Differences Between Finnish Sauna, Bio Sauna, Infrared Sauna, and Hay Sauna on Yachts

Many yachts are equipped with different types of saunas, but often neither the crew nor the owner fully understands the technical specifications and operating modes of each model. Accurately identifying the type of sauna installed is essential to set the correct temperature, avoid misuse, reduce the risk of faults, and understand long-term maintenance requirements.

This guide provides a clear overview to help you recognize the various types of saunas on board and manage them properly.

 

1. Finnish Sauna (Traditional Sauna)

The Finnish sauna is the most well-known type and has the following characteristics:

  • Temperature: 90–100°C (194–212°F)
  • Humidity: low (<20%)
  • Heater: electric (380V) with stones
  • Heating: dry, very hot air
  • Recommended use: 10–15 minutes

This type of sauna heats up quickly and is ideal for yachts with a well-insulated, fully enclosed cabin. When using a Finnish sauna on board, it is important to regularly check the stones, ensure efficient ventilation, and keep the door fully closed during use in order to achieve optimal performance and even heat distribution.


2. Bio Sauna (Medium-Temperature Sauna)

The bio sauna offers a milder experience compared to the Finnish sauna and is characterized by:

  • Temperature: 50–60°C (122–140°F)
  • Humidity: medium (30–55%)
  • Heater: special heater with internal evaporator / generator
  • Experience: softer, more humid heat

The bio sauna is particularly comfortable for guests who prefer moderate temperatures. However, it requires additional care: the evaporator must be properly maintained and, due to the higher humidity level, the risk of mold increases. For this reason, efficient ventilation is essential to preserve the cabin and ensure safe long-term use.


3. Infrared Sauna

Unlike traditional saunas, infrared saunas do not heat the entire cabin, but instead warm the body directly through infrared radiation. Key features include:

  • Cabin temperature: 40–60°C (104–140°F)
  • Humidity: very low
  • Heater: infrared panels (no stones, no steam)
  • Heating: direct heating of body tissues

This type of sauna stands out for its low energy consumption and the speed at which it warms the body, as well as for its simpler installation. However, it is important to note that the heat produced is different from that of a traditional sauna. The infrared panels must be securely fixed to withstand yacht vibrations and protected from impacts that could damage them.


4. Hay Sauna

Less common on yachts but increasingly popular on superyachts, the hay sauna has the following characteristics:

  • Temperature: 45–55°C (113–131°F)
  • Humidity: high (50–70%)
  • System: hot steam generator + natural hay
  • Experience: moist, enveloping heat with aromatic scents

This type of sauna is ideal for those seeking deep relaxation, thanks to the natural fragrances of hay and essential oils and the more comfortable temperatures compared to traditional saunas. Care must be taken to ensure that the hay is always dry and of high quality, that an effective humidification system is in place, and that Finnish-style heaters are not used, as their dry, intense heat could damage the hay and compromise the experience.

 

How to Identify Which Sauna You Have on Board

You can determine the type of sauna installed by checking:

  • the manual provided by the shipyard
  • the presence or absence of stones
  • the type of display
  • the type of generator (heater, steam, or infrared panels)
  • the expected humidity level
  • or by contacting Centro Italia Yachting

 

Technical Assistance and Spare Parts for Yacht Saunas

For any technical assistance or spare parts for your sauna on board, you can rely on Centro Italia Yachting. For Italy, the toll-free number 800 931 931 is available, while from abroad you can contact +39 327 612 0605.