Harvia vs HUUM Sauna Heater: kW Sizing, 240V Wiring and Four Numbers for One Machine

Disclosure: This article contains affiliate links, and I earn a commission if you buy through them at no extra cost to you. I have not installed, wired or used any of these heaters. Everything below is the manufacturers’ and their US distributor’s own published figures, which I fetched on 31 August 2026 and re-checked on 14 September 2026, plus arithmetic you can redo on a phone. Every US price below was identical on both dates; the Japanese list prices were not, and I show both. Where a number is my estimate or my inference, I label it.

There is a HUUM Drop hanging on a wall somewhere in Ohio that is a 9 kW heater. There is an identical-looking Drop in a Tokyo bathroom that is a 6.4 kW heater. Same model name, same stainless shell, same 55 kg of stone. HUUM publishes both figures, plus two more — 8.5 kW and 6.75 kW — for the same product in two other markets.

That’s not a misprint, and once you see why, most of the confusion in this category evaporates. So this is a sizing and wiring guide rather than a beauty contest. Harvia and HUUM both make good steel boxes full of hot rocks. What decides which belongs in your room is arithmetic: cubic feet, kilowatts, amps, and the four-figure electrician’s quote neither company puts on a product page.

Who This Guide Is NOT For

• If you haven’t decided on the room yet, this is the wrong article. A heater is the last decision, not the first. My home sauna comparison covers barrels, precut kits and infrared cabins, and plenty of people shopping for a 9 kW heater are better served by a plug-in infrared cabin.
• If you want a plug-in appliance. Every heater here is hardwired to a dedicated 240 V circuit by a licensed electrician. There is no 120 V version of any of them: 6 kW on 120 V would be a 50 amp draw.
• If you’re choosing on looks alone. HUUM wins that on most people’s scorecards. But the Drop costs roughly twice what the equivalent Harvia does once the required control unit is in the basket, and you should know that before you fall in love.
• If you have a heart condition, uncontrolled blood pressure, or you’re pregnant. Heat exposure at 80–100°C is a real cardiovascular load. I compare hardware; a doctor clears you for it.

Step One: The Only Sizing Formula You Need

Harvia publishes a sauna volume calculator on its own site. The page is JavaScript, so I read the script that runs it. Here’s what the code actually does — the single most useful thing in this article:

Effective volume (m³) = width × height × depth

• × 1.5 if the walls are solid log
• + 1.5 m³ if there’s a glass door
• + 1.2 m³ for every square metre of uninsulated wall (glass, tile, brick, concrete, stone)

Then: heater kW = 0.7 × effective volume, with a floor of 2.3 kW and a ceiling of 30 kW.

In feet and inches, doing the conversions myself:

Effective volume (ft³) = W × H × D in feet, × 1.5 for log, + 53 ft³ for a glass door, + 3.94 ft³ per square foot of uninsulated surface. Then divide by 50.4 to get kilowatts.

Sit with that 0.7, because the internet will tell you the rule is “1 kW per cubic metre.” Harvia’s own code says 0.7, and its published product ranges agree: the KIP-60 is 6 kW rated to a maximum 8.5 m³ (6 ÷ 8.5 = 0.71), the KIP-80 is 8 kW to 12 m³ (0.67), the Cilindro PC70 is 6.8 kW to 10 m³ (0.68). Three products, one constant.

Now the worked example, because the adders matter more than the room does. Take a typical North American indoor build: 6 ft × 7 ft floor, 7 ft ceiling.

• Bare insulated room: 294 ft³ ÷ 50.4 = 5.8 kW. Buy a 6 kW.
• Add a glass door: 294 + 53 = 347 ft³ = 6.9 kW. You’re now shopping 7.5–8 kW.
• Add a 4 ft × 7 ft glass wall (28 ft² × 3.94 = 110 ft³): 457 ft³ = 9.1 kW.

The room never changed. The glass took you from a 6 kW heater on a 30 amp breaker to a 9 kW heater on a 50 amp breaker — several hundred dollars of copper before you’ve bought the heater. If you’re planning a glass front, and most attractive home saunas in 2026 have one, do this sum before anything else.

