What Size Sauna Heater Do You Need?

Work out your hot room's volume, then pick a heater rated for it. Common room sizes and the heaters that fit them, with prices.

A tower heater full of stones beside cedar benches

Measure the room

Multiply the hot room's length, width and ceiling height, in feet. A 6 by 8 foot room with a 7-foot ceiling is 336 cubic feet.

Every heater maker prints the range of room volumes each heater is built for. Pick one whose range includes your room.

Leave headroom for glass and winter

An outdoor sauna in a Minnesota winter loses heat through its walls, door and windows. Choose a heater whose range your room sits in the lower half of, so it heats up quickly on a cold night. Large windows and glass doors add to the load.

4 by 6 feet, 7-foot ceiling (168 cubic feet)

6 by 6 feet, 7-foot ceiling (252 cubic feet)

6 by 8 feet, 7-foot ceiling (336 cubic feet)

7 by 7 feet, 7-foot ceiling (343 cubic feet)

7 by 8 feet, 7-foot ceiling (392 cubic feet)

8 by 8 feet, 7-foot ceiling (448 cubic feet)

8 by 10 feet, 7-foot ceiling (560 cubic feet)

8 by 12 feet, 7-foot ceiling (672 cubic feet)

Power and controls

Most electric heaters for these rooms run on 240 volts and need their own circuit, wired by a licensed electrician. Some have controls built in; others need a separate control, named on each heater's page.

A wood-burning stove needs no electrical work, but it does need a chimney kit and clearance to the walls set by its maker.

Or let us size it

Every Urban Sauna comes with a heater matched to its hot room, electric or wood-burning. Pick a model and see the heaters it takes when you design it online.

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