Free Delivery · 1–2 Yr Warranty · After-sales Support
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.
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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.
### 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
- RonYen 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
If an electrical item stops working within the warranty period, we’ll send you a replacement free of charge.
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 RonYen Sauna if you notice any unusual operation
For detailed care instructions, visit ronyen.com/support
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Outdoor saunas are fully weather-sealed for gardens, rooftops and pool decks; indoor models are built for bathrooms, gyms and spare rooms. Both use indoor-rated electric heaters.
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We soft-open on 30 July 2026 in Chonburi (with Founding Member pricing) and fully open on 4 September — and booking is open now, so you can reserve a session ahead. Book a visit.
The Garden runs on advance bookings so every session has the space to itself — so book ahead if you can. That said, if you're passing and spot us, scan the sign at the gate or give us a call, and if there's room in the current session we'll happily wave you in.
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The Wellness Garden is in Chonburi, easily reached from Bangkok and Pattaya. Full directions and parking details are on the garden page.
Yes — most saunas assemble in a day with two or three people and clear instructions. Prefer it done for you? Our team can handle the full install. Installation service.
Delivery to the spot, full assembly, levelling, heater fitting and a handover walkthrough so it’s ready to use the same day.
A firm, level base — a concrete pad, deck or paved area — plus a nearby power point. We’ll send a simple prep checklist before delivery.
Final connection should be made by a licensed electrician. We provide the full specification and can recommend trusted local contractors.
Yes — we deliver right across Thailand by freight, and ship internationally on request. Delivery details.
Most saunas are ready six to eight weeks from order. Once built, freight to your address typically takes a few days, with tracking provided.
Standard nationwide delivery is included. For tricky access — rooftops, tight lanes or upper floors — we’ll quote any crane or extra handling up front.
Everything ships in a purpose-built timber crate to protect the timber and glass in transit — and the crate is easy to dispose of or repurpose.
Get a straight answer on what suits your space, budget and the Thai climate — free and with no pressure.
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A sauna or ice bath is a long-term addition to your home or commercial space. Tell us about your project, your goals and your timeline — we’ll give you a straight answer, including what the right options are.
Free consultation. Phone call, video call, or visit our showroom in Ban Suan, Chonburi — Rön Yen Shop & Wellness Garden — by appointment. Tell us your space and budget, and we’ll talk through the options with no pressure to buy.
Ban Suan, Chonburi — 10 minutes from Central Chonburi
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