Where the Cold-Surface Adder Falls Apart

The first genuine contradiction is between two Harvia-branded documents. Harvia’s online calculator adds 1.2 m³ per m² of uninsulated surface, which is 3.94 ft³ per square foot. A Harvia-branded PDF titled Sizing Your Harvia, distributed by US dealers, walks the buyer through the same three steps and instructs: “For each square foot of cold surface materials (excluding door), an additional 2 cubic feet must be added.” Two cubic feet, against Harvia’s own calculator’s 3.94 — very close to half. HUUM’s US Drop manual uses a third figure: “an additional volume of 53 ft³ (1,5 m³) … for each such square meter of the wall,” or 4.9 ft³ per square foot.

Run my 28 ft² glass wall through all three and the adder is 56, 110 or 137 ft³. On a 294 ft³ room, that’s the difference between specifying a 7 kW heater and a 9 kW one. I can’t adjudicate which document is right, but the asymmetry is obvious: an oversized heater costs you a bigger breaker, while an undersized one never reaches temperature on a January evening and can’t be fixed later. Use the biggest adder.

One trap: Harvia’s 1.5 m³ is a flat charge for a glass door, HUUM’s 1.5 m³ is per square metre of glass wall. Same number, different meanings. Don’t blend the two systems.

The Core of It: One Heater, Four Power Ratings

I pulled HUUM’s Drop specs from four of its own sources on 31 August 2026.

Those four rows come from, in order: HUUM’s US Drop manual Table 2; the same manual’s Table 3; huum.eu’s spec table; and the Japanese distributor’s listing, whose product title reads, in translation, “DROP 9 Electric Sauna Stove, single-phase 200 V, 6.4 kW.”

It’s one set of heating elements. Resistive elements obey P = V²/R, so power scales with the square of supply voltage — and that single equation reproduces every number above to within 3%:

• 8.5 kW at 230 V, run at 240 V: 8.5 × (240 ÷ 230)² = 9.25 kW. HUUM calls it 9.
• 9 kW at 240 V, run at 208 V: 9 × (208 ÷ 240)² = 6.76 kW. HUUM says 6.75.
• 8.5 kW at 230 V, run at 200 V: 8.5 × (200 ÷ 230)² = 6.43 kW. Japan says 6.4.

Nothing is wrong here. HUUM is being unusually honest by publishing the derated tables at all — most brands publish the flattering number and stop. But the consequence is severe:

If your building is 208 V, a “9 kW” Drop is a 6.75 kW heater. You lose 25% of the power and roughly a third of the room. HUUM’s own 208 V table drops the Drop 9 from 15 m³ to 11 m³. Buy the 9 kW for a 13 m³ room on 208 V service and you’ve installed a heater the manufacturer doesn’t rate for that room — in the same manual that says “the producer’s warranty guarantee is invalid if the heater and sauna room have been dimensioned incorrectly.”

Two hundred and eight volts is not exotic. It’s the standard single-phase leg of a 120/208 V three-phase wye service, which is what a large share of American apartment buildings, condos, converted warehouses and small commercial units run on. Before you buy any heater in this article, put a meter on the two hot legs of the circuit you intend to use. It takes ten seconds and it changes which heater you should own. Harvia is in the same boat — its US catalogue lists separate 208 V three-phase SKUs of the Club and KIP lines for exactly this reason.

Where the Published Numbers Contradict Each Other

I went looking for spec conflicts the way I did with cold plunge chillers, and this category delivers.

1. HUUM’s manual and HUUM’s website disagree on three of the four Drop models.

Do the division and the pattern is clean. The website’s maxima work out to 0.64–0.69 kW per m³ — right on Harvia’s constant of 0.7. The manual’s maxima work out to 0.60–0.64, a consistently more generous rating, and US retailers have overwhelmingly copied the manual, so the number you see while shopping is the larger one. Given that mis-dimensioning voids the warranty and HUUM publishes two definitions of “correctly,” build to the website’s smaller figure. A 9 kW Drop in a 13 m³ room, not a 15 m³ one.

