⚡ Sundance Jacuzzi TheraMax Spa Pump 6500-341 — 2.5 HP Single-Speed 230V 48-Frame

Factory OEM jet pump engineered for Sundance 850/880 and Jacuzzi J-300 series spas since 1997

♨️ Product Overview

The Sundance/Jacuzzi TheraMax 6500-341 is a factory OEM 2.5 HP continuous duty (4.2 HP uprated) single-speed jet pump engineered specifically for Sundance and Jacuzzi spa systems. Built to Sundance/Jacuzzi specifications by Balboa Water Group, this 48-frame baseless pump operates at 230V/60Hz with a 10.0 Amp draw, delivering powerful and consistent jet performance for hydrotherapy applications. The TheraMax series has been the workhorse pump platform for Sundance Spas since 1997, evolving from earlier Aqua-Flo “XP” series pumps (1997-1999) and Vico “Ultra Jet” designs (1994-1996) into today’s highly versatile replacement solution. The baseless (bracketless) motor design mounts using the separate 6000-532 bracket that wraps around the motor casing, and the rotatable wet end can be repositioned in 90-degree increments to match any existing plumbing configuration without modifications. This pump serves Sundance, Jacuzzi (branded as Piranha), and Gatsby spas, and is the direct replacement for numerous legacy TheraMax, TheraFlo, and Aqua-Flo XP pump part numbers. It is typically installed as the secondary (pump #2) single-speed jet pump in multi-pump Sundance spa configurations.

🌟 Key Features

✅ Factory OEM Specification — Genuine Sundance/Jacuzzi TheraMax pump by Balboa Water Group, used across the 850/880 series and Jacuzzi J-300 series platforms since 1997

✅ 2.5 HP Continuous / 4.2 HP Uprated Motor — 2.5 HP continuous duty rated with 4.2 HP uprated (brake horsepower) for strong, sustained jet performance

✅ 230V / 60Hz Single-Speed — North American electrical standard with efficient 10.0 Amp draw on a single-speed motor

✅ 48-Frame (48Y) Thru-Bolt Construction — Industry-standard 48Y 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 rotates in 90-degree increments by loosening the four thru-bolts, allowing alignment to 3, 6, 9, or 12 o’clock positions to match existing plumbing

✅ 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 with adjustable wet end positioning

✅ Broad OEM Compatibility — Replaces all previous TheraMax, TheraFlo, Aqua-Flo XP, and Vico pump part numbers dating back to 1994

✅ Multi-Brand Use — Compatible with Sundance, Jacuzzi (Piranha), and Gatsby spa brands

✅ 1-Year Manufacturer Warranty — Backed by manufacturer’s limited warranty on parts

🔩 Technical Specifications

Specification	Value
Pump Series	TheraMax (also known as Piranha in Jacuzzi models)
Manufacturer	Balboa Water Group (for Sundance/Jacuzzi)
OEM Part Number	6500-341
Updated Part Number	6500-091 (Functionally Identical)
Horsepower (Continuous)	2.5 HP
Horsepower (Uprated / Brake)	4.2 HP
Speed Settings	Single Speed (1-Speed)
Voltage	230V (240V nominal)
Frequency	60 Hz
Amperage	10.0 Amps
Frame Type	48Y (48 Frame, Thru-Bolt)
Discharge Location	Side
Discharge Size	2″ MBT (Male Buttress Thread)
Suction Size	2″ MBT (Male Buttress Thread)
Thread OD (Outer Thread)	3-1/16″ (outside thread to outside thread)
Motor Base	Baseless (No Feet) — Bracket Required
Mounting Bracket	6000-532 (Sold Separately)
Cord Type	NONE (Not Included)
Wet End Rotation	Adjustable in 90° increments (Thru-bolt design)
Warranty	1-Year Manufacturer’s Limited (Parts)
UPC	682318852627

⚠️ Note on HP Ratings: This pump carries dual HP ratings common in the spa industry. The 2.5 HP continuous rating reflects the sustained operating output used for pump selection and replacement matching. The 4.2 HP uprated (brake HP) figure represents peak input power under specific test conditions.

🔌 Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	230V (240V nominal)
Frequency	60 Hz
Phase	Single Phase
Full Load Amps	10.0 A
Cord	Not Included — Reuse existing or purchase separately

⚠️ 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 AMP cord or purchase a compatible 1-speed AMP cord separately.

