HydroQuip Ultimate Plus Spa Circuit Board — 33-0025A-R8 — 230V Digital MP Universal 10-Key Control System

OEM replacement board for Baja Spas and Whitewater Spas — engineered to the original Ultimate Plus specification.

⚠️ IMPORTANT — PLEASE READ BEFORE ORDERING

• This is a non-returnable item. HydroQuip circuit boards cannot be resold to another spa owner as new. Once ordered, they cannot be returned or cancelled. Contact Parts4Tubs to verify compatibility before purchasing.
• OEM processor — Baja Spas and Whitewater Spas only. This board (33-0025A-R8) was manufactured specifically for current-production Baja Spas and Whitewater Spas with an OEM processor. Verify your spa brand before ordering.
• Requires 10-button topside control. This board is only compatible with a 10-button HT-2 style topside panel. It will not function properly with an 8-button or 6-button topside.
• Temperature and hi-limit sensors are sold separately. This board does not include sensors. Order HydroQuip sensor PN 59-355-1020 (Temp, 10ft, 3/8″ dia., 4-pin, After 5/03) separately as needed.
• 230V service only. This board is rated for 230VAC and is not a 120V board.
• Verify your existing board’s part number. Order by part number 33-0025A-R8, the model name “Ultimate Plus,” and/or by confirming your system is a HydroQuip PS-9700 series.
• Contact Parts4Tubs before ordering if you are unsure about compatibility.

📋 Product Overview

The HydroQuip Ultimate Plus circuit board (MPN 33-0025A-R8, Revision 8) is a factory-original OEM replacement PCB for the HydroQuip PS-9700 Series spa control system, manufactured specifically for Baja Spas and Whitewater Spas. This “Digital MP Universal 10-Key” board is built on HydroQuip’s versatile MP (Multi-Pump) platform and supports up to three pumps, a circulation pump, blower, ozonator, auxiliary output, and fiber optics or lighting — all operated through a 10-button HT-2 topside control panel.

HydroQuip (a Balboa Water Group brand) designed the 9700 series as one of their most capable residential spa control platforms. The Ultimate Plus designation indicates the full-featured OEM variant used by Baja Spas and Whitewater Spas. This board is the Rev. 8 production version, representing mature, stable firmware for these systems.

The PS-9704 schematic applies to this board’s enclosure/wiring configuration. Temperature and hi-limit sensors are not included and must be purchased separately — the 4-pin HydroQuip sensor is required for units manufactured after May 2003.

💡 Key Features

✅ Factory-Original HydroQuip OEM PCB — 33-0025A-R8, Rev. 8, PS-9700 Series
✅ OEM for Baja Spas and Whitewater Spas — current production with OEM processor
✅ Digital MP Universal 10-Key platform — versatile, fully-featured multi-pump control
✅ Primary Pump (Pump 1) — main jet pump output
✅ Second Pump (Pump 2) — secondary jet pump output
✅ Third Pump or Blower — additional output for third pump or blower
✅ Circulation Pump (Circ Pump) — dedicated low-flow circ pump output
✅ Blower Output — independent blower control
✅ Auxiliary Circuit — programmable auxiliary relay
✅ Ozonator Output — ozone generator support
✅ Fiber Optics / Light Output — spa lighting control
✅ Stereo / Audio Output — AV control capability
✅ HT-2 Topside Compatible — 10-button large rectangle panel (58-355-4051)
✅ 230V / 60Hz — standard US hardwired spa service
✅ Non-replaceable OEM processor — system-matched for Baja / Whitewater performance
✅ 1-Year HydroQuip Manufacturer Warranty

🔩 Technical Specifications

Specification	Value
Manufacturer Part Number	33-0025A-R8
Revision	Rev. 8
System Series	PS-9700 (HydroQuip)
Board Type	Digital MP Universal 10-Key
Input Voltage	230VAC / 60Hz
Compatible Topside	10-button HT-2 (Large Rectangle) — required
Pump 1 Output	Primary pump
Pump 2 Output	Secondary pump
Pump 3 / Blower	Third pump or blower
Circ Pump Output	Optional circulation pump
Ozonator Output	Yes
Auxiliary Output	Yes
Fiber Optics / Light	Yes
Stereo / AV Output	Yes
Sensors Included	No — sold separately (4-pin, After 5/03 type)
Documentation	PS-9704 Schematic (wd4431Rev.PDF)
Warranty	1 year — HydroQuip
Returns	Non-returnable

⚠️ Heater kW and breaker/amp ratings are specific to the PS-9700 enclosure and depend on the heater assembly installed in your spa. Contact Parts4Tubs with your system model number to confirm these values before ordering.