2. One retailer’s page contradicts itself, twice. On Select Saunas’ Drop 9 page on 31 August 2026, the prose reads “For Saunas From 247 to 424 ft³ / 7 to 12 m³” — those are the Drop 7.5’s numbers — while the spec box further down the same page reads 282–530 ft³. On the Drop 7.5 page, the spec box says 230–441 ft³ while the comparison table lower on that same page says 247–424 ft³; 230–441 appears in no HUUM document I could find. The Hive Mini 9 page does the same: spec box 282–530, comparison table 317–530.

3. A 6 kW heater listed at 37.5 amps. The Harvia Cilindro PC60E is a 6 kW, 240 V, single-phase heater. Six thousand watts divided by 240 volts is 25.0 amps. Its Select Saunas listing states “Nominal Amps: 37.5 Amps,” which is the PC90E’s figure, and its “Shipping Weight with Sauna Stones” is identical to the PC90E’s too. It’s a copy-paste, and it’s the kind that ends up in an email to an electrician. Harvia’s own KIP manual and HUUM’s own Drop manual both list 25.0 A for their 6 kW models, on a 30 A breaker with 10 AWG wire. Use that.

4. Stone capacity is overstated by about 10%. Every US Drop listing I read says “132 lbs / 60 kg.” HUUM’s own spec tables — US site and EU site — say 55 kg, as does the Japanese distributor. HUUM’s US manual tells you to plan the wall mount for a total loaded weight of 143.3 lb (65 kg), which with a 24 lb heater leaves about 119 lb of stone. Buy 55 kg, not 60.

5. The documents that would settle all of this are gone. Those retailer spec tabs link to a “Data Sheet” and a “Warranty Sheet” hosted by the US distributor. I checked nine of those PDF links on 31 August 2026. All nine returned HTTP 404, though the distributor’s homepage loads fine.

I’m not alleging bad faith — stale templates and a site migration explain all of it. But no single published document here is internally consistent, so hold the conservative reading of each one and build to that.

The Cost Nobody Quotes: The Control Unit

This is the biggest structural difference between the brands, and it’s invisible in a price comparison of heaters.

Every HUUM electric heater requires a separate UKU control unit. There is no built-in-thermostat model in the range.

Harvia sells both kinds. Models ending in “B” or “W” — KIP45B, KIP60B, KIP80B, the Cilindro PC60/PC80/PC90, The Wall SW60/SW80 — have the thermostat and timer on the box. The “E” models (PC60E, PC90E, HL90E) need an external Xenio controller, same as HUUM.

So the honest 6 kW comparison, all prices fetched from Select Saunas on 31 August 2026:

$1,447 of difference for the same 6 kilowatts on the same 30 amp circuit. That’s the number to hold in your head. The Drop is a beautiful object with roughly three times the thermal mass in stone, and stone mass is genuinely what makes löyly soft rather than sharp. Whether that’s worth $1,447 is a question about you, not about engineering.

Check the current price on the HUUM Drop 6 kW at Select Saunas

On pricing honesty, since I checked five dealers the same day: prices here are effectively fixed. The Drop 6 was $1,506 at both Select Saunas and The Sauna Heater; the Drop 9 was $1,751 at both; the Cilindro PC90E was $1,318 at both; the KIP60B was $1,195 at both and $1,327.78 at a third dealer. Select Saunas was not beaten on a single heater I checked. The one real gap was the UKU Local controller — $859 there against $1,062 at three other dealers, unusual enough that I’d treat it as possibly temporary. If you find a lower price elsewhere, buy it there; I’d rather you trusted the arithmetic in this article than the link in it.

One more line item before you pick a brand. Heating elements are the consumable part of any sauna heater. Harvia’s US warranty covers them for 1 year, with 5 years on other heating components, non-transferable to a second owner. HUUM’s manual says five years and then carves them out: “Warranty does not cover heating elements. They are considered as consumable parts.” One year against zero. Drop elements are $88 (1500 W) and $109 (2000 W), so it’s a low-hundreds job rather than a disaster — but neither company covers the part most likely to fail past year one.

