⚙️ Tylö RB Commercial Relay Box for Control Panel – Professional Sauna Control for Heaters up to 20 kW

The essential link between your control panel and commercial-grade sauna heaters – engineered for precision, built for reliability.

📋 Product Overview

The Tylö RB Commercial Relay Box is a professional-grade contactor unit designed to relay signals between Tylö sauna heaters and Elite Cloud or Pure control panels. This Swedish-engineered component enables seamless system management for commercial and high-powered residential sauna installations.

Designed specifically for heaters ranging from 6 to 20 kW, the RB Commercial provides comprehensive connectivity including multiple auxiliary outputs, lighting control, and RS485 communication for up to four control panels. Whether you’re installing a new Sense Commercial heater or upgrading an existing SD/SDK system, this relay box delivers the reliable interface your installation demands.

With over 75 years of sauna expertise, Tylö continues to set the standard for precision-engineered wellness components. The RB Commercial exemplifies this commitment with its robust construction, intelligent connectivity options, and support for advanced features like the Tylarium sauna/steam combination system.

✨ Key Features

✅ Compatible with Heaters 6-20 kW – Supports the full range of Tylö Sense Commercial heaters and legacy SD/SDK models for maximum installation flexibility

✅ Elite Cloud & Pure Control Panel Support – Designed for seamless integration with Tylö’s most advanced control systems, including cloud-enabled operation

✅ Four RS485 Communication Ports – Connect up to four control panels simultaneously using reliable RS485 protocol communication

✅ Triple Auxiliary Outputs – Three auxiliary connections (Aux 0-1 and Aux 2) for controlling additional equipment and accessories

✅ Integrated Lighting Control – Built-in connection for sauna lighting control directly from your control panel

✅ Temperature Sensor Included – NTC 10kΩ sensor with 4-metre cable included for accurate room temperature monitoring

✅ Door Contact with 5m Cable – Pre-wired door switch included for enhanced safety and automatic control features

✅ Tylarium Compatible – Full support for combined sauna heater and steam generator operation (sauna + 1 steam generator)

✅ Legacy System Upgrade – Enables modernisation of older Tylö SK 6.6kW, 8kW and SD/SDK 10.7kW, 16kW, 20kW heaters with new control panels

✅ Professional Construction – Robust enclosure designed for reliable commercial operation with easy access for installation and maintenance

🔧 Technical Specifications

Specification	Value
Model	RB Commercial
Article Number	71016012
Heater Compatibility	6-20 kW
Control Panel Compatibility	Elite Cloud, Pure
Dimensions (W×H×D)	485 × 295 × 110 mm
Weight	5.3 kg
Lighting Outputs	1
Auxiliary Outputs	3 (Aux 0-1, Aux 2)
RS485 Ports	4 (Positions 6-9)
Communication Protocol	RS485
Modular Connectors	RJ10 / RJ45 (Addon)
Max Cable Area (RJ10)	0.14-0.20 mm² / AWG26-AWG24
Temperature Sensor Type	NTC 10kΩ
Sensor Cable Length	4 metres
Door Contact Cable Length	5 metres
Temperature Cut-out	130°C
External Switch LED Power	12VDC (max 40mA)
Installation Type	Wall mounted
Origin	Sweden

🔌 Connection Overview

The RB Commercial features a comprehensive connection layout for complete system integration:

Position	Function	Connector Type	Description
1	NTC Temperature Sensor	RJ10	Room temperature monitoring (10kΩ)
2	External Switch	RJ10	Start/stop operation, constant or impulse
3	Door Contact	RJ10	NO (Normally Open) safety switch
4	SEC/NTC (Optional)	RJ10	Combined temp sensor/cut-out at 130°C
5	Addon	RJ45	Extra relay board expansion (not for network)
6-9	RS485 Control Panels	RJ10	Up to 4 Elite/Pure control panels

Additional Connections:

• Heater output (6-20 kW capacity)
• Distribution box connection
• Lighting output
• 3× Auxiliary outputs

🎯 Compatible Equipment

Control Panels

Control Panel	Features
Elite Cloud	Cloud-based functionality, app control, WiFi connectivity, programmable scheduling
Pure	Touch controls, elegant design, temperature/time adjustment, preset start times

Compatible Heaters

Heater Series	Power Range	Notes
Sense Commercial	16-20 kW	Full native compatibility
Expression	Various	Full compatibility
SD/SDK (Legacy)	10.7kW, 16kW, 20kW	Upgrade existing systems
SK (Legacy)	6.6kW, 8kW	Upgrade existing systems

Steam Integration

System	Capability
Tylarium	Sauna heater + 1 steam generator combination
Steam Commercial	Adapter for operating status activation
Multisteam	Primary/secondary unit synchronisation

⚡ Installation Requirements

Electrical Requirements

Requirement	Specification
Installation	By qualified electrician only
Regulations	In accordance with BS 7671 (IET Wiring Regulations)
Cable Type	Stranded conductor (not solid)
Max Conductor Diameter	3.6 mm

⚠️ DANGER: RB Commercial must be connected by a qualified electrician pursuant to applicable regulations!

