A sauna heater buyer asks how long the warranty on the heater is, whether the manufacturer helps size the heater for the sauna and whether spare parts can be bought directly from the manufacturer. These decide 50 points out of 100.
harvia.com · Harvia (Harvia Oyj, business ID (Y-tunnus) 2612169-5) is a listed Finnish sauna heater and sauna manufacturer based in Muurame, one of the world's leading players in the field. The site shows business ID (Y-tunnus) 4396556-1 (the group's operating company). The heaters are sold through resellers.
66.2SCORE
Electric sauna heater warranty100
Help with sizing a sauna heater100
Availability of spare parts0
Basic metrics · 60.3
Digital quality80
Transparency63
Reachability25
AI quality score62
+ A wide and clearly organised selection: electric, wood-burning and combi sauna heaters, plus control units and sauna stones as their own sections
Basic metrics: 60.3, rank 3 · ▲ 2 places
– Availability of spare parts: A spare parts shop is mentioned in the product page menu, but no quotable text could be read from its page, so the ordering method was not scored.
mondex.fi · Mondex (Mondex Oy, business ID (Y-tunnus) 1769513-6) is a Finnish sauna stove manufacturer whose range covers wood-burning, electric, floor, wall and soapstone stoves as well as WiFi-controlled models.
58.7SCORE
Electric sauna heater warranty0
Help with sizing a sauna heater100
Availability of spare parts100
Basic metrics · 61.4
Digital quality81
Transparency47
Reachability55
AI quality score60
+ A sauna heater calculator helps size the right power class, and products state the output (kW) and stone capacity (60-100 kg)
Basic metrics: 61.4, rank 2 · no change
– Electric sauna heater warranty: The warranty terms are on the page mondex.fi/materiaali/mondex-takuuehdot-2026 only as an image file (PNG) that cannot be read as text, and the warranty period is not stated on the product page or front page.
narvi.fi · Narvi (Narvi Oy, business ID (Y-tunnus) 2087049-2) is a Finnish manufacturer of sauna heaters and masonry-set cooking pots (muuripata), with its own consumer online shop (kauppa.narvi.fi) with heater models and euro prices.
58.7SCORE
Electric sauna heater warranty50
Help with sizing a sauna heater100
Availability of spare parts0
Basic metrics · 67.4
Digital quality81
Transparency74
Reachability30
AI quality score75
+ A working consumer online shop (kauppa.narvi.fi) where the sauna heater models (Aitokiuas 47/57/68, Narvi NC/NM, Kota) and euro prices are visible
Basic metrics: 67.4, rank 1 · ▼ 2 places
– Availability of spare parts: How to order spare parts was not found: narvi.fi's sitemap has no spare parts pages, and the product page and warranty terms do not mention ordering directly.
helo.fi · Helo (Sauna360 Oy, business ID (Y-tunnus) 1574558-2) is a Finnish sauna heater brand that belongs to the TyloHelo group. Sauna360 Oy also owns the Tylö and Kastor brands (dedup: counted once). Sales take place through a network of resellers.
50.2SCORE
Electric sauna heater warranty50
Help with sizing a sauna heater50
Availability of spare parts50
Basic metrics · 50.5
Digital quality66
Transparency34
Reachability60
AI quality score42
+ The selection is comprehensive: electric sauna heaters, wood-burning stoves, steam and infrared as their own product groups
tulikivi.fi · Tulikivi (Tulikivi Oyj, business ID (Y-tunnus) 0350080-1) is a listed soapstone product manufacturer from Juuka that makes heat-retaining soapstone sauna heaters as well as wood-burning and electric sauna heaters.
28.5SCORE
Electric sauna heater warranty0
Help with sizing a sauna heater0
Availability of spare parts0
Basic metrics · 57.0
Digital quality69
Transparency61
Reachability30
AI quality score61
+ Sauna heater range clearly divided: collection heaters, wood-burning heaters, electric heaters and communal heaters, plus soapstone as a theme of its own
Basic metrics: 57.0, rank 4 · ▼ 1 place
– Electric sauna heater warranty: the product warranty page covers fireplaces and hearths, and the warranty period for electric sauna heaters is not specified.
ikikiuas.fi · IKI-Kiuas (IKI-Kiuas Oy, business ID (Y-tunnus) 2042076-6) is a Finnish maker of handmade sauna heaters, known for their large stone capacity; sales take place through a nationwide network of resellers.
25.4SCORE
Electric sauna heater warranty0
Help with sizing a sauna heater0
Availability of spare parts0
Basic metrics · 50.7
Digital quality56
Transparency39
Reachability60
AI quality score51
+ A distinguishing feature of the sauna stoves is a large quantity of stones (for example 120-260 kg), which is described on product pages as justification for the quality of the sauna steam
Basic metrics: 50.7, rank 5 · ▼ 1 place
– Electric sauna heater warranty: The warranty period is not mentioned on the front page (ikikiuas.fi) or the FAQ page (ikikiuas.com/faq); no warranty page was found in the sitemap.
QUESTIONHow long is the warranty on an electric sauna heater for home use?
Warranty period in years of the electric sauna heater for private use. If a longer warranty requires registration, the figure includes it and this is stated in the additional information.
3 years or more = 100 points, 1 year or less = 0, in between directly proportional.
22 p
Help with sizing a sauna heater
QUESTIONDoes the manufacturer help choose a sauna stove of the right output for the sauna?
Calculator for sauna volume and power requirement on the manufacturer's page.
Calculator on the page = 100 points, only calculation instructions as text = 50, neither = 0.