What the Electrician Actually Costs

This is where sauna budgets go wrong, and it’s usually a bigger line item than the gap between these two brands. Every heater here needs a dedicated 240 V circuit, hardwired, with no other loads on it. From the manufacturers’ own tables:

The jump from 6 kW to 9 kW is not small. You go from 10 AWG to 8 AWG copper and from a 30 A breaker to a 50 A one. Over a 60-foot run to a backyard build that’s a real materials cost, and it’s the point where a half-full panel becomes a subpanel.

Get the electrician’s quote before you order the heater. In my cold plunge chiller guide I make the same argument from the other direction: if there’s any chance you’ll put a cold plunge next to the sauna, run both circuits and the water line while the trench is open. Doing that job twice is the most expensive avoidable mistake in this hobby.

And the manufacturer’s own page may not help. Harvia’s en-US catalogue page for the Cilindro PC70, fetched 31 August 2026, lists its electrical options as “230V~ / 230V 3~ / 400V 3N~” and its fuse as “1 x 35 A,” with a supply cable sized in mm². Those are European specs on the manufacturer’s American storefront. The US figures live in the manual PDF, not on the page.

What Japan Does With These Same Heaters

I live in Japan, and how these two brands land here is instructive, because Japan runs at 200 V — the lowest mains voltage of any developed market — and everything above gets stress-tested by it.

First, context. Traditional Japanese commercial saunas are overwhelmingly gas-fired or far-infrared, run dry and hot, with a mizuburo cold bath beside them. The Finnish electric stove you can pour water on is a recent import, which is why Harvia set up a Japanese subsidiary, Harvia Japan K.K. in Akasaka, Tokyo, with a PSE-certified 200 V line rather than shipping European stock.

Second, the numbers, all from harvia.jp, checked 31 August and again on 14 September 2026. Japanese prices include 10% consumption tax; on the KIP and Cilindro models they also include the CX45J controller, power unit, temperature sensor and stones in the box, while The Wall has its controls on the heater and ships with stones only. US prices exclude sales tax and are heater-only unless noted. Conversions at ¥154.04 to the dollar, the ECB reference rate of 11 September 2026.

Those yen prices are two weeks old and they are all new. When I first pulled this table on 31 August the same four heaters listed at ¥566,720, ¥616,000, ¥806,960 and ¥369,600. Between then and 14 September Harvia Japan reset its list: +20% on the KIP and Cilindro lines and +25% on The Wall, and the KIP and Cilindro pages gained a second, dearer “FENIX Wi-Fi” configuration (¥792,000 and ¥1,078,000) that wasn’t offered at all in the archived version of those pages. Specs, room ranges and included accessories are unchanged — only the money moved. The US prices in the right-hand column did not move by a dollar over the same fortnight. Treat any Japanese figure you read anywhere, including this one, as a snapshot.

Look at the kilowatts before the yen. Harvia’s Japanese KIP 6 is 5.5 kW and its KIP 8 is 7.4 kW, against 6 and 8 in the US catalogue, with the room ranges shrinking to match. An arithmetic curiosity I’ll flag without claiming to explain it: 6 × (200 ÷ 208)² = 5.55, and 8 × (200 ÷ 208)² = 7.40. Both Japanese figures are exactly what US 208 V–rated elements would deliver at 200 V. Suggestive, not proof — Harvia doesn’t state it, and The Wall SW60 stays a full 6 kW here, so at least one product uses genuinely different elements. I’m showing the sum, not the cause.

