Self Care Saunas

Heater calculator

Size an electric heater or wood stove from interior volume, then extra for glass and uninsulated walls. Results update as you type. Infrared panels are listed separately and are not mixed in here.

01

Room size

Use interior length, width, and ceiling height. If you already know cubic feet, enter that instead.

Units
Heater type
02

Cold surfaces and insulation

Glass doors, windows, tile, brick, concrete, stone, and uninsulated walls add heat loss. The floor is not a cold surface — leave it out. A typical full glass door is about 21 sq ft.

Room construction
03

Brand, if you have one

No preference still uses Harvia-style cold-surface guidance, which is the published allowance most of our electric lines share. Infrared panels are not mixed into these results.