Mounting Requirements

• Wall-mounted installation
• Adequate ventilation around the unit
• Accessible location for maintenance
• Clean, dry mounting location
• Sufficient space for cable management

Wiring Notes

• Modular cabling modifications (e.g., shortening wires) require crimp pliers
• Use stranded conductors only for modular plug connections
• Maximum cable cross-section for RJ10 connectors: 0.14-0.20 mm² / AWG26-AWG24

🛡️ Safety Features & Integration

Built-in Safety

✅ Temperature Cut-out Protection – 130°C thermal cut-out prevents overheating

✅ Door Contact Integration – Automatic system response when sauna door is opened

✅ LED Status Indication – External switch with LED indication support (12VDC, max 40mA)

✅ Alarm Capability – Door contact with external alarm indication option

System Monitoring

• Real-time temperature monitoring via NTC sensor
• RS485 communication for reliable control panel connectivity
• Humidity sensor support (when used with Combi heater and Tylarium)
• Synchronisation capability for multi-unit installations

🏢 Ideal Applications

Application	Suitability	Notes
🏢 Commercial Saunas	Excellent	Designed for professional installations
🏨 Hotels & Resorts	Excellent	Handles high-capacity heaters up to 20kW
🧖 Spa Facilities	Excellent	Multiple control panel support
🏋️ Fitness Centres	Excellent	Robust commercial-grade construction
🏠 Large Residential	Good	Suitable for high-powered home saunas
🛖 Premium Garden Saunas	Good	When using 6-10kW heaters

🎛️ What’s Included

Item	Quantity	Cable Length
RB Commercial Relay Box	1	–
NTC Temperature Sensor (10kΩ)	1	4 metres
Door Contact (NO type)	1	5 metres
Installation Documentation	1	–

❓ Frequently Asked Questions

Q: What heaters is this relay box compatible with? A: The RB Commercial works with Tylö heaters from 6 to 20 kW, including Sense Commercial (16-20kW), Expression series, and legacy SD/SDK (10.7kW, 16kW, 20kW) and SK (6.6kW, 8kW) models.

Q: Which control panels work with this relay box? A: The RB Commercial is designed specifically for Tylö Elite Cloud and Pure control panels. These must be purchased separately.

Q: Can I connect multiple control panels? A: Yes, the RB Commercial has four RS485 ports (Positions 6-9), allowing connection of up to four control panels simultaneously.

Q: Is a temperature sensor included? A: Yes, an NTC 10kΩ temperature sensor with a 4-metre cable is included. A door contact with 5-metre cable is also included.

Q: Can I use this to upgrade my older Tylö heater? A: Yes, the RB Commercial enables upgrading older SD/SDK and SK series heaters to work with modern Elite Cloud and Pure control panels.

Q: What is Tylarium compatibility? A: Tylarium support means you can control both a sauna heater and a steam generator from a single system, creating a combined sauna/steam experience.

Q: Who can install this relay box? A: Installation must be carried out by a qualified electrician in accordance with BS 7671 (IET Wiring Regulations) and local building codes. This is a legal requirement for safety.

Q: What’s the difference between RB Commercial and RB Commercial Lite? A: The RB Commercial supports heaters up to 20kW and has 3 auxiliary outputs. The Commercial Lite version supports heaters up to 10.7kW and has fewer auxiliary connections.

📥 Downloads & Resources

📄 Installation & User Guide (PDF) – Connection diagrams and modular connector descriptions

🏆 Why Choose the Tylö RB Commercial

✅ Swedish Engineering Excellence – 75+ years of sauna expertise in every component

✅ Commercial-Grade Reliability – Built for demanding professional environments

✅ Future-Proof Your Installation – Cloud connectivity ready with Elite Cloud support

✅ Comprehensive Connectivity – Four RS485 ports and multiple auxiliary outputs

✅ Legacy System Compatible – Breathe new life into existing Tylö installations

✅ Complete Kit Included – Temperature sensor and door contact supplied

🤝 Why Buy from Parts4Tubs

✅ UK-Based Company – Local support and expertise

✅ Fast UK Delivery – Quick dispatch for in-stock items

✅ Expert Advice – Sauna specialists available to help with technical questions

✅ Competitive Pricing – Great value on genuine Tylö components

✅ Full Warranty Support – Manufacturer warranty backed by our service

✅ Easy Returns – 30-day return policy for peace of mind

✨ Summary

The Tylö RB Commercial Relay Box delivers professional-grade control integration for commercial sauna installations up to 20 kW. With comprehensive connectivity including four RS485 ports for multiple control panels, three auxiliary outputs, and full Tylarium support, this Swedish-engineered component is the essential link between your Elite Cloud or Pure control panel and high-powered Tylö heaters. Complete with temperature sensor and door contact included, backed by Tylö’s 75-year reputation and Parts4Tubs expert support – order today for fast UK delivery.