The Best Electric Sauna Heaters for 2027

Ben Frizzell in one of HUUM’s demo saunas in Tartu, Estonia, on August 31, 2026.

For most home saunas, get the HUUM CORE. For the most even heat in a bigger room, get the Saunum Air L. Here’s why those two are our picks for 2027, what we saw at HUUM and Saunum in Estonia, and what we’d put in every other room.

Ben Burger · Cofounder, Sauna Marketplace · October 26, 2026 · 12 min read

A sauna should be enjoyed, not endured. You should walk out feeling better than when you walked in.

The heater decides most of that. It decides how evenly the room heats, how soft the steam feels when you throw water, and whether your feet stay cold while your head cooks. Pick the right one, size it to your room, and the whole sauna gets better. Pick the wrong one and no bench, wood or light will save it.

We know what works from running SaunaShare and from working with commercial bathhouse operators since 2018. Both of us have a steady rotation of heaters at home, too. We try it and love it before we sell it.

So here’s what we’d tell a friend. For most home saunas, get the HUUM CORE. If you want the most even heat in a bigger room, get the Saunum Air L. Everything else on this page is for the rooms those two don’t fit.

Our picks for 2027

• HUUM CORE: best for most home saunas, 177 to 566 cubic feet.
• Saunum Air L: the most even heat in a bigger room, 283 to 812 cubic feet.
• HUUM DROP: best value for small and mid-size rooms, from 106 cubic feet.
• Saunum Air 5 and 7: Saunum’s even heat for 106 to 318 cubic feet, control and stones included.
• Harvia KIP: simple and affordable, with the controls on the heater (B models).
• Harvia Virta Combi: a built-in steamer for softer, more humid sessions.
• Homecraft Revive: Canadian-made and built like a tank.
• Harvia Vega Compact: the one 120-volt heater we sell, for the smallest rooms.

Want to see it before you buy it? SaunaDesignPro, our free 3D sauna planner, has the CORE and the Air L. Draw your room, drop in the heater, and it sizes the heater to your room. Wood-burning stoves are over here.

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Best for most home saunas: HUUM CORE

The HUUM CORE with a wood exterior.

If you’re building one sauna and want to get it right the first time, this is the heater we’d put in it.

The CORE is HUUM’s square floor-standing tower: about 15 inches on a side and 33 inches tall, stones on top. Pick a wood exterior in alder, aspen or Thermo-Aspen, black, or a customizable version you finish yourself in tile, stone, glass or wood.

• Why we’d pick it: It looks like part of the room instead of an appliance in the corner. Match it to Thermo-Aspen walls and it disappears into the sauna. The wood panels help keep bare skin off hot metal, and it needs only 2 inches of clearance on each side, so it tucks in close to a wall or bench.
• Who it’s for: Most home saunas. 6.5 kW covers 177 to 318 cubic feet, 9 kW 283 to 460, and 10.5 kW 354 to 566. That’s anything from about 5 by 6 feet up to 8 by 10 with a 7-foot ceiling.
• Know before it ships: It runs on HUUM’s UKU control, sold separately; the Wi-Fi version lets you start the sauna from your phone. HUUM wants a room at least 80 inches tall and 43.3 inches from the top of the heater to the ceiling. Your electrician will need a 30 amp breaker for the 6.5 kW or 50 amps for the 9 and 10.5 kW, at 240 volts.

The one thing the CORE isn’t: a small-room heater. Nothing in the family goes below 177 cubic feet. For a smaller room, jump to the HUUM DROP.

See the HUUM CORE →

The most even heat: Saunum Air L

The Saunum Air L with the stainless open basket.

If you’ve ever sat on a top bench with a hot face and cold feet, this is the fix.

Every sauna stratifies. Hot air rises to the ceiling and cool air pools at the floor. Set a traditional sauna to 176°F and Saunum’s own measurements put it at about 226°F at head height and about 81°F at your feet. That’s why so many people call a sauna “too intense” and leave early.

Saunum’s answer is a fan inside the heater. It pulls the hot layer down off the ceiling, blends it with cooler air from the floor and sends it back out low, where you sit. In the same measurements the room ran about 196°F up top and 149°F at the floor. Two thirds of the gap, gone. The lower bench stops being the lesser bench. One of us runs a Saunum at home.

