EOS Cubo Avantgarde 9 kW Electric Sauna Heater

The EOS Cubo Avantgarde 9 kW is a floor-standing electric sauna heater rated at 9 kW, for rooms of 50.6-79.7 sq ft at a 6.2 ft ceiling (about 314-494 cu ft). Available on 208V 3Ph or 240V 2Ph. The white quartz stone set is included; natural stones are not. It ships without controls and takes an EOS Touch 3 or EmoTec D control, sold separately.

Cubo Avantgarde is a freestanding cube, 28.3 in tall on a 15.7 × 15.2 in footprint, finished matte black on every face. What sets it apart is the rock store frame: a layer of rounded white quartz sits above the working stone fill, so the quartz is what you see. The terminal box is recessed into the body rather than bolted to the outside.

These are not included. You need them before the sauna will run.

Figures are from EOS's North America installation manual and datasheet for this heater. Breaker and conductor sizing remains your electrician's call under the NEC and local code.

The minimum distances EOS publishes for this heater. Measure before you frame the bench.

A heater guard rail is listed as an accessory and is shown in the clearance diagram. These are minimums to combustible material, not recommendations. The installation manual and your local code take precedence.

This page is the 9 kW Cubo Avantgarde. EOS rates it for 50.6-79.7 sq ft of floor area at a 6.2 ft ceiling, about 314-494 cu ft.

EOS sizes its heaters by floor area at a 1.90 m / 6.2 ft ceiling rather than by volume. Measure your floor, then add allowance for anything that absorbs heat instead of reflecting it, glass, tile, concrete, stone and exposed log all make a room behave larger than it measures. If you fall between two outputs, size up.

Other outputs in the Cubo Avantgarde range

Work out your room with the sauna heater size calculator

• EOS heaters ship without controls. The control mounts outside the hot room and switches the heater through a separate power box.
• Mount to the clearances published above.
• The cabin needs an air inlet and outlet of at least 35 x 6 cm (13.8 x 2.4 in), and an air exchange of five times the cabin volume per hour.
• Hardwired on a dedicated circuit by a licensed electrician. EOS specifies a fuse of 40 A (adjustable to 35 A) on 208V 3Ph; 20 A on 240V 2Ph, on copper conductors rated for at least 90 °C.
• Stones are not supplied. Load them loosely by hand so air moves between them, and never run the heater with an empty rock store.

EOS's North America documents for this heater. The manual carries the wiring table, the clearance diagrams and the air inlet sizes. The control is a separate product and its manual is on its own page.

• Installation and operating instructions (PDF)
• Datasheet (PDF)

What size room does the 9 kW EOS Cubo Avantgarde heat?

EOS rates this output for 50.6-79.7 sq ft of floor area at a 6.2 ft ceiling, which works out to roughly 314-494 cu ft. EOS sizes by floor area rather than volume. Add allowance for glass, tile, stone or concrete, and size up if you fall between two outputs.

What circuit does the 9 kW EOS Cubo Avantgarde need?

A dedicated circuit on the supply you choose. EOS specifies a fuse of 40 A (adjustable to 35 A) on 208V 3Ph; 20 A on 240V 2Ph, on copper conductors rated for at least 90 °C. Your electrician sizes the breaker and conductors to the installation manual, the NEC and local code.

Which control does the EOS Cubo Avantgarde need?

Either an EOS Touch 3 or an EOS EmoTec D/H (USA/CAN), EOS's North America datasheet lists both for this heater, and its installation manual names the EmoTec D/H. The heater cannot run without one. The control mounts outside the hot room, which is what lets you bring the sauna up to temperature before you walk in, and it switches the heater through a separate power box.

Are stones included with the EOS Cubo Avantgarde?

Partly. The 10 kg / 22 lbs set of rounded white quartz is listed in EOS's scope of delivery, and it is the layer you see from the bench. The natural sauna stones that fill the rock store beneath it are not included: EOS lists them under optional accessories in its North America manual, at a 50-100 mm (2-4 in) caliber. You can add a box on this page.

Is the EOS Cubo Avantgarde UL listed?

EOS publishes no UL, ETL or CSA listing for its heaters. Its North America manual requires UL 875 labelling and states that the temperatures settable from the control are tested to UL 875 or CSA C22.2#60335-1:2016 Ed.2 and CAN/CSA E60335-2-53, which is not the same as a listing. Some jurisdictions and insurers require a listed appliance, so confirm before you buy.