🔗 Compatibility Guide

Compatible Spa Brands:

Brand	Evidence
Baja Spas	Horizon description / multiple retailers
Whitewater Spas	Horizon description / multiple retailers

⚠️ This board was manufactured for Baja Spas and Whitewater Spas with an OEM processor. It is not a universal drop-in for other spa brands. If your spa is not one of these brands, contact Parts4Tubs before ordering.

Required Topside Panel:

Panel PN	Description	Notes
58-355-4051	HT-2 Control Panel, 10ft, Large Rectangle, 10 Button, w/Label	✅ Horizon-confirmed; required

⚠️ This board requires a 10-button topside. An 8-button or 6-button panel will not provide access to all functions.

Sensors (Sold Separately):

Sensor PN	Description	Notes
59-355-1020	Sensor, Temp, HydroQuip, 10ft, 3/8″ dia., 4-pin, After 5/03	Horizon-listed; required if replacing sensors

Temperature and hi-limit sensors are not included with this board. If your existing sensors are worn or failed, order 59-355-1020 separately.

Cross-Reference Part Numbers:

Part Number	Description
33-0025A-R8	This board — MPN Rev. 8
33-0025A-R7	Previous revision (Rev. 7)
33-0025-R8	Related variant
33-0025-R7	Related variant
33-0025-K	Earlier kit version
33-0025A-K	Current “kit” version (Gecko-made, EasyPak EP3000 compatible)
9286-010	OEM catalog number
3-64-7011	OEM catalog number
33-0026A-UR2	Related cross-reference
59-355-1101	HydroQuip catalog cross-reference
33-0010-R8	9400 series board (also replaced by 33-0025A-K)
33-0010-R6, R7	Earlier 9400 variants

Current Replacement Note: The 33-0025A-K (made by Gecko, EasyPak EP3000 platform) is the current production replacement for this board. It is compatible with HydroQuip 9700 and 9800 series systems, including the EP3000 (before June 2019). Contact Parts4Tubs to determine whether the original 33-0025A-R8 OEM board or the current 33-0025A-K is the right choice for your Baja / Whitewater Spa.

🛁 Board Functions

System Output Summary:

Output	Supported
Pump 1 (Primary)	✅ Yes
Pump 2 (Secondary)	✅ Yes
Pump 3 / Blower	✅ Yes
Circulation Pump	✅ Yes
Blower	✅ Yes
Auxiliary Circuit	✅ Yes
Ozonator	✅ Yes
Fiber Optics / Light	✅ Yes
Stereo / AV	✅ Yes

Topside Control Note: This board is designed for the HT-2 10-button large rectangle topside panel. The 10-button layout provides individual controls for each output — reducing the need for mode-cycling to access functions. A 10-button panel is required; the system will not operate properly with fewer buttons.

MSPA-to-MP Upgrade Note: If your spa was previously equipped with an older MSPA (Multi-Speed Pump Actuator) style circuit board, it can be upgraded to the MP (Multi-Pump) platform using the MSPA to MP Update Kit (59-355-1102). This kit includes a transformer and sensor and converts the spa’s control wiring to the MP standard. Contact Parts4Tubs for upgrade guidance before ordering this conversion kit.

Surge Protection: HydroQuip and Horizon both recommend surge protection for spa control systems. The Intermatic 115V/230V surge protector (60-155-1005) is available from Parts4Tubs and is listed as a recommended accessory for this board.

🔧 Installation Requirements

Pre-Installation Checklist:

• [ ] Confirm spa brand is Baja Spas or Whitewater Spas with OEM processor
• [ ] Confirm existing board part number matches 33-0025A-R8 or cross-references listed above
• [ ] Confirm existing topside is a 10-button HT-2 style
• [ ] Disconnect all power at the GFCI breaker or disconnect before any board work
• [ ] Allow 5 minutes for capacitor discharge after power-off
• [ ] Photograph all wiring and connections before removal
• [ ] Confirm sensors: order 59-355-1020 if replacing sensors
• [ ] Consider ordering the Intermatic surge protector (60-155-1005) if not already installed

Electrical Requirements:

Requirement	Specification
Supply Voltage	230VAC / 60Hz
GFCI Protection	Class A GFCI — NEC Article 680
Ground & Bonding	Required — NEC Article 680
Dedicated Circuit	Required
Disconnect	Within line of sight, minimum 5 ft from spa

⚠️ Confirm your specific enclosure’s breaker rating from the equipment label inside the spa pack. This varies by the heater assembly installed.

