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Export Manager of Narvi Sauna Stoves takes us through a heat storing sauna stove experience

The Factory tour

Lets talk a little bit about Narvi. Of the bigger sauna heater manufacturers, we are the only one designing and manufacturing all our products in Finland. With about 70 employees, Narvi grows by sticking to their plan. Narvi is very proud of their enameled heaters that are extremely durable and easy to take care of. And Narvi is an innovator. For example the smoke channels of the Narvi NC make the heater the most eco-friendly in the world. VTT tests the heaters in Finland, and Narvi NC 16 scored 0.07 % in carbon monoxide emissions, when the minimum level is 1 %.  At their factory, real people and sauna lovers are the ones developing and manufacturing their heaters. They are proud about every unit that leaves our place, and it shows.

With Jesse, Narvi Sauna stove factory in Western Finland

Wood burning is more popular in Canada. The Baltic countries are strong in the wood burning category.

20% of Narvi sales are outside of Finland.

Wood heat vs. Electric heat

Cool down is a critically important part of sauna

Foreigners who love the sauna have had to work hard to enjoy sauna.

Log sauna building vs. a stick frame sauna building.

25 countries. Does not sell (yet!) in the US.

The private sauna session with Jesse

Our sauna session together at a lakeside historic hunting camp in Western Finland was a private sauna experience, in a very old sauna building, fueled by a wood burning heat Storing AK95.

Chilling out with Jessi, Narvi, between sauna rounds

We learn how a heat storing sauna stove operates. Closing the smoke valve. Insulated heat chamber. This stove allows for a classic smoke sauna (savusauna) experience. A few hundred kilos of stones. At least 700 pounds of rocks.

No direct contact with the rocks. Continuous burning stoves require lots of oxygen. Oxygen circulates better in a wood fired sauna. Ventilation is one of the most important things in a sauna.

The noise tells quite much. The slower the heat comes.

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10 thoughts on “Export Manager of Narvi Sauna Stoves takes us through a heat storing sauna stove experience”

  1. Thank you for sending me sauna info I live in Yukon Canada I have built 4 out door saunas and wood stoves. I am very interested in a real finish wood heater.. bye for now

  2. Hi there. New follower here. Your contact section said to leave a message on a Blog post for quickest response.

    I am having a Finnish style sauna constructed on my property in Evergreen, CO. It is a kit, the brand is Almost Heaven (Appalachian Model). I have no interest or loyalty to that brand, it is just what I chose to go with. Wondering if you wanted to do any kind of feature on it or the build out. Space clearing, deck build (it will be on a platform), Sauna construction, and post use. It is truly a lovely space and area, we are on the North Slope of Evergreen Mountain. Let me know if that is of interest to you.

    Thanks! Will be following your site anyway.

    JB

  3. Hi Jon:

    Sounds like a wonderful project. We welcome guest posts, and i’ll email you separately. I can almost feel the freshness of your mountain vista, chilling out in your garden all misty wet with rain.

  4. Hi Matt:

    Narvi is not yet available in the US, but I’ve been trying to get Jesse over to US, and after Corona, mebbe we can get him over and he can check a few in his luggage. Should we get one on the list for you?

  5. Hello Glenn,
    Thank you for all you are doing to support us all in our passion for sauna building.
    I have been looking at these Finnish sauna stoves and also seen your endorsements for the Kuuma.
    I like the idea if increased thermal mass (lots of stone)
    What have you seen in regards to adding thick stone walls around a Kuuma or other ways of increasing thermal heat storage to achieve more of the effect of a Narvi from a Kuuma.
    I would appreciate your guidance in terms of balancing being practical and striving for the best experience.

  6. Hi Matt:

    I have seen (and felt) adding stone walls around a Kuuma to increase lämpömassa.

    It is important to isolate this mass in its own thermal envelope (ie insulated) and to think about the density.

    Also, and you got it right, balancing the amount is key. Stove surround mass is like ganja edibles: too little and you won’t feel it, and too much will take too long to take effect and then it’ll be too late.

  7. Thank you for your reply Glenn,

    Perhaps I have been thinking too hard over this project but you provide a lot of food for thought.

    I have seen the Finn stoves with a very large amount of stone in an insulated cylinder but I’m not exactly sure how to make this kind of insulated envelope work with a Kuuma?

    Are you saying that the mass needs to be enveloped so you don’t lose heat to the cold outside or to release the heat slowly or other reasons?

    My current thinking on my 8.5×12 insulated pad is to have the following wall construction from the inside:

    – 2×6 t&g western red cedar (somehow I bought this material cheaper than any other cedar I could find)
    – 1×4 rough sewn vertical strapping (I understand that radiant barrier requires min. 3/4 air gap to work optimally)
    – radiant barrier film > 2×6 walls with roxul insulation
    – 2″ SM rigid insulation > strapping
    – Steel siding. I could replace the interior cedar with thick flagstone that I have in surplus.

    This gives me a 7×7 hot room and a 3×7 change room. I have a larger building adjacent for a warm relax room so I think a small change room will be okay. A fibreglass aquaculture tank for a cold tank.

    My issues with a Kuuma are as follows (perhaps you can add some insights)?

    1) Not enough mass – Have you aver added stone around the chimney pipe? I see this in many sauna stove designs but that pipe must be uninsulated and reinforced? Or welding up a frame to put stone directly around the fire box? When I think of the Finn stoves (or a masonry stove/kachelofen) and having less exposed steel and more stone, I imagine a much better experience and heat retention.

    2) Why don’t these stoves have a cold air intake to pull fresh air from outside into the stove? It doesn’t make sense for a premium stove to send hot air out and pulling in cold air into a hot room from vents vis an air vacuum. I am uncomfortable buying any wood stove that doesn’t have a cold air intake.

    3) I’m in Canada so the import/shipping is higher. Well worth it if buying the right unit. I love that the Kuuma is built to last and probably very well designed for combustion.

    If I go with the Kuuma and trying to add some mass somehow, Small or medium stove for a 7′ x7′ x8″high hot room? A small works by spec. but is medium better or worse?

    I assume the following options are highly recommended > shielding on 3 sides, ash pan, glass door?

    Many Thanks!

  8. Matt, for a 7x7x8 hot room, assuming well insulated and a changing room, then go with a small Kuuma.

    And for your other questions, the stone surround that you will build, if isolated from the wall will be a good lämpömassa generator. If your surround is part of the wall, it’s not good as it will be a heat sink, sucking heat into the stone and out into the cool Canadian air.

    Too much stone mass is not good as your hot room will take too long to get up to serving temp.

    Please read about venting on this website. There’s a lot to it, and given your diligence, i’m pretty confident you’ll get it right.

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