Third, the part Americans find hardest to believe: a 6 kW sauna heater is roughly the entire electrical capacity of a Japanese home. TEPCO’s standard residential tariff, Juryo Dento B, caps the contracted supply at 60 amps, and its own page states that anything above 60 A must move to the commercial Juryo Dento C tariff, where “1 kVA corresponds to 10 A.” Sixty amps on a 100/200 V single-phase three-wire service is 6 kVA. A 5.5 kW heater draws 27.5 A at 200 V — nearly half of everything the house may draw, before the air conditioner, the induction hob or the rice cooker. Compare a standard American 200 A, 240 V panel: 48 kVA, into which a 9 kW heater disappears without comment. Home saunas are a normal purchase in Ohio and an engineering project in Tokyo for reasons that have less to do with culture than with the size of the incoming service.

HUUM is here too, through specialist importers, at 200 V — the Drop 9 at 6.4 kW, the Steel 6 at 4.5 kW. None publish a price; every listing says otoiawase kudasai, “please enquire.” Harvia publishes a full price list.

My Picks, By Situation

Small-to-medium insulated room, no glass wall, and you’d rather spend the money on cedar — Harvia KIP60B, $1,195. Six kilowatts, thermostat and timer built into the box, 25 A on a 30 A circuit, 170–300 ft³ per Harvia’s own manual. Add one $79 box of stones and you’re done: no controller, no wall panel, no sensor cable. It isn’t a beautiful heater. It’s the correct one for a lot of builds, and the cheapest legitimate path from “framed room” to “90°C.” See the KIP60B at Select Saunas

Same room, but the sauna is a design object and you want long, soft löyly — HUUM Drop 6, $1,506 plus $859 for the UKU Local. That’s $1,447 more all-in than the Harvia, and what it buys is 55 kg of stone against roughly 20 kg, a 24 lb wall-mounted shell, a Red Dot–winning shape and an app if you step up to the Wi-Fi UKU. The extra thermal mass is a real physical difference, not marketing: more hot rock means more steam per ladle and a gentler recovery between pours. Build it for 9 m³, not 10. See the Drop 6 at Select Saunas

Big room, or a glass front, or both — 9 kW, and check your voltage first. On 240 V the Harvia Cilindro PC90E at $1,318 is the value play (add a Xenio controller) and the HUUM Drop 9 at $1,751 is the design play; both want 37.5 A on a 50 A breaker with 8 AWG. On 208 V, neither is a 9 kW heater — the Drop becomes 6.75 kW rated to 11 m³, so size as though you bought a 7 kW. See the Drop 9 at Select Saunas

Replacing a dead heater in an existing room — start at the breaker you already have. If it’s a 30 A, you’re choosing between 4.5 and 6 kW, full stop. Upgrading to 50 A means new wire from the panel, and at that point the heater is the cheap part of the project.

The Bottom Line

It comes down to a sentence: Harvia sells you a working sauna for the price of the box; HUUM sells you a beautiful box that needs an $859 accessory before it does anything. Both are Nordic, both properly certified, both publish more honest documentation than most of this industry. Neither covers the heating elements past year one.

Before you choose, do three things in order. Measure the room and run it through Harvia’s own formula — W × H × D in feet, plus 53 for a glass door, plus 3.94 per square foot of glass or tile, divided by 50.4. Put a meter on your supply and find out whether it reads 240 or 208. Then get the electrician’s quote.

Do those three and the heater choice mostly makes itself. Skip them and you’ll own a very handsome stainless box that takes three hours to reach 75°C.

Sources

All fetched 31 August 2026 unless noted. HTTP status shown for each. Prices are the actual selling price on the day and will change.

