Black Nest

The Black Nest Sauna Heater combines an elegant open-frame nest design with a striking matte black finish. This premium heater makes a bold statement in contemporary sauna interiors, particularly those featuring dark timber or modern minimalist design.

The basket-style construction surrounds the heating elements with stones on all sides, creating efficient heat distribution and exceptional steam quality. With 75kg of stone capacity, the Nest heater delivers authentic Finnish sauna performance with soft, even heat and excellent löyly (steam) production.

Available in power ratings from 3kW for compact home saunas to 15kW for large commercial installations, this heater adapts to virtually any sauna size. The higher-output models are particularly well suited to spa facilities, wellness centres, gyms, and hotels.

This heater includes Wi-Fi connectivity for smartphone control and an external wall-mounted controller with a digital LCD display. Control your sauna from anywhere using the free app, or adjust settings at the controller outside your sauna door.

The Wi-Fi system includes a compact wireless adapter that connects to your home network. Setup takes just minutes, and the app works with both iOS and Android devices.

All of our sauna heaters are TÜV Safety Certified.

What's Included

- Electric sauna heater unit (nest/basket design, black finish)
- External wall-mounted controller with digital LCD display
- Wi-Fi adapter for smartphone connectivity
- Controller cable for routing through wall
- 75kg premium sauna stones (4 boxes)
- Heater mounting brackets and hardware
- Installation manual (English)

Technical Specifications

Heater Dimensions
- Diameter: 620mm
- Height: 380mm
- Weight: 12kg (heater only, without stones)
- Stone Capacity: 75kg
- Finish: Matte black powder coat

Electrical Requirements
- Voltage: 220–240V single-phase (3kW–9kW models)
- Power Options: 3kW / 4.5kW / 6kW / 9kW / 12.5kW / 15kW
- Circuit: Dedicated circuit with appropriate MCB required
- Wiring: Hardwired installation (no plug)
- Note: 12.5kW and 15kW models may require three-phase power

Controller Specifications
- Type: External wall-mounted with Wi-Fi
- Display: Digital LCD screen
- Temperature Range: 40–110°C
- Timer: Up to 8 hours
- Mounting: Outside sauna room
- Wi-Fi: 2.4GHz wireless (adapter included)
- App: Free iOS and Android application

Performance
- Operating Temperature: 70–100°C (typical sauna range 80–90°C)
- Heat-up Time: 30–45 minutes to reach 80°C (varies by room size)
- Stone Heating: Direct contact for efficient steam production

Heater Size Guide

3kW Heater
Suitable for 3–5 cubic metres. Example: 1.2m × 1.2m × 2.1m (1–2 person sauna)

4.5kW Heater
Suitable for 4–7 cubic metres. Example: 1.5m × 1.5m × 2.1m (2–3 person sauna)

6kW Heater
Suitable for 6–10 cubic metres. Example: 1.8m × 1.8m × 2.1m (3–4 person sauna)

9kW Heater
Suitable for 9–16 cubic metres. Example: 2.2m × 2.2m × 2.2m (5–6 person sauna)

12.5kW Heater
Suitable for 12–20 cubic metres. Commercial installations. May require three-phase power.

15kW Heater
Suitable for 15–25 cubic metres. Large commercial installations. May require three-phase power.

Note: For outdoor saunas or rooms with large glass windows, add 20% to your cubic metre calculation when selecting heater size.

• Striking matte black finish for contemporary sauna interiors
• Elegant open-frame nest design showcases stone load
• 75kg stone capacity for superior heat retention and steam
• Available from 3kW (home use) to 15kW (commercial)
• Wi-Fi connectivity included for smartphone app control
• External wall-mounted controller with digital LCD display
• Control your sauna from anywhere via free iOS or Android app
• Stainless steel basket construction with black powder coating
• Optimal air circulation through open design
• Suitable for residential and commercial applications
• Quick heat-up time of 30–45 minutes
• TÜV Safety Certified
• 220–240V single-phase power (standard Thai electrical)
• Three-phase options available for 12.5kW and 15kW models

Please ensure electrical work is completed by a licensed electrician.

Installation

• Professional electrical installation required
• Heater must be hardwired to a dedicated circuit by a licensed electrician
• Floor-mounted design — wider profile (620mm diameter) requires sufficient floor space
• External controller requires small hole through sauna wall for cable connection
• Sisu Sauna provides installation guidance but does not install standalone heaters
• We recommend hiring a local electrician familiar with high-amperage appliance installation
• For 12.5kW and 15kW commercial installations, consult your electrician regarding three-phase power requirements
• Wi-Fi setup is simple — adapter plugs into controller and pairs with app in minutes

Installation typically requires:

• Dedicated electrical circuit (30–60A depending on heater size)
• Appropriate MCB/circuit breaker
• Heat-resistant wiring rated for sauna conditions
• Small wall penetration for controller cable
• Wi-Fi network with 2.4GHz support
• Adequate floor space and surrounding clearance

Delivery

• Free delivery throughout Thailand
• Standard delivery timeframe is 3–6 weeks from order confirmation
• Heater, controller, Wi-Fi adapter, and stones ship separately
• Stones ship in 4 boxes due to weight
• Delivery to ground floor or building loading dock
• Stairs or lift access may incur additional handling fees

