Free Delivery · 1–2 Yr Warranty · After-sales Support
The Black Prism is our premium sauna heater, featuring a sleek tower design with clean geometric lines. This sophisticated heater combines modern aesthetics with exceptional heating performance, making it the centrepiece of any high-end sauna installation.
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Standing 80.5cm tall with a compact 31 x 31cm footprint, the Prism heater fits elegantly into corner installations whilst its vertical profile creates visual impact. The enclosed design provides a clean, minimalist appearance, whilst the internal stone chamber delivers high-quality steam production.
Built with heavier-gauge construction (20.5kg without stones), the Prism is engineered for demanding use and long service life. The matte black finish complements contemporary sauna interiors, particularly those featuring dark timber, stone accents, or modern minimalist design.
This heater includes Wi-Fi connectivity for smartphone control, plus 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.
Choose from four power options to match your sauna room size. All of our sauna heaters are TÜV Safety Certified.
Delivery
Free delivery throughout Thailand. Standard delivery timeframe is 3–6 weeks from order confirmation.
Heater, controller, Wi-Fi adapter, and stones ship separately (2 boxes total). Delivery to the ground floor or building loading dock. Stairs or lift access may incur additional handling fees.
Installation
Professional electrical installation required. The heater must be hardwired to a dedicated circuit by a licensed electrician.
The Prism heater can be floor-mounted or wall-mounted, depending on your sauna layout. The compact footprint and tall profile suit corner installations. Maintain a minimum 40cm clearance between the top of the heater and the ceiling.
The external controller requires a small hole through the sauna wall for the cable connection. Your electrician or installer can drill this during setup.
RonYen Sauna provides installation guidance but does not install standalone heaters. We recommend hiring a local electrician familiar with high-amperage appliance installation.
Wi-Fi setup is simple. The adapter plugs into the controller, connects to your home Wi-Fi network, and pairs with the app in minutes. No technical expertise required.
Installation typically requires:
Dedicated electrical circuit (30–40A 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 ceiling clearance (minimum 40cm above heater)
If an electrical item stops working within the warranty period, we’ll send you a replacement free of charge.
Outdoor and indoor cabins, barrels, cylinders and sauna + shower combos — from a compact one-person unit up to ten-person commercial rooms, all customisable to your space. Browse saunas.
Western Red Cedar and Finnish Thermo Pine both handle heat and humidity beautifully; Hinoki is our premium pick. We’ll match the timber to your budget and location.
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.
Most home saunas run on a dedicated single- or three-phase circuit sized to the heater. We’ll confirm the exact electrical requirement in your quote.
Both are food-grade and corrosion-resistant; 316 adds extra protection for coastal and chlorinated environments. We recommend the right grade for your site. See ice baths.
Ice works to get started, but a chiller holds a precise temperature day after day with no effort — the easiest way to make cold therapy a daily habit.
Our chillers take the water down to around 3°C and hold it there. Most people plunge between 3–10°C depending on experience.
A built-in filtration and sanitation cycle keeps the water fresh for weeks. We’ll walk you through simple water care at handover.
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.
Saunas, ice baths, a swimming pool and shaded lounge areas — everything you need for the full hot-and-cold circuit. Explore the garden.
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.
Book a free consultation
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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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