• HUUM, “Electric Sauna Heater DROP” — huumsauna.com/product/drop-electric-sauna-heater/ (HTTP 200): Drop 4/6/7/9 at 4.5/6/7.5/9 kW; steam room min–max 3–7, 5–9, 7–11, 8–13 m³; rock capacity 55 kg all models; 240 V 2~; fuses 30/30/40/50 A; 10/10/8/8 AWG; 590 × 390 × 335 mm; 11–12 kg; UKU control system required.
• HUUM, “DROP USA User Manual” PDF — cdn.shopify.com/s/files/1/0676/0254/6902/files/DROP_USA_User_Manual.pdf (HTTP 200): Table 2 (240 V) 106–247 / 177–353 / 247–424 / 282–530 ft³ = 3–7 / 5–10 / 7–12 / 8–15 m³; Table 3 (208 V) outputs 3.4 / 4.5 / 5.6 / 6.75 kW and rooms 2.5–5.5 / 4–8 / 5–9 / 6–11 m³; “an additional volume of 53 ft³ (1,5 m³) should be added … for each such square meter of the wall”; “the producer’s warranty guarantee is invalid if the heater and sauna room have been dimensioned incorrectly”; total loaded weight 143.3 lb (65 kg); warranty five years, “Warranty does not cover heating elements. They are considered as consumable parts.”
• HUUM EU, same product — huum.eu/product/drop-electric-sauna-heater/ (HTTP 200): Drop 9 rated 8.5 kW at 230 V, 8–13 m³, 40 A single-phase.
• HUUM, “Electric Sauna Heater HIVE” — huumsauna.com/product/hive-electric-sauna-heater/ (HTTP 200): 12/15/18 kW, 12–18 / 15–23 / 18–28 m³, 250 kg stone, 240 V 2~.
• Harvia sauna calculator — harvia.com/en-US/sauna/saunas/sauna-calculator/ (HTTP 200). Coefficients read directly from the page’s own JavaScript on 31 August 2026: volume × 1.5 if log, + 1.5 m³ for a glass door, + 1.2 m³ per m² of uninsulated wall, then kW = 0.7 × volume, clamped between 2.3 and 30 kW.
• Harvia, “KIP Owner’s/Operator’s Manual” PDF — cdn.shopify.com/s/files/1/0676/0254/6902/files/Harvia_KIP_IOM_2022.pdf (HTTP 200): Table 1 room volumes 84–130 / 100–210 / 170–300 / 250–425 ft³ for 3.0 / 4.5 / 6.0 / 8.0 kW; 240 V 1-phase amps 12.5 / 18.8 / 25.0 / 33.3 with wire 12 / 10 / 10 / 8 AWG; 208 V 3-phase variants listed separately; minimum sauna height 6’2” USA, 6’5” Canada.
• Harvia, Cilindro PC70 en-US product page — harvia.com/en-US/products/HPC700400/cilindro-pc70-68-kw-steel (HTTP 200): room volume 212–353 ft³; stone amount 176.4 lb; net weight 22.1 lb; electrical options listed as 230V~ / 230V 3~ / 400V 3N~, fuse 1 × 35 A at 230 V 1N~.
• Harvia-branded “Sizing Your Harvia 2023” PDF, distributed by a US dealer — cdn.shopify.com/s/files/1/0751/2834/0763/files/Sizing-Your-Harvia-2023_a76729f3-6700-44ae-b69a-b49e03d0a4fb.pdf (HTTP 200): “For each square foot of cold surface materials (excluding door), an additional 2 cubic feet must be added.”
• Almost Heaven Saunas (Harvia Group’s US brand), warranty page — almostheaven.com/pages/warranty (HTTP 200): “Your Harvia heater comes with a 1-year warranty on the heating elements (coils) and a 5-year warranty on the other heating components”; warranty non-transferable.
• Select Saunas product pages and catalogue JSON — selectsaunas.com (HTTP 200), all prices and spec boxes captured 31 August 2026 and re-read from the store’s own catalogue JSON on 14 September 2026, when every price below was unchanged to the dollar and every item was in stock: Drop 4.5 $1,334 / Drop 6 $1,506 / Drop 7.5 $1,672 / Drop 9 $1,751; Cliff 6 $2,347 / Cliff 9 $2,638; Hive Mini 6 $2,502 / Hive Mini 9 $2,657; Steel 6 $2,033; UKU Local $859, UKU Wi-Fi $1,277, UKU Glass Wi-Fi $1,774; KIP45B $1,155 / KIP60B $1,195 / KIP80B $1,258; KIP60W $1,010; Cilindro