Regular Maintenance

• Inspect stones every 6–12 months and rotate or replace cracked stones
• Wipe down exterior basket frame with a damp cloth when cool
• Check controller display and connections periodically

Black Finish Care

• The black powder coat finish is heat-resistant and designed for sauna conditions
• Normal use will not cause fading
• Mineral deposits from water splashing during löyly may appear over time
• Wipe clean with a damp cloth when the heater is cool

Stones

• Use only sauna-grade stones rated for high heat
• Replace any stones that have cracked or deteriorated
• Arrange stones loosely within the basket to allow air circulation

Wi-Fi System

• Keep adapter firmware updated via the app when prompted
• Ensure stable 2.4GHz Wi-Fi signal reaches controller location

Professional Service

• Have a qualified electrician inspect connections annually
• Contact Sisu Sauna if you notice any unusual operation
• For detailed care instructions, visit sauna.in.th/support

Q: What size heater do I need for my sauna?

A: Calculate the interior volume of your sauna room in cubic metres (length × width × height). As a general guide, allow approximately 1kW per 1.5–2 cubic metres. For outdoor saunas or rooms with large windows or glass doors, add 20% to account for heat loss. Use the Heater Size Guide in the specifications to match the right heater to your space.

Q: What is the difference between the Black and Silver Nest heaters?

A: The heaters are identical in performance and specifications. The only difference is the finish colour. Choose Black for contemporary interiors, dark timber saunas, or modern minimalist aesthetics. Choose Silver for lighter timber, traditional looks, or when you prefer a bright metallic finish.

Q: What is the nest design and why choose it?

A: The nest design features an open basket frame that surrounds the heating elements with stones on all sides. This creates efficient 360-degree heat distribution and showcases the natural beauty of the sauna stones. The open construction allows excellent air circulation and gives your sauna a contemporary, premium look. The 75kg stone capacity provides superior thermal mass for consistent heat and quality steam.

Q: Is this heater suitable for commercial use?

A: Absolutely. The Nest heater is available in power ratings up to 15kW, making it ideal for commercial spas, wellness centres, gyms, hotels, and resort facilities. The striking black design enhances the premium feel of high-end installations.

Q: What's the difference between 9kW and 12.5kW/15kW models?

A: Models rated at 9kW or below are designed for typical residential saunas and operate on single-phase power. The 12.5kW and 15kW models are designed for larger commercial spaces with higher heat loads and may require three-phase electrical power. Consult your electrician before ordering high-output models.

Q: How does the Wi-Fi control work?

A: The system includes a compact wireless adapter that plugs into the controller. Once connected to your Wi-Fi network, you download the free app to your smartphone. The app lets you turn the sauna on/off, set the temperature, adjust the timer, and monitor current conditions from anywhere with internet access.

Q: Is the Wi-Fi system difficult to set up?

A: Not at all. The adapter plugs directly into the controller and connects to your Wi-Fi network like any smart home device. The app guides you through pairing in a few minutes. No technical expertise or professional setup required.

Q: Can I still use the wall controller if the Wi-Fi is down?

A: Yes. The external wall controller works independently. Wi-Fi adds remote convenience, but the physical controller provides full functionality at all times, even without an internet connection.

Q: Can I install this heater myself?

A: The heater requires professional electrical installation by a licensed electrician. While positioning the heater and setting up Wi-Fi is straightforward, connecting to your electrical supply must be done by a qualified professional to ensure safety and compliance with Thai electrical regulations.

Q: How long does the heater take to warm up the sauna?

A: Expect 30–45 minutes to reach typical sauna temperatures of 80–90°C, depending on room size, insulation quality, and heater power. Larger rooms with appropriate high-power heaters heat efficiently. The generous stone mass retains heat well during sessions.

Q: Are the sauna stones included?

A: Yes. Each heater includes 75kg of premium sauna stones shipped in 4 boxes. These volcanic stones are specifically selected for sauna use and can withstand thermal shock from water contact.

Q: What electrical supply do I need?

A: Standard models (3kW–9kW) operate on Thai 220–240V single-phase power with a dedicated circuit (30–40A). Higher-output models (12.5kW–15kW) may require three-phase power and higher-amperage circuits (up to 60A). Your electrician will assess your electrical panel's capacity and recommend the appropriate setup.

Q: Will the black finish fade or discolour over time?

A: The black powder coat finish is heat-resistant and designed for sauna conditions. Normal use will not cause fading. However, direct and repeated contact with water (such as splashing during löyly) may cause mineral deposits on the surface over time. These can be wiped clean with a damp cloth when the heater is cool.

Q: Can I use this heater for an outdoor sauna?

A: Yes, but the heater itself must be installed inside the sauna room, protected from direct weather exposure. For outdoor saunas, choose a heater size 20% larger than the room volume calculation suggests to compensate for heat loss.

Q: What is the warranty?

A: Heaters include a 1-year manufacturer's warranty covering defects in materials and workmanship. Warranty does not cover damage from improper installation, misuse, or normal wear of heating elements.