Large Sauna Heaters

How Do I Choose the Right Large Sauna Heater?

Selecting a heater for a large space requires precision. The primary factor is your sauna's total room volume, but you must also account for glass walls, windows, and insulation quality, as these can significantly impact power requirements.

The first and most critical step is to determine your exact power needs. Use our Sauna Heater Sizing Calculator for an accurate recommendation before you browse models.

What Kind of Heaters Are in This Category?

Heaters in the 10.5kW+ range are built for endurance and serving groups. You will find they are typically floor-standing units prized for two key attributes:

Exceptional Steam for Groups: Featuring massive stone capacities, brands like HUUM are designed to produce a rich, continuous, and soft steam that is perfect for large social saunas.

Commercial-Grade Durability: Built for constant, daily operation, brands like Harvia offer robust, service-friendly models that are trusted by gyms, spas, and hotels worldwide.

What are the Electrical Requirements for a Large Heater?

Installing a large sauna heater is a significant electrical project that must be planned and executed by a licensed commercial electrician.

Power Supply Alert: Heaters in this powerful category frequently require either a 240V 1-phase or a 208V 3-phase power supply. This is standard in commercial buildings but is not typically available in residential homes. It is essential to confirm your building's power supply with a professional before ordering.

A dedicated, high-amperage circuit and a mandatory external contactor are also standard for these units. For a general overview, you can review our guide on planning your sauna's electrical setup.

For a complete comparison of all heater technologies, read our comprehensive heater buying guide.

Shop by Specific Power Rating

10.5kW Heaters (400-600 cu ft)
12kW Heaters (400-800 cu ft)
15kW+ Heaters (800+ cu ft)