PC60E $1,181 / PC90E $1,318 / PC60 $1,427 / PC90 $1,625; Virta HL90E $2,143; The Wall SW60 $1,548 / SW80 $1,557; Xenio CX30 $973, CX45 $1,292, CX170 $1,035; Harvia stones AC3000 20 kg $79; HUUM olivine 33 lb $89; HUUM elements $88 (1500 W) and $109 (2000 W). Drop 9 page prose “247 to 424 ft³ / 7 to 12 m³” against its own spec box “282 / 530 CF”; Drop 7.5 spec box “230 / 441 CF” against the comparison table “247 - 424” on the same page; Hive Mini 9 spec box “282 / 530” against comparison table “317 - 530”; Cilindro PC60E “Nominal Amps 37.5 Amps”; all Drop pages “132 lbs / 60 kg” stone capacity.
• Comparison prices the same day: The Sauna Heater — thesaunaheater.com (HTTP 200): Drop 6 $1,506, Drop 9 $1,751, KIP60B $1,195, Cilindro PC90E $1,318. Sauna Heater Supply — saunaheatersupply.com (HTTP 200): KIP60B $1,327.78, UKU Local black $1,062. Topture and Sun Valley Saunas: UKU Local $1,062.
• US distributor datasheets linked from retailer spec tabs — nine PDF URLs under bathingbrands.com/sites/default/files/ covering Harvia KIP60B, Cilindro PC90E and Virta HL90E datasheets, Harvia and HUUM stone requirements, both sizing sheets, and both warranty sheets: all nine returned HTTP 404 on 31 August 2026, although bathingbrands.com itself returns HTTP 200.
• HARVIA JAPAN — harvia.jp/products/kip60e/, /kip80e/, /pc60e/, /wall6/ (all HTTP 200), re-fetched 14 September 2026: KIP60E 5.5 kW, 4–7 m³, single-phase 200 V, 25 kg stone max, ¥682,000 incl. tax (FENIX Wi-Fi version ¥792,000); KIP80E 7.4 kW, 6–11 m³, ¥737,000 (FENIX ¥847,000); PC60E 5.5 kW, 5.5–9.1 m³, 80 kg stone, ¥968,000 (FENIX ¥1,078,000); SW60 6 kW, 5–8 m³, 15 kg stone, ¥462,000. Standard accessories: CX45J controller, power unit, room temperature sensor, sauna stones and heater guard on KIP60E/KIP80E; CX45J controller, power unit, room temperature sensor and stones on PC60E; sauna stones only on SW60, which has a built-in dial controller.
• The same four pages on 31 August 2026 listed ¥566,720 / ¥616,000 / ¥806,960 / ¥369,600, with no FENIX Wi-Fi option. Independently corroborated by the Internet Archive: web.archive.org/web/20260617163819/https://harvia.jp/products/kip60e/ shows ¥566,720 and …/20260529061741/https://harvia.jp/products/wall6/ shows ¥369,600, and neither snapshot contains the string “FENIX”.
• HUUM Japan listings via a specialist importer — kimoty.com/products/stove/huum-194103/ and /huum-194115/ (both HTTP 200): “DROP 9 Electric Sauna Stove, single-phase 200 V, 6.4 kW” (title translated), room 6–10 m³, 40 A breaker, 55 kg stone, total mounted weight 65 kg; “STEEL 6 Electric Sauna Stove, single-phase 200 V, 4.5 kW”, room 4–7 m³. Prices shown as “otoiawase kudasai” (enquire).
• TEPCO Energy Partner, Juryo Dento B / C tariff page — www.tepco.co.jp/ep/private/plan/old01.html (HTTP 200): Juryo Dento B contracted at 10–60 A, with the page stating that contracts above 60 A must use Juryo Dento C; Juryo Dento C starts at 6 kVA and states that 1 kVA corresponds to 10 A; 60 A monthly base charge ¥1,870.50 incl. tax.
• USD/JPY 154.04, 11 September 2026 (ECB reference rate via Frankfurter API), the latest published rate on 14 September. The 31 August version of this article used 159.68 (28 August 2026); the yen strengthened 3.5% in between, so both the yen prices and the rate changed, and both were re-taken on the same day rather than one being updated against the other.