🔗 Compatibility Guide

Frame & Port Configuration

Specification	Detail
Frame	48 Frame (48Y, 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 (1997–Present)

This pump is the factory OEM replacement used on the following Sundance spa models:

• Altamar (1998+)
• Bahia (11/2002+)
• Calypso / Calypso II (1997)
• Cameo (1997+)
• Certa
• Chelsee
• Hamilton
• Hartford
• Hawthorne
• Madison
• Majesta
• Marin (2004+)
• Maxxus (1999+ — Pump #2 and #3)
• Montego
• Optima (1997+)
• Palermo
• Telluride (1998–04/1999, 2005–2009)

Compatible Jacuzzi Spa Models

This pump is also known as the Jacuzzi “Piranha” pump and replaces pump #2 on the following Jacuzzi models:

• J-230 (2005–July 2010)
• J-270 / J-280 (2007–July 2010)
• J-325 (2005–2006)
• J-330 / J-335 (2002–July 2010)
• J-340 / J-345 (2002–July 2010)
• J-350 / J-355 (2002–July 2010)
• J-360 / J-365 (2002–July 2010)
• J-370 / J-375 (2002–July 2010)
• J-380 / J-385 (2002–2006)

Compatible Gatsby Spa Models

• S35A9-B

Replaces These Legacy Sundance Part Numbers

This pump is the current replacement for the following older TheraMax, TheraFlo, and Aqua-Flo XP pump part numbers:

• 6500-126
• 6500-131
• 6500-133
• 6500-263
• 6500-266
• 6500-269
• 6500-307
• 6500-349
• 6500-763
• 6500-766
• 6500-767
• 6500-769
• 6500-824
• 6500-903
• 06020194-2
• T55SWBNC-999

💡 Pump Evolution History: From 1994–1996, Sundance Spas used the Vico “Ultra Jet” pump. Starting in 1997, Sundance transitioned to Aqua-Flo “XP” series pumps branded as TheraFlo (2-speed primary) and TheraMax (1-speed secondary). The current TheraMax design (6500-341) features the baseless motor with separate bracket mounting, replacing all previous fixed-bracket and footed configurations. The updated part number 6500-091 is the latest iteration and is functionally identical to the 6500-341.

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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
6500-341	OEM Part Number (Primary)
6500-091	Updated/Newer Part Number (Functionally Identical)
4234110-S	Balboa Water Group designation
SD6500341	Sundance prefix variant
SD-6500341	Sundance prefix variant (hyphenated)
SD6500-341	Sundance prefix variant
SD-6500-341	Sundance prefix variant (fully hyphenated)
6500341	Compact variant (no hyphens)
SUN6500-341	TheSpaWorks / HotTubOutpost designation

💡 Important: The 6500-091 is the updated/newer version of this same pump. Pool-Spa-Supplies explicitly confirms: “6500-091 New Part Number” replacing 6500-341. If you order either part number, you will receive the current production version. Both are completely interchangeable.

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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 — Sundance spas require at least No. 8 AWG solid copper bonding wire connected to the pressure wire connector on the control box

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

⚠️ This pump does not include a power cord — reuse your existing cord or purchase a compatible 1-speed AMP 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 rotated in 90-degree increments. Loosen the four thru-bolts on the rear of the pump, rotate the wet end to align with your existing plumbing (common positions: 3 o’clock, 6 o’clock, 9 o’clock, or 12 o’clock), and retighten the bolts securely. The pump is typically shipped in the 9 o’clock position.

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🔄 Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around mechanical seal and union connections
Inspect unions	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 10.0 A; 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
• 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 (housing front, part 6000-151) for wear or damage. A worn impeller will reduce pump performance even with a new seal. The 2 HP impeller (part 6500-309, 4.025″ diameter) is used in TheraMax/TheraFlo pumps from 07/2003 onward.