14 p
Availability of spare parts
QUESTIONCan spare parts be bought directly from the manufacturer?
Manufacturer's own spare parts online shop or other direct ordering method.
Own spare parts shop or direct delivery from the manufacturer = 100 points, only via a reseller = 50, no information = 0.
14 p
Basic metrics
Digital quality, transparency, reachability and AI quality score
Basic metrics × 0.5
50 p
Notes
The comparison covers six sauna heater manufacturers and their own websites. Heater prices were not scored because none of the manufacturers publishes consumer prices on their own websites: prices are with the resellers.
Tulikivi's warranty page concerns fireplaces and hearths, and the warranty period of an electric sauna heater is not specified. Mondex's warranty terms are only an image file. Such information is empty in value and gets 0 points for that motive.
About this comparison
We scored 6 Finnish sauna heater manufacturers on 23 metrics. The most important question for the buyer: are the heater's price, output, warranty, materials and range already visible on the website, or do they only come out through a quote request or from a retailer?
The sauna stove is the heart of the sauna and a long-lasting purchase, but manufacturers' websites tell very differently about what the buyer gets. Some sell stoves in their own online shop with model-specific prices, some help size the right output with a stove calculator, and some leave both the price and the warranty behind a quote request or a retailer. We compared Finnish sauna stove manufacturers on how openly price, output, material, warranty and range are shown online before the purchase decision.
What transparency means in this category
Price of a sauna heater, price examples or online shop price publicly shown (not only a quote request) (24), heater output (kW) or sauna size sizing guide/calculator stated (14), warranty (in years) or warranty terms stated on the site (12), material and construction details shown (steel, cast iron, soapstone, amount of stones) (10), heater range stated (electric, wood-burning, combi/steam heaters) (10), resellers or stores listed or searchable (8), installation, electrical work or authorised installer stated (6), delivery or online shop delivery terms stated (6), business ID (Y-tunnus) or operating company shown on the site (6), contact details shown (phone or e-mail) (4)
How to read the comparison correctly: Half of the points come from buyer's questions, i.e. things the buyer finds out before deciding. The other half measures how openly the company publishes its prices, terms and contact details. Clear differences in points indicate a genuine difference: one tells you the price immediately, another only after logging in. Close scores should not be read as a ranking order, because every measurement has a margin of variation. The measurement accuracy and the full calculation formula are open in the methodology.
Customer experience is brought into the assessment separately. We also collect customer feedback and customer experiences about companies through separate surveys. The survey results will be added to the overall assessment later.
For a sauna heater buyer, the decisive factors are the right output relative to the size of the sauna, the material (steel, cast iron or soapstone) and the warranty, not price alone.
Some manufacturers sell sauna heaters in their own web shop with prices listed, others disclose the price only through a retailer.
Electric, wood-fired and combi sauna heaters suit different needs, so transparency of the selection and sizing help is essential for the buyer.
Comparison guide
What to consider in the comparison
Choose the sauna heater's output according to the size of the sauna: a heater that is too small will not heat properly and one that is too large wastes energy. A heater calculator or an output class table helps with sizing.
The material affects the löyly (sauna steam) and durability: a steel stove heats up quickly, cast iron and soapstone store heat for longer but heat up more slowly.
An electric sauna heater usually requires connection by an electrician, so the installation cost should be taken into account in addition to the price.
Many manufacturers sell sauna heaters through resellers, so the price is missing from the website and the final price is only revealed in the shop.
Warranty length and terms vary, and the warranty often requires warranty registration or installation by an authorised installer.
How Suomen Paras assesses and scores
Every company is measured with the same public formula: half of the points come from buyer's questions and half from basic metrics, which have four pillars: technical quality, transparency, reachability and AI quality score. Ranking cannot be bought, and you can see the origin of each point on the company's profile. Read the full methodology →
Expert tips
See whether the manufacturer sells sauna heaters in its own online shop with prices. That gives a price range without a request for quotation, although the retailer's price may differ.
Size the sauna heater according to the cubic volume of the sauna: use the manufacturer's heater calculator or power class table before choosing a model.
Compare the material to your need: steel for fast heating, cast iron or soapstone for soft and long-lasting löyly.
Check the length and terms of the warranty, and whether the warranty requires warranty registration or authorised installation.
Remember the installation cost of an electric sauna heater: the connection must be done by a qualified electrician, which is added to the heater's price.
Frequently asked questions
Why is the price of a sauna heater not shown on many manufacturers' websites?
Some manufacturers sell sauna heaters through a network of resellers, in which case the final price is set by the shop. Some still show model-specific prices in their own online shop, so the buyer gets a price range without a separate quote request.
How do I choose a sauna heater of the right output?
Output is chosen according to the cubic volume of the sauna. Uninsulated surfaces, such as glass or stone, increase the power requirement. Many manufacturers offer a heater calculator or a power class table that recommends a suitable number of kilowatts based on the sauna size.
What is the difference between steel, cast iron and soapstone sauna heaters?
Steel sauna heaters warm up quickly and are light, but they also cool down quickly. Cast iron and soapstone store heat for longer and give a softer steam, but they heat up more slowly and are heavier and often more expensive.
Does an electric sauna heater need professional installation?
Connecting an electric sauna heater to the mains must be done by an electrical professional. A wood-burning heater can be installed yourself, but the chimney and safety distances must meet the regulations. Installation cost should be considered in addition to the price of the heater.
Are you listed and would like to rank higher?
The free pre-analysis shows every item where your company loses points and which rank fixing it is enough for. The paid analysis shows what the items are and how to fix them.
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