FAQs

What size heater do I need for my sauna?

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 our Heater Size Guide above to match the right heater to your space.

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

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.

What is the nest design and why choose it?

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.

Is this heater suitable for commercial use?

Absolutely. The Nest heater is available in power ratings up to 15 kW, 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.

What’s the difference between 9KW and 12.5KW/15KW models?

Models rated at 9 kW or below are designed for typical residential saunas. The 12.5 kW and 15 kW 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.

How does the Wi-Fi control work?

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.

Is the Wi-Fi system difficult to set up?

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.

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

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.

Can I install this heater myself?

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.

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

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.

Are the sauna stones included?

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 without cracking.

What electrical supply do I need?

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

Will the black finish fade or discolour over time?

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.

Can I use this heater for an outdoor sauna?

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.

What is the warranty?

Heaters include a 1-year manufacturer’s warranty covering defects in materials and workmanship. The warranty does not cover damage caused by improper installation, misuse, or normal wear of heating elements.