Sauna Heater Size Calculator
Find the heater that fits your sauna.
Three quick questions, then every heater we carry that the manufacturer rates for your room.
Your last sauna:
How big is your sauna?
Measure the inside of the hot room, wall to wall and floor to ceiling.
Inside dimensions
ft
ft
ft
Total volume
cu ft
Room volume—cu ft
Enter length, width and height (or the total volume) to continue.
Any glass, tile or stone?
Glass and masonry pull heat out of the room. Harvia sizes them at 4 cu ft for every square foot — the door counts, the floor does not.
Glass
sq ft
sq ft
Extra volume to size for0cu ft
How is it built?
Insulated walls hold heat. Solid log and uninsulated walls need 1.5 × the volume (Harvia).
Walls
Location
Heater type
Size the heater for—cu ft
Size the heater for — cu ft
—
Checking every heater’s published range…
Before you order: confirm the electrical requirements and clearances in the manufacturer's manual and with a licensed electrician. Ranges shown are the manufacturer's published figures; a few we estimated from the heater's kW are marked. We supply the equipment — the room, the wiring and the install are yours and your contractor's, and we are not liable for a heater chosen outside its published range. Sources are on the sauna guides.
Between two sizes, or a room that isn't a box?
Call and a specialist will size it with you before you buy.