Sauna Heaters

Every heater manual prints a kW to room volume table. Far fewer print the adjustment you are supposed to apply to the room before you read that table, and skipping it is how heaters end up undersized. We pulled 169 of those adjustments out of 106 manufacturer installation manuals, and they are the difference between a heater that copes and one that never quite gets there.

Here is what one does. A 7 by 7 by 7 foot room is 343 cubic feet. Put a glass front on it and that 49 square feet of glass, at roughly 3.9 cubic feet of equivalent volume per square foot, adds 191. The room now sizes as 534, which is a whole heater size and sometimes two. The figure moves by brand: HUUM prints 3.3 per square foot of uninsulated brick, tile or glass, and Harvia multiplies the whole room by 1.5 for solid log walls.

Settle the electrical before the walls close. The Harvia Vega Compact runs 1.9 kW on 120V and 3.5 kW on 240V. Larger heaters need more: the Harvia Virta is 6, 8 or 9 kW on 240V single phase, and the 12 and 15 kW EOS Mythos S45 is 208V three phase.

Check what actually ships in the box. HUUM’s STEEL, CORE and CLIFF list the UKU controller and the stones as required and sold separately, and HUUM prints its room ranges already adjusted, so the DROP 2.0 covers 106 to 460 cubic feet after that math rather than before it.

From here it splits three ways: electric, wood-burning, and gas and propane.

Give us the room dimensions, the glass and the wall build at (844) 565-1113 and we will run the adjustment with you.