• Why we’d pick it: Even heat from head to toe, and a lot of stone behind it: 180 pounds in the black closed basket or 190 in the stainless open basket. It’s Saunum’s commercial-grade heater.
• Who it’s for: Bigger rooms, 283 to 812 cubic feet, in 10, 13 or 15 kW. A family sauna that runs most nights, a big outdoor sauna, a gym, a rental or a bathhouse.
• Know before it ships: It needs a 240-volt breaker of 50 amps for the 10 kW, 70 for the 13 and 80 for the 15, and it can’t go on a GFCI breaker. It runs only with Saunum’s AirIQ control, and the AirIQ and stones are sold separately. It tops out at 194°F.

Room under 283 cubic feet? The Saunum Air 5 and 7 do the same blending for 106 to 318 cubic feet, and their price includes the AirIQ and stones.

See the Saunum Air L →

The rest of our list, side by side

Room sizes are each maker’s rating for adjusted volume. Here’s how to size your room.

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What we saw in Estonia

We know our manufacturers by first name. Between August 31 and September 10, 2026, Ben Frizzell and I visited sauna and heater makers across Estonia and Finland, HUUM and Saunum among them.

One of the demo saunas at Huumimaa, HUUM’s demo park in Tartu.

HUUM was our first stop, in Tartu. We talked so much at HUUM that we nearly ran out of time for the saunas: heaters, ideas, and what people ask us back home. It seemed every suggestion we had was already being worked on.

We did make it outside to Huumimaa, HUUM’s demo park. Cube saunas, a round-windowed garden sauna, a plastered cave sauna and a cold plunge that Ben Frizzell had to try on for size. HUUM heaters were everywhere, next to plenty of sauna brands we already work with. That’s the Estonian way: the makers value cooperation over competition, and you feel it. We’re HUUM trained, too, with the Learning Hub badge on HUUM’s dealer page.

A week later we walked the heater line and test labs at Saunum in Tallinn. The steel is Magnelis, a zinc-aluminum-magnesium coating with three times the corrosion protection of galvanized. The heating elements are visibly thicker than the ones we’re used to seeing. The contactor boxes are built like industrial gear.

Saunum runs three test labs under one roof: one is UL-validated, and another has movable walls and hundreds of data loggers that map how heat and air move through a sauna. The whole story is in Inside the Saunum heater factory.

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For smaller rooms

HUUM DROP

The DROP is HUUM’s round rock-basket heater and the best value in the lineup. Four sizes run from 4.5 kW (106 to 248 cubic feet) to 9 kW (283 to 460), with about 121 pounds of stones for soft steam, on the same UKU control as the CORE. Plan a room at least 75 inches tall. Harvia’s Spirit takes a similar approach; here’s how the two compare.

Harvia KIP

The KIP is about as simple as a good heater gets. On the B models the controls are on the heater, so there’s no separate panel to buy or mount; the W models take a wall control. The 4.5 kW covers 100 to 210 cubic feet, the 6 kW 170 to 300 and the 8 kW 250 to 425. Harvia also sets a minimum floor area, 16 square feet for the 4.5 kW, so check both numbers.

Saunum Air 5 and 7

The 5 kW covers 106 to 212 cubic feet and the 7 kW 177 to 318, in a black closed basket or a stainless open basket. If you want Saunum’s even heat in a compact home sauna or a barrel, start here.

For steam on demand: Harvia Virta Combi

The Virta Combi pairs a regular heater with a 2.1 kW built-in steamer, so the same room can run as a classic hot sauna or a softer, more humid one. It comes in 8, 9 and 10.5 kW for rooms from 177 up to 635 cubic feet, on Harvia’s Xenio CX30C-U1 control, sold separately.

Built like a tank: Homecraft

Homecraft builds its heaters in Canada. The Revive holds up to 200 pounds of rock in a tower built for people who throw a lot of water and like a wetter sauna. We think it’s the heater most likely to be passed down to the next generation. The Revive Slim brings the same idea to rooms from 100 cubic feet.

We’ve also used Homecraft’s Apex, the commercial line, from 10 to 18 kW. Every Homecraft heater needs a contactor box and a touchpad, sold separately.

