Finnleo Magma 28.8 kW (208V 3PH) Sauna Heater

The Finnleo Magma 28.8 kW (208V 3-Phase) is the top-of-the-line, commercial-grade electric sauna heater in the Magma family, engineered for the largest traditional sauna rooms and the most demanding commercial applications. As the most powerful heater Finnleo offers, this floor-standing unit is sized for sauna rooms from 1,550 to 2,000 cubic feet, making it the correct choice for large spas, hotel and athletic-facility saunas, and any oversized room where lower-output heaters cannot deliver fast, even, sustained heat.

Manufactured by Sauna360 under the Finnleo brand, the Magma 28.8 kW pairs a high-capacity heating element with a large rock bed to produce the deep, penetrating heat and abundant löyly (steam) that define an authentic Finnish sauna experience, even at commercial scale and continuous-use demand.

Key Features

• Commercial floor-standing heater with approximately 198 lb rock capacity
• Sized for sauna rooms from 1,550 to 2,000 cubic feet
• 28.8 kW output on a 208V, 3-phase electrical supply — Finnleo's highest-output heater
• Rugged stainless-steel outer shroud built for continuous commercial use
• Pairs with the SaunaLogic2 (SL2-C) commercial control system
• Remote control installation capability — mount the control panel outside the sauna room
• Door switch (interlock) compatibility for automatic shut-off and energy management
• Programmable temperature and run-time settings
• Optional external, low-voltage on/off switch
• Sauna stones included
• Available as Heater Only or as a complete bundled package

Construction & Build Quality

As Finnleo's flagship commercial heater, the Magma 28.8 kW is built as a rugged, floor-standing unit rather than the compact wall-mounted heaters found in Finnleo's residential Designer SL2 line. Its stainless-steel outer shroud is engineered to withstand sustained exposure to extreme heat, moisture, and steam under heavy, continuous commercial use. Internally, the heater is designed for high-output reliability and is frequently specified in multi-heater configurations for very large sauna rooms that exceed the capacity of a single unit. All Finnleo heaters are ETL listed, meeting recognized safety standards for installation throughout the United States and Canada.

Rocks & Heating Performance

The Magma 28.8 kW holds approximately 198 lbs of high-quality sauna stones, providing substantial thermal mass that absorbs and radiates heat evenly across very large sauna volumes, eliminating cold spots even in rooms approaching 2,000 cubic feet. When water is ladled onto the hot stones, the large rock bed produces the soft, plentiful löyly (steam) central to traditional Finnish sauna bathing. To maintain optimal airflow and performance, stones should be inspected and repositioned roughly once a year — more frequently under heavy commercial use — with full replacement recommended every 2-5 years depending on usage intensity.

SaunaLogic2 (SL2-C) Control System

The Magma 28.8 kW is matched with Finnleo's SaunaLogic2 SL2-C control, purpose-built for high-use commercial and multi-heater sauna environments. Its features include:

• Sleek digital touchscreen interface for clear temperature display and adjustment
• Remote installation capability — the control unit can be mounted outside the sauna room so bathers cannot alter preset temperature or run-time limits, ideal for commercial or shared-use settings
• Programmable run time and temperature settings for predictable, energy-conscious operation
• Door switch integration — the heater automatically shuts off if the sauna door is opened and left open, supporting both safety and energy efficiency
• Optional external, low-voltage on/off switch for added convenience

Electrical & Contactor Box Requirements

The 208V, 3-phase configuration of the Magma 28.8 kW requires both a CB 17-3 and a CB 18-3 contactor box working together to safely bridge the low-voltage SL2-C control with the heater's high-power circuits. This dual contactor box setup is specific to 208V 3-phase Magma installations (the 480V 3-phase version of this same heater requires only a single CB 17-3). A separate 120V supply is also required to power the control box itself. Given the significant power draw of this top-tier commercial heater, installation must be performed by a qualified, licensed electrician in strict accordance with the heater's installation manual, ensuring correct breaker sizing and wire gauge for a safe, code-compliant setup.

What's Included

• Finnleo Magma 28.8 kW heater unit
• Approximately 198 lbs of sauna stones
• Temperature sensor
• SaunaLogic2 (SL2-C) control unit (on bundled packages)
• CB 17-3 and CB 18-3 contactor boxes (both required for 208V 3-phase operation)
• Installation and operation manuals
• Factory warranty

Choose Heater Only if you already have a compatible SL2-C control and contactor boxes, or select a complete package that bundles the control and the correct pair of contactor boxes for your 208V 3-phase electrical setup. Sauna stones are included on every option.

Installation & Usage Notes

The Magma 28.8 kW is a floor-standing heater intended strictly for large traditional (non-infrared) sauna rooms and commercial installations — it is not designed or sized for small residential saunas, where it would produce excessively rapid, uneven heating. Proper room construction, insulation, and ventilation are essential to safe, effective operation at this power level. The heater requires a 208-volt 3-phase electrical supply plus a separate 120-volt supply for the control box; professional installation by a certified electrician is mandatory to ensure correct breaker sizing and wire gauge. Routine maintenance is minimal: reposition sauna stones roughly once a year (more frequently under heavy commercial use) to preserve proper airflow, replace stones every 2-5 years as needed, and wipe down the stainless-steel exterior with a damp cloth using only clean water on the heater — never pool water or chlorinated water.

Why Buy Finnleo from Us

Finnleo, built by Sauna360 in Cokato, Minnesota, is one of the most trusted names in authentic Finnish sauna. Every heater is safety-tested and ETL listed for North America, and the SaunaLogic2 ecosystem ties your heater, lighting, and controls into one cohesive, app-ready experience. We are an authorized Finnleo dealer offering full factory warranty coverage (1-year commercial / 5-year residential), expert sizing help, and support before and after your purchase. Have a question about fit, voltage, contactor boxes, or lead time? Reach out and a sauna specialist will help you spec it correctly the first time.