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Hot tub jet pump	✅ Yes	Primary application — designed as a jet pump for Sundance, Jacuzzi, and Gatsby spas
♨️ Secondary jet pump (#2)	✅ Yes	Most common use — single-speed secondary jet pump in multi-pump configurations
♨️ Tertiary jet pump (#3)	✅ Yes	Used as pump #3 on Maxxus and other large multi-pump spa models
🛁 Whirlpool bath	⚠️ Check compatibility	May work in whirlpool applications with matching 48-frame and 2″ MBT port specifications

💡 Usage Note: In Sundance spa systems, this 1-speed pump is typically used as the secondary jet pump (pump #2). For the primary 2-speed pump, see Sundance part number 6500-343 (TheraMax 2-speed version, 2.5 HP continuous / 4.2 HP uprated, 2-speed, 230V).

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❓ Frequently Asked Questions

Q: What horsepower is this pump? A: This pump is rated at 2.5 HP continuous duty with a 4.2 HP uprated (brake horsepower) rating. The 2.5 HP continuous figure is the standard specification used for pump selection and replacement matching.

Q: Will this fit my Sundance or Jacuzzi hot tub? A: This pump is the factory OEM replacement for Sundance 850/880 series models from 1997 to present and Jacuzzi J-300 series models from 2002 to 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 is the difference between 6500-341 and 6500-091? A: The 6500-091 is the updated/newer part number that replaces the 6500-341. They are functionally the same pump. Either part number will work as a replacement. When ordering, you will receive the current production version.

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 AMP cord from your old pump, or purchase a compatible 1-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. Parts4Tubs offers the bracket as a convenient add-on for $54.78.

Q: Can I rotate the wet end to match my plumbing? A: Yes, the wet end rotates in 90-degree increments. 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. The pump is typically shipped in the 9 o’clock position.

Q: Is this pump 1-speed or 2-speed? A: This is a single-speed (1-speed) pump. It is typically used as the secondary jet pump (pump #2) in Sundance spa systems. For the 2-speed primary pump, see part number 6500-343.

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: Does this replace my old Aqua-Flo XP or Vico Ultra Jet pump? A: Yes, the TheraMax 6500-341 is the current factory replacement for all previous Sundance pump platforms including Aqua-Flo XP (1997–1999), older TheraMax with fixed brackets, and Vico Ultra Jet (1994–1996) pumps. See the full list of replaced part numbers in the Compatibility Guide above.

Q: What is the Jacuzzi “Piranha” pump? A: The Jacuzzi Piranha is the same TheraMax pump platform branded under the Jacuzzi name. The 6500-341 serves as the Piranha pump replacement for Jacuzzi J-300 series models (J-230 through J-385).

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 from a hardware store will strip the threads and damage the pump housing, which is not covered under warranty. Use only the OEM Sundance hose barb.

Q: What warranty is included? A: This pump includes a 1-year manufacturer’s limited warranty on parts. 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, 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 6500-341

✅ Factory OEM Pump — Genuine Sundance/Jacuzzi specification by Balboa Water Group, ensuring exact fit and performance

✅ Powerful 2.5 HP / 4.2 HP Uprated Motor — Delivers strong, consistent jet pressure for a satisfying hydrotherapy experience

✅ Universal Installation Flexibility — Baseless design with 90-degree rotatable wet end adapts to virtually any existing plumbing configuration

✅ Proven Platform Since 1997 — The TheraMax has been the standard Sundance/Jacuzzi pump platform for decades, continuously refined

✅ Multi-Brand Compatibility — Works across Sundance, Jacuzzi (Piranha), and Gatsby spa brands with extensive legacy part number cross-referencing

✅ 1-Year Manufacturer Warranty — Backed by manufacturer’s limited warranty for peace of mind

🤝 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) available as convenient add-on

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

✅ Dedicated customer service team

✨ Summary

The Sundance/Jacuzzi TheraMax 6500-341 is a 2.5 HP continuous (4.2 HP uprated) single-speed, 230V/60Hz OEM jet pump by Balboa Water Group for Sundance 850/880 series and Jacuzzi J-300 series spas. Featuring a 48-frame baseless design with a 90-degree rotatable wet end, 2″ MBT connections, 10.0 Amp draw, and compatibility with 16+ legacy part numbers, this proven pump platform has served Sundance and Jacuzzi spas since 1997. It replaces pump #2 on most Sundance and Jacuzzi multi-pump configurations. Mounting bracket 6000-532 sold separately. Backed by a 1-year warranty and available now at Parts4Tubs.

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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: 324 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: 395 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: 109 Min: 1 Step: 1 Add to cart
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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.