Bathhouses and commercial saunas

Commercial saunas are where we’ve learned the most, a lot of it the hard way. Above about 560 cubic feet the list gets short: the Saunum Air L up to 812 cubic feet, HUUM’s HIVE up to 989 (on two circuits), Homecraft’s Apex up to 1,150, and Harvia’s Virta Pro and Club.

Two lessons from the bathhouse side. In a sauna that runs all day, heating elements wear out, so plan for it and keep a spare set on the shelf. And keep the top of the stones low relative to the top bench, so a full room gets even heat. We put the rest in our video on commercial sauna heaters.

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Are more stones better?

Usually, with one tradeoff. More stones take longer to heat. Once they’re hot, the room feels softer and you get more steam every time you throw water.

A heater with fewer stones heats faster. In a small room that heat can feel harsh, like a blow dryer in your face.

The best of both is a heater with plenty of stones and a Wi-Fi control. Start it from work or from bed, and the extra warm-up time stops mattering.

Where the stones sit matters too. Good sauna design keeps your feet near or above the top of the stones. Bench and footrest heights do most of that work, and some heaters can be embedded in a raised bench or platform to help.

What about a 110-volt or 120-volt sauna heater?

For almost every sauna, no. Most saunas need a 240-volt circuit, and no electric sauna heater plugs into the wall. Every one we sell is hardwired by a licensed electrician.

The exception is the Harvia Vega Compact 1.9 kW, which runs on 120 or 240 volts. At 120 volts it draws 15.9 amps and heats a room from 70.5 to 106 cubic feet. That’s a very small sauna, about 4 by 4 feet with a 6.5-foot ceiling. It’s still hardwired, and Harvia says not to connect it through a GFCI. The 3.5 kW Vega Compact is 240 volts only, for 70.5 to 175 cubic feet.

HUUM or Harvia?

Honestly, we can’t imagine a world without both, and luckily we don’t have to. To us it’s not HUUM vs. Harvia. It’s HUUM + Harvia.

HUUM is Estonian, and its electric heaters carry a lot of stone for their size; the CORE adds a finished exterior. Harvia is Finnish and makes one of the broadest ranges in sauna, from the KIP with its built-in controls to the Virta Combi’s steamer and big commercial heaters. See them all on our HUUM and Harvia pages.

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How to size your heater

Start with the inside of the room: length times width times height, in feet. A 6 by 7 foot room with a 7-foot ceiling is 294 cubic feet.

Then add for cold surfaces. Glass, tile, brick and stone soak up heat, so each heater maker adds volume for them: 3 cubic feet per square foot for Saunum and 3.3 for HUUM. A 2 by 6.5 foot glass door adds about 40 cubic feet. Uninsulated log walls count for more; Saunum multiplies the whole room by 1.5.

If you land between two sizes, take the bigger one. An undersized heater runs flat out and still never gets the room where you want it.

Our sauna heater calculator does this math for each brand. SaunaDesignPro does it as you design the room, and for HUUM there’s our HUUM sizing guide.

Questions we hear

What’s the best electric sauna heater for 2027?

For most home saunas from 177 to 566 cubic feet, the HUUM CORE. For the most even heat in a room from 283 to 812 cubic feet, the Saunum Air L.

What’s the best heater for a small sauna?

The Harvia KIP 4.5 kW starts at 100 cubic feet and the HUUM DROP 4.5 kW at 106. Below that, the Harvia Vega Compact starts at 70.5.

Can I plug a sauna heater into a regular outlet?

No. Electric sauna heaters are hardwired by a licensed electrician, even the 120-volt Vega Compact.

Do I need a separate control?

Usually. HUUM heaters run on the UKU, Saunum on the AirIQ, the Virta Combi on Harvia’s Xenio, and Homecraft on its own touchpad. The Harvia KIP B models and the Vega Compact have their controls built in.

Send us your room

We’ve seen a lot of mistakes sizing heaters, and getting it right is the part we’d most like to help with. Send us the room’s inside dimensions, the glass and how the walls are built, and we’ll tell you what we’d put in it. That’s the whole idea behind Sauna Marketplace: if your best friend was a sauna expert.

Adding a cold plunge? Here are our cold plunge picks for 2027. Or see every electric sauna heater we carry.