Choosing a sauna heater comes down to two questions: how big is your room, and what kind of heat do you want. The heaters below cover both questions across six sub-categories - Electric Residential for home builds, Electric Commercial for spas and gyms, Wood Burning for outdoor and traditional installs, plus Rocks, Chimneys & Shields, and Replacement Parts to support what you've already got.
Sauna Heaters
The first decision: electric or wood-burning.
For indoor home saunas, electric is almost always the right call. They're code-compliant in more places, don't need a chimney, and don't ask you to manage a fire while you're trying to relax. We carry electric heaters from Homecraft, HUUM, and Harvia. If you're building indoors and want to keep the decision simple, start with our electric residential heaters.
If you're building outdoors or want the ritual of fire, wood-burning is the better fit. We stock heaters from Narvi and Leisurecraft TimberGlow, with optional water tanks and full chimney sets. Browse wood-burning sauna heaters for the full lineup.
The second decision: residential or commercial scale.
Most home saunas land between 200 and 460 cubic feet, which is what every heater on the electric residential heaters page is sized for. If you're building for a spa, gym, hotel, or shared facility, or if your room is over 460 cu. ft., you're in commercial territory and likely need three-phase power. The Homecraft Apex in 208V three-phase covers 800-1,200 cu. ft. See our electric commercial heaters for the commercial lineup.
Sauna sizing - the working rule.
Plan for 1 kW of heating power per 45-50 cubic feet of well-insulated space. Below is the chart by heater output and room volume. The match-ups reflect what HUUM, Harvia, and Homecraft publish for their own lineups.
Sauna heater sizing chart
| Heater output | Room volume | Best fit |
|---|---|---|
| 4.5 kW | 100-210 cu. ft. | Small home sauna |
| 6.0 kW | 170-300 cu. ft. | Standard home sauna |
| 7.5 kW | 300-370 cu. ft. | Larger home sauna |
| 9.0 kW | 360-460 cu. ft. | Large home or cabin sauna |
| 12 kW | 460-800 cu. ft. | Small commercial (3-phase) |
| 15-18 kW | 800-1,200 cu. ft. | Larger commercial (3-phase) |
Ranges reflect manufacturer specs from HUUM, Harvia, and Homecraft. Larger heaters cover wider ranges; manufacturers split them at slightly different thresholds.
How to calculate your room volume.
Multiply length x width x height in feet. A 5x7 sauna with a 7-foot ceiling is 5 x 7 x 7 = 245 cubic feet, which puts you in 6 kW territory.
A few adjustments before you commit to a size. Glass walls, glass doors, or windows lose more heat than wood; add roughly 15% to your volume per major glass surface. Ceilings above 7 feet add dead air the heater has to warm; size up. Outdoor cabins or uninsulated rooms also size up by about 15-25%. If you're between two sizes, go to the next one up. The price difference is small; the performance difference when you've undersized isn't.
Stones, chimneys, and parts.
The stones inside your heater do most of the steam work. More on what we stock and why on our sauna rocks page. For wood-burning installs, you'll need a sauna chimneys and shields kit sized to your heater. And if you're keeping an existing heater running rather than replacing it, our sauna heater replacement parts section covers Harvia heating elements, Leisurecraft door and firebox parts, and Homecraft WiFi upgrades. Building the whole sauna from scratch? Our material kits cover everything else you need beyond the heater. For contractors and dealers, trade pricing and account access are available on application.
Frequently Asked Questions:
I want real Finnish-style steam, which heater should I look at?
Loyly comes from stones, not from wattage. The HUUM Drop holds 55 kg (121 lbs) in a compact wall-mounted body. The Homecraft Revive tower holds 200 lbs and is built for water-pouring. Stone diameter matters too: 5 to 10 cm. Full breakdown on our sauna rocks page.
Can I run a sauna heater on a regular 120V outlet?
Almost never. Every electric sauna heater in our residential lineup runs on 240V single-phase, hardwired by a licensed electrician. The one exception is Harvia's smallest compact heater on 120V, but it only suits very small rooms (under 130 cubic feet). For any real home sauna, plan on 240V from the start.
Can I install a sauna heater myself?
You can build the sauna itself, but the electrical hookup has to be done by a licensed electrician. Voltage, breaker size, and wire gauge are specified by the manufacturer and inspected by your local authority. Every product page lists the electrical requirements your electrician needs.
Do you carry gas-fired sauna heaters?
We don't. Gas sauna heaters are uncommon in residential Canadian saunas and harder to permit in most jurisdictions. We focus on electric and wood-burning where we can offer real expertise and proper Canadian distribution. If you're specifically committed to gas, you'll need a specialist supplier outside our lineup.