500-343/6500-343S, this NB1 Series pump is a direct drop-in replacement for all legacy 2-speed TheraMax pumps. Mounting bracket 6000-532 sold separately. Available now at Parts4Tubs.

Find the right pump or motor

Enter what is printed on the label of the one you are replacing. Anything that differs is shown with the difference spelled out, so you can judge it for yourself.

EitherComplete pumpMotor only

Make or modelHorsepowerVoltageAny115V230VSpeedAny1-speed2-speedVariable speedAmpsPort size (pumps)Any3/4 in1 in1-1/2 in2 in2-1/2 inFrame (motors)Any48Y48 frame56Y56J56C56 frame

Clear

Port size is the plumbing thread, not the pipe — a 2 inch union measures about 3 inches across the male thread. Amps are compared to within half an amp, since published figures round differently between motor brands. Voltage is never treated as a near miss: a 115V motor is not one step from a 230V supply. Anything whose page does not publish a figure you entered is left out rather than offered with a caveat — search it by name to see it anyway.

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.

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
• 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.