🛡️ Safety Warnings

• ⚠️ ALWAYS disconnect all power before circuit board work
• ⚠️ Licensed electrician installation required; NEC Article 680 compliance mandatory
• ⚠️ Class A GFCI required; grounding and bonding required per NEC Article 680
• ⚠️ 230V only — confirm power supply before installation
• ⚠️ Sensors are not included — do not operate without properly installed temp and hi-limit sensors
• ⚠️ 10-button topside required — do not use with fewer than 10-button panel
• ⚠️ This is an OEM board for Baja Spas and Whitewater Spas — not a universal drop-in for other brands
• ⚠️ Non-returnable — verify compatibility before ordering
• ⚠️ Surge protection recommended — use Intermatic 115V/230V protector (60-155-1005)

🎯 Ideal Applications

Application	Suitability	Notes
♨️ Baja Spas — PS-9700 series with 10-button HT-2	✅ OEM direct replacement	Confirm OEM processor
♨️ Whitewater Spas — PS-9700 series	✅ OEM direct replacement	Confirm OEM processor
♨️ HydroQuip 9700 series systems generally	✅ Compatible	10-button panel required
♨️ HydroQuip 9800 series	✅ Compatible (33-0025A-K variant)	Confirm via 33-0025A-K cross-ref
♨️ MSPA-to-MP upgrade	✅ With update kit 59-355-1102	Requires transformer + sensor kit

❓ Frequently Asked Questions

Q: Do sensors come with this board? A: No. Temperature and hi-limit sensors are sold separately. For spas manufactured after May 2003, order HydroQuip sensor PN 59-355-1020 (10ft, 3/8″ dia., 4-pin). Contact Parts4Tubs to confirm the correct sensor for your spa.

Q: My spa has an 8-button topside. Will this board work? A: No. This board requires a 10-button HT-2 topside control panel. An 8-button panel will not give access to all functions and is not compatible with this board’s software.

Q: What is the MSPA to MP Update Kit (59-355-1102)? A: It is a conversion kit for upgrading an older MSPA (Multi-Speed Pump Actuator) spa control system to the newer MP (Multi-Pump) platform that this board uses. It includes a transformer and sensor to complete the conversion. If your spa currently has an MP-style board (33-0025A or 33-0010 series), you likely do not need this kit — it is for older MSPA systems.

Q: What is the difference between 33-0025A-R8 and 33-0025A-K? A: The 33-0025A-R8 is the original HydroQuip OEM board used in Baja Spas and Whitewater Spas with the OEM processor. The 33-0025A-K is the current production version (made by Gecko, EasyPak EP3000 compatible) that replaces the R8. For a like-for-like OEM replacement in your Baja or Whitewater Spa, the 33-0025A-R8 is the direct match. Contact Parts4Tubs for guidance on which to choose.

Q: Is a surge protector recommended? A: Yes. HydroQuip recommends surge protection for their spa control systems. The Intermatic 115V/230V surge protector (60-155-1005) is listed as a recommended accessory.

Q: What warranty is included? A: HydroQuip warrants this product to be free from defects in materials and workmanship for one year from the date of purchase. The warranty covers repair or replacement of the defective part. It excludes normal wear, freezing, low voltage, chemical damage, accident, negligence, improper installation or alteration. Contact Parts4Tubs for full warranty terms.

⭐ Why Choose the HydroQuip Ultimate Plus 33-0025A-R8

✅ Factory-original HydroQuip OEM board — matches your Baja Spa or Whitewater Spa exactly
✅ Rev. 8 — mature, stable production firmware for the PS-9700 series
✅ Full multi-pump, multi-output capability — pumps, circ, blower, ozone, AV, light
✅ HT-2 10-button topside compatible — full control access
✅ Active product — currently available, not discontinued
✅ 1-year HydroQuip manufacturer warranty
✅ Non-returnable — Parts4Tubs verifies OEM fit and sensor requirements before you order

🤝 Why Buy from Parts4Tubs

✅ Fast US shipping
✅ Expert technical advice — HydroQuip and Balboa Water Group specialists
✅ Competitive pricing
✅ Full warranty support
✅ Matching HT-2 topsides, sensors (59-355-1020), and surge protectors (60-155-1005) available
✅ MSPA-to-MP upgrade kit (59-355-1102) available for system conversions

🔌 Summary

The HydroQuip Ultimate Plus circuit board (33-0025A-R8, Rev. 8) is a factory-original OEM PCB for Baja Spas and Whitewater Spas running the HydroQuip PS-9700 Series. Operating on 230VAC, it is the “Digital MP Universal 10-Key” board supporting two main pumps, a third pump or blower, circ pump, ozonator, auxiliary circuit, and fiber optics or lighting — all via a 10-button HT-2 topside. Temperature and hi-limit sensors are not included and must be ordered separately (PN 59-355-1020). This is a non-returnable board — confirm your OEM processor, spa brand, and topside button count before ordering.