🔌 Joyonway P25B85 Control Box – Compact Spa Control System

Space-efficient spa control system designed for streamlined hot tub configurations with essential pump, heating, and accessory management.

📋 Product Overview

The Joyonway P25B85 Control Box is a compact spa control system from Joyonway’s PB series, specifically designed for hot tubs where space is at a premium. This efficient unit manages a single or dual-speed pump with optional circulation pump support, air blower, ozone generator, and 12V lighting from one integrated package.

Featuring a 2kW integrated heater with 2-inch socket union sleeves and AMP connectors, the P25B85 provides reliable water heating and straightforward component connections. The system operates on standard European 230V/50Hz power supply.

Compatible with the Joyonway PB557 and PB559 topside panels, this control box offers intuitive operation with LCD display for temperature monitoring and system control. The compact dimensions make it ideal for spas with limited equipment space whilst still delivering comprehensive control functionality.

⭐ Key Features

• ✅ Flexible Pump Control – Supports single or dual-speed pump with optional circulation pump capability
• ✅ 2kW Integrated Heater – Efficient heating element with 2-inch socket union connections
• ✅ Air Blower Support – Output for air massage system
• ✅ Ozone Generator Ready – Output for water sanitisation equipment
• ✅ 12V DC Lighting – Output for LED spa lighting control
• ✅ Auxiliary Output – Additional output for supplementary accessories
• ✅ Dual Topside Compatibility – Works with PB557 and PB559 LCD display panels
• ✅ AMP Connectors – Easy-connect terminals for component installation
• ✅ Compact Design – Space-efficient enclosure for limited installation areas

⚡ Electrical Specifications

Specification	Value
Input Voltage	220-240V AC
Frequency	50/60Hz
Maximum Amperage (Single Phase)	32A
Heater Output	2.0kW
Heater Type	Integrated with 2″ socket unions
Fuse Rating	T10A / 250V

🔗 Output & Connection Specifications

Output	Specification
Pump 1	Single or dual-speed, with optional circulation pump
Pump 2 / Blower	Single-speed pump or air blower
Ozone	Supported
Light	12V DC
Auxiliary	Supported

Connection Type: AMP connectors

🔄 Compatibility

Compatible Topside Panels:

Panel Model	Compatible	Notes
PB557	✅ Yes	LCD display panel with JETS, AUX, LIGHT, PROGRAM buttons
PB559	✅ Yes	LCD display panel

📐 Physical Specifications

Specification	Value
Dimensions (Including Heater)	434 mm (L) × 201 mm (H) × 82 mm (W)
Dimensions (Box Only)	360 mm (L) × 201 mm (H) × 82 mm (W)
Heater Connection Size	2″ (50mm) socket union sleeves
Connection Type	AMP connectors

🛡️ Safety Features

Safety Feature	Specification
Fuse Protection	T10A / 250V
Thermal Protection	Integrated with heater assembly

💻 Programming & Features

Control Features:

• Pump speed control and sequencing
• Temperature set point adjustment
• Filtration cycle programming
• Manual and automatic heating modes
• Real-time system status display via topside panel

Display Interface Functions:

• Water temperature display
• Operating mode indication
• Filtration cycle status
• Programmed heating display

🔧 Installation Requirements

Pre-Installation Checklist:

• [ ] Electrical supply meets 220-240V/50Hz requirements
• [ ] Appropriate 32A breaker/RCD installed
• [ ] 2″ plumbing compatible with heater union connections

Electrical Requirements:

Requirement	Specification
Supply Voltage	220-240V AC
Frequency	50/60Hz
Circuit Breaker	32A (single phase)
Dedicated Circuit	Required

Connection Notes:

⚠️ Refer to manufacturer wiring diagram and installation manual.

⚠️ All electrical work must comply with BS 7671 (IET Wiring Regulations).

⚠️ Spa electrical installations in the UK require Part P certification.

🎯 Ideal Applications

Application	Suitability	Notes
🏠 Home hot tub	✅ Excellent	Compact design suits smaller spas
🏠 Garden spa	✅ Excellent	Suitable for outdoor installation
🏊 Swim spa	⚠️ May be suitable	Check pump requirements – single pump output
🏢 Holiday let	✅ Excellent	Reliable design for regular use
🔄 Replacement/Upgrade	✅ Excellent	Direct replacement for older systems

❓ Frequently Asked Questions

Q: Will this control box work with my spa?

A: The P25B85 is designed for spas requiring single or dual-speed pump control with optional circulation pump. Compatibility depends on your spa’s electrical requirements, plumbing configuration (2″ connections required for heater), and component specifications. Contact Parts4Tubs with your spa model details for confirmation.

Q: Do I need a qualified electrician to install this?

A: Yes. All spa control box installations must be performed by a qualified electrician in compliance with BS 7671 and Part P regulations.

Q: What topside panel does this work with?

A: The P25B85 is compatible with two Joyonway topside panels: PB557 and PB559. Both feature LCD displays. Topside panels are sold separately.

Q: Can this replace my existing control box?

A: The P25B85 can replace many older or discontinued spa control systems. It’s particularly suited for compact spas with single pump configurations. Contact Parts4Tubs with your current control box model for replacement advice.

Q: Does this include a topside panel?

A: No. This listing is for the P25B85 control box with integrated 2kW heater only. Compatible topside panels (PB557 or PB559) are sold separately.

Q: What is the difference between P25B85 and P20B29?

A: The P25B85 is a more compact unit with a 2kW heater, designed for smaller spas with fewer pump requirements. The P20B29 is larger with a 3kW heater and supports up to four massage pumps.

Q: What pump configurations does this support?

A: The P25B85 supports a single or dual-speed pump on Pump 1 output, with optional circulation pump capability. The Pump 2/Blower output can accommodate either a single-speed pump or an air blower.

🏆 Why Choose the Joyonway P25B85

• ✅ Compact Design – Space-efficient dimensions suit spas with limited equipment areas
• ✅ 2kW Integrated Heater – Efficient heating with replaceable element for long-term serviceability
• ✅ Flexible Pump Options – Single or dual-speed pump support with optional circulation pump
• ✅ Dual Topside Compatibility – Choice of PB557 or PB559 LCD display panels
• ✅ AMP Connectors – Easy-connect terminals simplify component installation
• ✅ Comprehensive Control – Manages pump, heater, blower, ozone, lighting, and auxiliary outputs

🤝 Why Buy From Parts4Tubs

• ✅ UK-based company with local support
• ✅ Fast UK delivery
• ✅ Expert advice from spa specialists
• ✅ Competitive pricing
• ✅ Full warranty support
• ✅ Easy returns within 30 days
• ✅ Compatible components and accessories available
• ✅ Technical support for installation queries

✨ Summary

The Joyonway P25B85 is a compact 220-240V/50Hz spa control system featuring an efficient 2kW integrated heater and support for single or dual-speed pump with optional circulation pump, air blower, ozone generator, and 12V lighting. Compatible with PB557 and PB559 LCD display topside panels, this space-efficient control box features AMP connectors for straightforward installation and 2-inch heater union connections. Ideal for smaller spas and replacement applications where space is at a premium. Contact Parts4Tubs today for compatibility advice and expert support.